Pub Date : 2024-10-05DOI: 10.1016/j.stress.2024.100630
Bilal Ahmad Mir , Ritu Kumari , Gurmeen Rakhra , Parul Parihar , Rachana Singh , Aman Deep Raju , Prabhat Kumar Srivastava , Sheo Mohan Prasad , Richa Singh , Shefali Gulliya
Abiotic stress, which includes salinity, drought, heat, and cold, as well as their many combinations, severely reduces crop productivity across the globe each year. Considering the intensified worldwide climatic changes, the effects of these conditions on plant productivity become increasingly more concerning. Sulfur is essential for several metabolic processes, including the organization and control of electron transport. Reductive assimilation and integration into cysteine and methionine, sulfate absorption, and reductive assimilation and integration are the key methods that oxidized and reduced forms of organically bound sulfur get to their different roles. Protective compounds with sulfur, such as glutathione, phytochelatins, S-rich proteins, and several secondary metabolites, are essential for plants to survive abiotic stress, such as dihydroasparagusic acid, hydrogen sulfide, etc. This thorough review covered the regulation of sulfur at the protein and gene transcription levels in response to abiotic stress.
非生物胁迫,包括盐度、干旱、高温和低温,以及它们的多种组合,每年都会严重降低全球作物的产量。考虑到全球气候变化加剧,这些条件对植物生产力的影响越来越令人担忧。硫对于多个代谢过程至关重要,包括电子传输的组织和控制。半胱氨酸和蛋氨酸的还原同化和整合、硫酸盐吸收以及还原同化和整合是氧化型和还原型有机结合硫发挥不同作用的主要方法。含硫的保护性化合物,如谷胱甘肽、植物螯合素、富含 S 的蛋白质和一些次生代谢产物,是植物在二氢天冬酰胺酸、硫化氢等非生物胁迫下生存所必需的。这篇综述深入探讨了硫在蛋白质和基因转录水平上对非生物胁迫的调控。
{"title":"Sulfur assimilation and regulation of abiotic stress via OMICS","authors":"Bilal Ahmad Mir , Ritu Kumari , Gurmeen Rakhra , Parul Parihar , Rachana Singh , Aman Deep Raju , Prabhat Kumar Srivastava , Sheo Mohan Prasad , Richa Singh , Shefali Gulliya","doi":"10.1016/j.stress.2024.100630","DOIUrl":"10.1016/j.stress.2024.100630","url":null,"abstract":"<div><div>Abiotic stress, which includes salinity, drought, heat, and cold, as well as their many combinations, severely reduces crop productivity across the globe each year. Considering the intensified worldwide climatic changes, the effects of these conditions on plant productivity become increasingly more concerning. Sulfur is essential for several metabolic processes, including the organization and control of electron transport. Reductive assimilation and integration into cysteine and methionine, sulfate absorption, and reductive assimilation and integration are the key methods that oxidized and reduced forms of organically bound sulfur get to their different roles. Protective compounds with sulfur, such as glutathione, phytochelatins, S-rich proteins, and several secondary metabolites, are essential for plants to survive abiotic stress, such as dihydroasparagusic acid, hydrogen sulfide, etc. This thorough review covered the regulation of sulfur at the protein and gene transcription levels in response to abiotic stress.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100630"},"PeriodicalIF":6.8,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444881","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rice (Oryza sativa) is a highly significant cereal crop on a global scale. Crop plants usually respond to the biotic challenges with altered metabolic composition and physiological perturbations. We have deciphered altered metabolite composition, modulated metabolic pathways and identified metabolite biomarkers in M. graminicola-challenged susceptible rice variety HUR-917 using NMR (Nuclear magnetic resonance) mass spectrophotometry-based metabolomics. In this study, we conducted a comprehensive analysis of the metabolome of susceptible rice plants challenged with the pathogen M. graminicola to unravel complex metabolic changes, identify key biosynthetic pathways, and pinpoint metabolite biomarkers. Through statistical analysis, we identified 100 significant metabolites, with 48 upregulated and 52 downregulated metabolites at a fold change threshold of ≥ 2.0. Multivariate analyses, including Partial Least Squares Discriminant Analysis (PLS-DA) and Orthogonal Partial Least Squares Discriminant Analysis (OPLS-DA), revealed clear discrimination between control and treated samples, with high predictive ability for annotated discriminant metabolites. Pathway enrichment analysis unveiled prominent involvement of metabolic pathways such as nicotine and nicotinamide metabolism and valine, leucine, and isoleucine degradation. Furthermore, putatively annotated biomarkers identified through multivariate ROC curve analysis included metabolites like Thymol, Glycylproline, N-acetylglutamate, and Betaine, among others. These biomarkers, along with pathway enrichment results, underscored the intricate defense mechanisms employed by rice plants in response to M. graminicola infection. Notably, upregulated metabolites such as betaines, histamine, and 5-hydroxytryptophan were implicated in plant defense responses, while downregulated metabolites like thymol and N-acetylglutamate may contribute to increased susceptibility to nematode infection. Nicotinic acid downregulation is crucial in enhanced susceptibility of rice against M. graminicola. Pathway mapping highlighted the enrichment of crucial metabolic pathways involved in primary and secondary metabolism, emphasizing the shift from growth-related processes to defense-related responses like nicotine and nicotinamide metabolism under stress conditions. Overall, our findings provide valuable insights into the metabolic dynamics of rice plants during pathogen invasion, identifying potential biomarkers and elucidating key metabolic pathways involved in plant defense mechanisms. This research contributes to a deeper understanding of plant-nematode interactions and holds implications for the development of effective strategies for root knot management in rice cultivation.
{"title":"Exploring the rice root metabolome to unveil key biomarkers under the stress of Meloidogyne graminicola","authors":"Vedant Gautam , Ravi Nagar , Pradeep Barai , Vibhootee Garg , Shreyashi Singh , Himanshu Singh , Shubham Patel , Mukesh , Ashish Kumar , R.K. Singh","doi":"10.1016/j.stress.2024.100620","DOIUrl":"10.1016/j.stress.2024.100620","url":null,"abstract":"<div><div>Rice (<em>Oryza sativa</em>) is a highly significant cereal crop on a global scale. Crop plants usually respond to the biotic challenges with altered metabolic composition and physiological perturbations. We have deciphered altered metabolite composition, modulated metabolic pathways and identified metabolite biomarkers in <em>M. graminicola</em>-challenged susceptible rice variety HUR-917 using NMR (Nuclear magnetic resonance) mass spectrophotometry-based metabolomics. In this study, we conducted a comprehensive analysis of the metabolome of susceptible rice plants challenged with the pathogen <em>M. graminicola</em> to unravel complex metabolic changes, identify key biosynthetic pathways, and pinpoint metabolite biomarkers. Through statistical analysis, we identified 100 significant metabolites, with 48 upregulated and 52 downregulated metabolites at a fold change threshold of ≥ 2.0. Multivariate analyses, including Partial Least Squares Discriminant Analysis (PLS-DA) and Orthogonal Partial Least Squares Discriminant Analysis (OPLS-DA), revealed clear discrimination between control and treated samples, with high predictive ability for annotated discriminant metabolites. Pathway enrichment analysis unveiled prominent involvement of metabolic pathways such as nicotine and nicotinamide metabolism and valine, leucine, and isoleucine degradation. Furthermore, putatively annotated biomarkers identified through multivariate ROC curve analysis included metabolites like Thymol, Glycylproline, N-acetylglutamate, and Betaine, among others. These biomarkers, along with pathway enrichment results, underscored the intricate defense mechanisms employed by rice plants in response to <em>M. graminicola</em> infection. Notably, upregulated metabolites such as betaines, histamine, and 5-hydroxytryptophan were implicated in plant defense responses, while downregulated metabolites like thymol and N-acetylglutamate may contribute to increased susceptibility to nematode infection. Nicotinic acid downregulation is crucial in enhanced susceptibility of rice against <em>M. graminicola</em>. Pathway mapping highlighted the enrichment of crucial metabolic pathways involved in primary and secondary metabolism, emphasizing the shift from growth-related processes to defense-related responses like nicotine and nicotinamide metabolism under stress conditions. Overall, our findings provide valuable insights into the metabolic dynamics of rice plants during pathogen invasion, identifying potential biomarkers and elucidating key metabolic pathways involved in plant defense mechanisms. This research contributes to a deeper understanding of plant-nematode interactions and holds implications for the development of effective strategies for root knot management in rice cultivation.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100620"},"PeriodicalIF":6.8,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-30DOI: 10.1016/j.stress.2024.100621
Shobana Narayanasamy, Sivakumar Uthandi
Increasing evidence implies that bacterial volatile organic compounds (bVOCs) play a significant role in plant-microbe interaction. Plant associated bacteria produces plant growth modulating volatiles elicits induced systemic tolerance (IST) in plants against a multitude of abiotic stress. Induction of IST and plant growth promotion by signatory bVOCs of Bacillus altitudinis FD48 against drought are reported in this study. The rice seedlings exposed to bVOCs blends of FD48 showed a one-fold increase in whole plant biomass and auxin content (3 µmol g-1 FW) under induced moisture stress. The effect of bVOCs highly depends on the inoculum load. Higher inoculum quantity (100 µL) is detrimental to plant growth. bVOCs produced by FD48 profiled at different growth intervals in GC–MS-ATD revealed a total of 40 bioactive compounds both under stress (PEG 6000) and non-stressed conditions. Interestingly, potential plant growth-promoting compounds such as 1-Hexanol, 2,3-butanediol, dimethyl disulfide, benzene, butanoic acid, pentadecane, and acetic acid are more pronounced. Few compounds produced under non-stress were found to increase during stress (example, 2,3-Butanediol, and acetic acid). This study unraveled the significant biosynthetic pathways induced by FD48 bVOC blends, such as pyruvate metabolism, tryptophan metabolism, sulfur metabolism, fatty acid biosynthesis, and ethanol degradation that anchors in abating moisture stress. Hence, it can be concluded that PGPB B. altitudinis FD48 produced bVOCs could be potential orchestrators of induced systemic tolerance in plants against moisture stress.
{"title":"Plant growth promoting signatory volatiles emitted by a drought-tolerant bacterium Bacillus altitudinis FD48 and its role in moisture stress alleviation in rice (Oryza sativa L.)","authors":"Shobana Narayanasamy, Sivakumar Uthandi","doi":"10.1016/j.stress.2024.100621","DOIUrl":"10.1016/j.stress.2024.100621","url":null,"abstract":"<div><div>Increasing evidence implies that bacterial volatile organic compounds (bVOCs) play a significant role in plant-microbe interaction. Plant associated bacteria produces plant growth modulating volatiles elicits induced systemic tolerance (IST) in plants against a multitude of abiotic stress. Induction of IST and plant growth promotion by signatory bVOCs of <em>Bacillus altitudinis</em> FD48 against drought are reported in this study. The rice seedlings exposed to bVOCs blends of FD48 showed a one-fold increase in whole plant biomass and auxin content (3 µmol g<sup>-1</sup> FW) under induced moisture stress. The effect of bVOCs highly depends on the inoculum load. Higher inoculum quantity (100 µL) is detrimental to plant growth. bVOCs produced by FD48 profiled at different growth intervals in GC–MS-ATD revealed a total of 40 bioactive compounds both under stress (PEG 6000) and non-stressed conditions. Interestingly, potential plant growth-promoting compounds such as 1-Hexanol, 2,3-butanediol, dimethyl disulfide, benzene, butanoic acid, pentadecane, and acetic acid are more pronounced. Few compounds produced under non-stress were found to increase during stress (example, 2,3-Butanediol, and acetic acid). This study unraveled the significant biosynthetic pathways induced by FD48 bVOC blends, such as pyruvate metabolism, tryptophan metabolism, sulfur metabolism, fatty acid biosynthesis, and ethanol degradation that anchors in abating moisture stress. Hence, it can be concluded that PGPB <em>B. altitudinis</em> FD48 produced bVOCs could be potential orchestrators of induced systemic tolerance in plants against moisture stress.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100621"},"PeriodicalIF":6.8,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422078","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-30DOI: 10.1016/j.stress.2024.100622
Sajid Shokat , Dominik K. Großkinsky , Fulai Liu
This study aims to understand the combined impact of elevated CO2 and drought stress at flowering stage to explain the adaptation of bread wheat to future climate change scenarios. Four wheat genotypes with 24 replications of each were grown in two different greenhouses, maintaining 400 (ambient) and 800 (elevated) ppm levels of CO2. Irrigation was withheld at flowering to impose drought to 10 replications while 10 were allowed to grow normally. Daily water consumption was recorded until the pot-water of drought plants reached 10 % of the well-watered ones. This study was aided by the measurement of ecophysiology, phytohormones, and yield-related traits. In comparison to normal CO2, plants consumed the pot water quickly under elevated CO2. Further, the threshold value of the fraction of transpirable soil water, at which the relative transpiration is diverging from 1 was different at the two levels of CO2, and among genotypes. Drought significantly reduced plant water relations, gas exchange parameters, grain yield, and yield-related traits but enhanced osmotic adjustment, kernel abortion, and most of the phytohormones in leaves and spikes. Elevated CO2 though increased gas exchange parameters significantly under well-watered conditions but these parameters were significantly reduced under combined effect with drought and resultantly, lower yield-related traits were recorded. Moreover, we also identified a strong positive association between leaf trans-zeatin and a strong negative association of leaf and spike ABA and ACC with grain yield indicating that maintenance of a higher level of leaf trans-zeatin or lower levels of ABA and ACC can help plants to adapt better to the combination of elevated CO2 and drought.
本研究旨在了解高浓度二氧化碳和开花期干旱胁迫的综合影响,以解释面包小麦对未来气候变化情景的适应性。四种小麦基因型在两个不同的温室中生长,每个基因型有 24 个重复,分别保持 400 ppm(环境)和 800 ppm(升高)的二氧化碳水平。10个重复在开花时停止灌溉以施加干旱,10个重复正常生长。记录每天的耗水量,直到干旱植物的盆水达到浇水充足植物的 10%。生态生理学、植物激素和产量相关性状的测量为本研究提供了帮助。与正常 CO2 相比,植物在高浓度 CO2 条件下消耗盆水的速度更快。此外,在两种二氧化碳水平下,相对蒸腾量偏离 1 时的可蒸腾土壤水分阈值不同,不同基因型的阈值也不同。干旱明显降低了植物的水分关系、气体交换参数、谷物产量和产量相关性状,但增强了渗透调节、籽粒流产以及叶片和穗中的大部分植物激素。在水分充足的条件下,二氧化碳升高会显著增加气体交换参数,但在与干旱共同作用的条件下,这些参数会显著降低,从而导致产量相关性状降低。此外,我们还发现叶片反玉米素与谷物产量呈强正相关,而叶片和穗粒 ABA 和 ACC 与谷物产量呈强负相关,这表明保持较高水平的叶片反玉米素或较低水平的 ABA 和 ACC 能帮助植物更好地适应二氧化碳升高和干旱的共同作用。
{"title":"Specific phytohormones levels in leaves and spikes of wheat explains the effects of elevated CO2 on drought stress at the flowering stage","authors":"Sajid Shokat , Dominik K. Großkinsky , Fulai Liu","doi":"10.1016/j.stress.2024.100622","DOIUrl":"10.1016/j.stress.2024.100622","url":null,"abstract":"<div><div>This study aims to understand the combined impact of elevated CO<sub>2</sub> and drought stress at flowering stage to explain the adaptation of bread wheat to future climate change scenarios. Four wheat genotypes with 24 replications of each were grown in two different greenhouses, maintaining 400 (ambient) and 800 (elevated) ppm levels of CO<sub>2</sub>. Irrigation was withheld at flowering to impose drought to 10 replications while 10 were allowed to grow normally. Daily water consumption was recorded until the pot-water of drought plants reached 10 % of the well-watered ones. This study was aided by the measurement of ecophysiology, phytohormones, and yield-related traits. In comparison to normal CO<sub>2</sub>, plants consumed the pot water quickly under elevated CO<sub>2</sub>. Further, the threshold value of the fraction of transpirable soil water, at which the relative transpiration is diverging from 1 was different at the two levels of CO<sub>2</sub>, and among genotypes. Drought significantly reduced plant water relations, gas exchange parameters, grain yield, and yield-related traits but enhanced osmotic adjustment, kernel abortion, and most of the phytohormones in leaves and spikes. Elevated CO<sub>2</sub> though increased gas exchange parameters significantly under well-watered conditions but these parameters were significantly reduced under combined effect with drought and resultantly, lower yield-related traits were recorded. Moreover, we also identified a strong positive association between leaf trans-zeatin and a strong negative association of leaf and spike ABA and ACC with grain yield indicating that maintenance of a higher level of leaf trans-zeatin or lower levels of ABA and ACC can help plants to adapt better to the combination of elevated CO<sub>2</sub> and drought.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100622"},"PeriodicalIF":6.8,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421973","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Despite the importance of action potentials (APs) in plant stress physiology, the molecular identity of Ca2+ channels that initiate APs by passing Ca2+ into the cytoplasm is still unknown in Characean macroalgae. While the Thiel-Beilby mathematical model of AP generation proposes that Ca2+ channels are activated by inositol 1,4,5-trisphosphate (IP3), this hypothesis is controversial because plants do not possess animal IP3 receptor gene homologues. In the present study, we employed the two-electrode current/voltage clamp technique to determine whether IP3 and another inositol phosphate IP6 could modulate the electrogenic parameters of an aquatic macrophyte Nitellopsis obtusa internodal cells. IP3 had no significant effect, whereas IP6 reversibly hyperpolarised the AP excitation threshold which is consistent with the activation of Ca2+ channels. IP6 also shifted the reversal potentials of the Ca2+ and Cl– currents during excitation to negative membrane potential values, indicating altered calcium dynamics in the cytoplasm. These findings suggest the regulation of Ca2+ channels during electrical excitation by IP6 rather than IP3. IP6-induced shift of Ca2+ channel voltage dependence allows a lower magnitude external stressor to initiate electrical signalling, thus turning on various downstream physiological responses.
{"title":"Inositol hexakisphosphate (IP6) enhances the electrical excitability of Characean Nitellopsis obtusa","authors":"Vilmantas Pupkis, Judita Janužaitė, Indrė Lapeikaitė, Vilma Kisnierienė","doi":"10.1016/j.stress.2024.100618","DOIUrl":"10.1016/j.stress.2024.100618","url":null,"abstract":"<div><div>Despite the importance of action potentials (APs) in plant stress physiology, the molecular identity of Ca<sup>2+</sup> channels that initiate APs by passing Ca<sup>2+</sup> into the cytoplasm is still unknown in Characean macroalgae. While the Thiel-Beilby mathematical model of AP generation proposes that Ca<sup>2+</sup> channels are activated by inositol 1,4,5-trisphosphate (IP<sub>3</sub>), this hypothesis is controversial because plants do not possess animal IP<sub>3</sub> receptor gene homologues. In the present study, we employed the two-electrode current/voltage clamp technique to determine whether IP<sub>3</sub> and another inositol phosphate IP<sub>6</sub> could modulate the electrogenic parameters of an aquatic macrophyte <em>Nitellopsis obtusa</em> internodal cells. IP<sub>3</sub> had no significant effect, whereas IP<sub>6</sub> reversibly hyperpolarised the AP excitation threshold which is consistent with the activation of Ca<sup>2+</sup> channels. IP<sub>6</sub> also shifted the reversal potentials of the Ca<sup>2+</sup> and Cl<sup>–</sup> currents during excitation to negative membrane potential values, indicating altered calcium dynamics in the cytoplasm. These findings suggest the regulation of Ca<sup>2+</sup> channels during electrical excitation by IP<sub>6</sub> rather than IP<sub>3</sub>. IP<sub>6</sub>-induced shift of Ca<sup>2+</sup> channel voltage dependence allows a lower magnitude external stressor to initiate electrical signalling, thus turning on various downstream physiological responses.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100618"},"PeriodicalIF":6.8,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422075","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.stress.2024.100617
Aina Inam , Sumera Javad , Iqra Naseer , Pravej Alam , Zainab M. Almutairi , Mohammad Faizan , Shafia Zauq , Anis Ali Shah
Water stress significantly impedes the normal growth and development of crops. Water scarcity profoundly affects crop growth and productivity, notably impacting vital crops like maize (Zea mays L.). The field of nanotechnology has surfaced as a promising avenue for mitigating the negative consequences of water stress on crucial crops. The objective of this study was to alleviate the negative impacts of drought stress on maize (Z. mays) via the utilization of chitosan-loaded nanoparticles (CSNPs). The CSNPs were synthesized using extracts from Nigella sativa L. and were characterized by employing scanning electron microscopy (SEM), X-ray diffraction (XRD), UV–Vis spectroscopy, and Fourier-transform infrared spectroscopy (FTIR). The optimized CSNPs doses from the screening experiment (ranges between 300 µg/L to 500 mg/L) were applied as a foliar spray to maize plants in a pot experiment, in both typical and drought scenarios. A completely randomized factorial design (CRD) was employed for the experiment. Characterization by SEM analysis showed the existence of CSNPs, displaying an average particle size of 89 nm. Whereas XRD analysis showed a crystalline structure. FTIR analysis unveiled the existence of diverse functional groups that functioned as reducing agents on the surface of synthesized CSNPs. Furthermore, CSNPs significantly mitigated the negative effects of water stress by positively influencing various growth parameters of maize crops. It was noted that there was an increase in plant length by 10.20 %, leaf area by 29.87 %, number of tillers per plant by 5.92 %, ear length by 8.66 %, cob weight by 47.22 %, and number of grains by 462.42 % in comparison to the control. Moreover, the utilization of CSNPs had a profound impact on phytochemical parameters, including osmotic potential increases by 5.61 %, relative water content decreases by 2.24 %, chlorophyll and carotenoid content decreases by 18.14 % and 17.28 % respectively, membrane stability index increases by 9.82 %, sugar content decreases by 6.085, proteins increases by 61.67 %, phenolics increases by 0.42 %, proline decreases by 5.51 %, flavonoids increases by 21.12 %, and malondialdehyde (MDA) content decreases by 21.07 % in drought stress as compared to control. The levels of MDA, a marker of oxidative stress, in maize, decreased significantly in drought conditions by 21.07 % in response to the application of CSNPs. Stress studies revealed that CSNPs increased the functioning of antioxidant enzymes under drought stress, such as catalase (CAT) by 13.71 %, peroxidase (POD) by 27.17 %, and superoxide dismutase (SOD) by 24.66 %, as compared to control suggesting their role as stress mitigators. In conclusion, the study establishes that chitosan-loaded nanoparticles (CSNPs) positively enhance drought tolerance in maize, making them a potential tool for sustainable agriculture under water-limited conditions.
{"title":"Efficacy of chitosan loaded zinc oxide nanoparticles in alleviating the drastic effects of drought from corn crop","authors":"Aina Inam , Sumera Javad , Iqra Naseer , Pravej Alam , Zainab M. Almutairi , Mohammad Faizan , Shafia Zauq , Anis Ali Shah","doi":"10.1016/j.stress.2024.100617","DOIUrl":"10.1016/j.stress.2024.100617","url":null,"abstract":"<div><div>Water stress significantly impedes the normal growth and development of crops. Water scarcity profoundly affects crop growth and productivity, notably impacting vital crops like maize <em>(Zea mays</em> L.). The field of nanotechnology has surfaced as a promising avenue for mitigating the negative consequences of water stress on crucial crops. The objective of this study was to alleviate the negative impacts of drought stress on maize (<em>Z. mays)</em> via the utilization of chitosan-loaded nanoparticles (CSNPs). The CSNPs were synthesized using extracts from <em>Nigella sativa</em> L. and were characterized by employing scanning electron microscopy (SEM), X-ray diffraction (XRD), UV–Vis spectroscopy, and Fourier-transform infrared spectroscopy (FTIR). The optimized CSNPs doses from the screening experiment (ranges between 300 µg/L to 500 mg/L) were applied as a foliar spray to maize plants in a pot experiment, in both typical and drought scenarios. A completely randomized factorial design (CRD) was employed for the experiment. Characterization by SEM analysis showed the existence of CSNPs, displaying an average particle size of 89 nm. Whereas XRD analysis showed a crystalline structure. FTIR analysis unveiled the existence of diverse functional groups that functioned as reducing agents on the surface of synthesized CSNPs. Furthermore, CSNPs significantly mitigated the negative effects of water stress by positively influencing various growth parameters of maize crops. It was noted that there was an increase in plant length by 10.20 %, leaf area by 29.87 %, number of tillers per plant by 5.92 %, ear length by 8.66 %, cob weight by 47.22 %, and number of grains by 462.42 % in comparison to the control. Moreover, the utilization of CSNPs had a profound impact on phytochemical parameters, including osmotic potential increases by 5.61 %, relative water content decreases by 2.24 %, chlorophyll and carotenoid content decreases by 18.14 % and 17.28 % respectively, membrane stability index increases by 9.82 %, sugar content decreases by 6.085, proteins increases by 61.67 %, phenolics increases by 0.42 %, proline decreases by 5.51 %, flavonoids increases by 21.12 %, and malondialdehyde (MDA) content decreases by 21.07 % in drought stress as compared to control. The levels of MDA, a marker of oxidative stress, in maize, decreased significantly in drought conditions by 21.07 % in response to the application of CSNPs. Stress studies revealed that CSNPs increased the functioning of antioxidant enzymes under drought stress, such as catalase (CAT) by 13.71 %, peroxidase (POD) by 27.17 %, and superoxide dismutase (SOD) by 24.66 %, as compared to control suggesting their role as stress mitigators. In conclusion, the study establishes that chitosan-loaded nanoparticles (CSNPs) positively enhance drought tolerance in maize, making them a potential tool for sustainable agriculture under water-limited conditions.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100617"},"PeriodicalIF":6.8,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-26DOI: 10.1016/j.stress.2024.100619
Júlia Hunková , Monika Lisinovičová , Veronika Lancíková, Monika Szabóová, Jana Kačírová, Veronika Mistríková, Andrea Hricová
Phytoextraction belongs to the most promising and effective strategies for phytoremediation of soils contaminated with heavy metals (HMs). The aim of this study was to determine the phytoextraction potential of two Slovak grain amaranth cultivars Pribina (Amaranthus cruentus) and Zobor (Amaranthus hypochondriacus × Amaranthus hybridus) compared to a commercial cultivar Plainsman (A. hypochondriacus × A. hybridus). Hydroponic experiment was set up for 14 days of treatment with 200 mg l-1 Pb(NO3)2, 150 mg l-1 ZnCl2, and 300 mg l-1 MnCl2. The results showed that all cultivars reacted differently to HMs exposure. Based on the morphological analyses, cv. Pribina and cv. Zobor showed a higher level of HM tolerance, especially to manganese. Location of zinc ions was performed by histochemical staining in roots tissues of treated plants. Biochemical analyses showed that lipid peroxidation was more pronounced in cv. Zobor and Plainsman, while guaiacol peroxidase activity was increased in cv. Pribina. Photosynthetic pigments remained mostly unaffected by HM treatment. Significant changes in gene expression were detected in all cultivars, especially for stress-related genes AhDGR2 and Ah24. Translocation of HMs from roots to shoots was not efficient enough to consider grain amaranth as a hyperaccumulator, but a strong phytostabilization potential is presumed for each examined cultivar.
{"title":"A comparative analysis of heavy metal stress responses in different grain amaranth cultivars","authors":"Júlia Hunková , Monika Lisinovičová , Veronika Lancíková, Monika Szabóová, Jana Kačírová, Veronika Mistríková, Andrea Hricová","doi":"10.1016/j.stress.2024.100619","DOIUrl":"10.1016/j.stress.2024.100619","url":null,"abstract":"<div><div>Phytoextraction belongs to the most promising and effective strategies for phytoremediation of soils contaminated with heavy metals (HMs). The aim of this study was to determine the phytoextraction potential of two Slovak grain amaranth cultivars Pribina (<em>Amaranthus cruentus</em>) and Zobor (<em>Amaranthus hypochondriacus × Amaranthus hybridus</em>) compared to a commercial cultivar Plainsman (<em>A. hypochondriacus × A. hybridus</em>). Hydroponic experiment was set up for 14 days of treatment with 200 mg <span>l</span><sup>-1</sup> Pb(NO<sub>3</sub>)<sub>2</sub>, 150 mg <span>l</span><sup>-1</sup> ZnCl<sub>2</sub>, and 300 mg <span>l</span><sup>-1</sup> MnCl<sub>2</sub>. The results showed that all cultivars reacted differently to HMs exposure. Based on the morphological analyses, cv. Pribina and cv. Zobor showed a higher level of HM tolerance, especially to manganese. Location of zinc ions was performed by histochemical staining in roots tissues of treated plants. Biochemical analyses showed that lipid peroxidation was more pronounced in cv. Zobor and Plainsman, while guaiacol peroxidase activity was increased in cv. Pribina. Photosynthetic pigments remained mostly unaffected by HM treatment. Significant changes in gene expression were detected in all cultivars, especially for stress-related genes <em>AhDGR2</em> and <em>Ah24</em>. Translocation of HMs from roots to shoots was not efficient enough to consider grain amaranth as a hyperaccumulator, but a strong phytostabilization potential is presumed for each examined cultivar.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100619"},"PeriodicalIF":6.8,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422079","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-25DOI: 10.1016/j.stress.2024.100616
Jeremiah M. Hlahla , Mpho S. Mafa , Rouxléne van der Merwe , Makoena J. Moloi
The combined drought and heat (DH) stress have devastating effects on plant physiological and biochemical processes, leading to poor yield. The aims of this study were to identify the physio-biochemical mechanisms employed by edamame (Glycine max L. Merrill) for survival and to establish better performing cultivars under DH stress. The impact of DH stress on the photosynthesis efficiency and osmolytes production in three edamame cultivars (UVE14, UVE17 and AGS429) was investigated. Non-destructive measurements were performed to determine the photosynthesis attributes, while pigments, non-structural carbohydrates (starch, glucose, sucrose, trehalose) and proline were extracted and quantified spectrophotometrically. The results showed that chlorophyll a (Chl-a), Chl-b, total chlorophyll and carotenoids in AGS429 were not affected under DH stress, which corresponded to increased normalised difference vegetative index (NDVI). Positive correlations between the carotenoids and total chlorophyll contents suggest that in AGS429, prevention of chlorophyll degradation under DH stress could be attributed to the increased carotenoids because they have antioxidative function. Additionally, AGS429 and UVE14 had increased trehalose, suggesting high osmotic adjustment under DH stress. An increase in starch production maintained glucose balance in AGS429 and UVE14, demonstrating higher photosynthetic efficiency compared to UVE17. The DH stress reduced photochemical reactions and carbohydrate accumulation in UVE17. This study shows that AGS429 and UVE14 protected the photosystems and photosynthetic pigments during DH stress, which led to higher photosynthetic capacity and accumulation of carbohydrates. Thus, maintaining the photosynthesis efficiency and carbohydrate metabolism processes in the AGS429 and UVE14 were adaptation features under DH stress.
{"title":"Exploring edamame survival mechanisms under combined drought and heat stress: Photosynthesis efficiency and carbohydrate accumulation","authors":"Jeremiah M. Hlahla , Mpho S. Mafa , Rouxléne van der Merwe , Makoena J. Moloi","doi":"10.1016/j.stress.2024.100616","DOIUrl":"10.1016/j.stress.2024.100616","url":null,"abstract":"<div><div>The combined drought and heat (DH) stress have devastating effects on plant physiological and biochemical processes, leading to poor yield. The aims of this study were to identify the physio-biochemical mechanisms employed by edamame (<em>Glycine</em> max L. Merrill) for survival and to establish better performing cultivars under DH stress. The impact of DH stress on the photosynthesis efficiency and osmolytes production in three edamame cultivars (UVE14, UVE17 and AGS429) was investigated. Non-destructive measurements were performed to determine the photosynthesis attributes, while pigments, non-structural carbohydrates (starch, glucose, sucrose, trehalose) and proline were extracted and quantified spectrophotometrically. The results showed that chlorophyll <em>a</em> (Chl-a), Chl-b, total chlorophyll and carotenoids in AGS429 were not affected under DH stress, which corresponded to increased normalised difference vegetative index (NDVI). Positive correlations between the carotenoids and total chlorophyll contents suggest that in AGS429, prevention of chlorophyll degradation under DH stress could be attributed to the increased carotenoids because they have antioxidative function. Additionally, AGS429 and UVE14 had increased trehalose, suggesting high osmotic adjustment under DH stress. An increase in starch production maintained glucose balance in AGS429 and UVE14, demonstrating higher photosynthetic efficiency compared to UVE17. The DH stress reduced photochemical reactions and carbohydrate accumulation in UVE17. This study shows that AGS429 and UVE14 protected the photosystems and photosynthetic pigments during DH stress, which led to higher photosynthetic capacity and accumulation of carbohydrates. Thus, maintaining the photosynthesis efficiency and carbohydrate metabolism processes in the AGS429 and UVE14 were adaptation features under DH stress.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100616"},"PeriodicalIF":6.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-25DOI: 10.1016/j.stress.2024.100614
Nimra Iqbal , Amna Shoaib , Qudsia Fatima , Mohammad Abul Farah , Vaseem Raja
Pathogenic fungi such as Fusarium verticillioides, Alternaria alternata, and Macrophomina phaseolina pose significant threats to agriculture and human health due to their production of carcinogenic mycotoxins. This study explored the antifungal potential of chitosan nanoparticles (ChNPs) against these fungi. ChNPs, synthesized via an ionic gelation method, exhibited a prominent UV–visible absorption peak at 250 nm, confirming successful nanoparticle formation. X-ray diffraction patterns revealed their amorphous structure, while FTIR analysis identified key functional groups, including hydroxyl and amine groups, with an average particle size of 50 nm. Antifungal assays demonstrated that ChNPs inhibited fungal growth in a concentration-dependent manner. Specifically, for F. verticillioides, ChNPs reduced growth by 20–60 % at concentrations ranging from 0.03 to 0.15 %, achieving complete inhibition at 0.21 %. Similarly, A. alternata exhibited a MIC of 0.24 %, and M. phaseolina reached a MIC of 0.26 % for complete growth suppression. Higher concentrations of ChNPs caused pronounced structural alterations in the fungi, including discoloration, fragmentation, and distortion of hyphae and conidia/sclerotia, which were linked to significant metabolic changes within the fungal cells. This study highlights the effectiveness of ChNPs as robust antifungal agents, demonstrating their ability to disrupt fungal morphology and enzyme activities.
{"title":"Synthesis and antifungal efficacy of chitosan nanoparticles against notorious mycotoxigenic phytopathogens","authors":"Nimra Iqbal , Amna Shoaib , Qudsia Fatima , Mohammad Abul Farah , Vaseem Raja","doi":"10.1016/j.stress.2024.100614","DOIUrl":"10.1016/j.stress.2024.100614","url":null,"abstract":"<div><div>Pathogenic fungi such as <em>Fusarium verticillioides, Alternaria alternata</em>, and <em>Macrophomina phaseolina</em> pose significant threats to agriculture and human health due to their production of carcinogenic mycotoxins. This study explored the antifungal potential of chitosan nanoparticles (ChNPs) against these fungi. ChNPs, synthesized via an ionic gelation method, exhibited a prominent UV–visible absorption peak at 250 nm, confirming successful nanoparticle formation. X-ray diffraction patterns revealed their amorphous structure, while FTIR analysis identified key functional groups, including hydroxyl and amine groups, with an average particle size of 50 nm. Antifungal assays demonstrated that ChNPs inhibited fungal growth in a concentration-dependent manner. Specifically, for <em>F. verticillioides</em>, ChNPs reduced growth by 20–60 % at concentrations ranging from 0.03 to 0.15 %, achieving complete inhibition at 0.21 %. Similarly, <em>A. alternata</em> exhibited a MIC of 0.24 %, and <em>M. phaseolina</em> reached a MIC of 0.26 % for complete growth suppression. Higher concentrations of ChNPs caused pronounced structural alterations in the fungi, including discoloration, fragmentation, and distortion of hyphae and conidia/sclerotia, which were linked to significant metabolic changes within the fungal cells. This study highlights the effectiveness of ChNPs as robust antifungal agents, demonstrating their ability to disrupt fungal morphology and enzyme activities.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100614"},"PeriodicalIF":6.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-25DOI: 10.1016/j.stress.2024.100615
Mohammad Faizan , Pravej Alam , Asha Kumari , Gali Suresh , Priyanka Sharma , Fadime Karabulut , Sipan Soysal , Ivica Djalovic , Goran Trivan , Muhammad Faheem Adil , Shafaque Sehar , Vishnu D. Rajput , Shamsul Hayat
Heavy metal (HM) toxicity of agricultural soils poses a major risk to plant health, human life, and global food chain. Crop output and health are negatively impacted when HM levels in agricultural soils reach hazardous points. The nano-biochar (nano-BC) mediated stress tolerance has attracted growing scientific interest because biochar has the potential to be a novel and sustainable solution that may be actively included into the development of sustainable agriculture and food production. At present, biochar is extensively employed as a powerful tool to enhance sustainable agriculture with minimal impact on ecosystems and the environment. Nano-BC offers improved surface area, adsorption and mobility properties in soil compared to traditional fertilizers. Furthermore, nano-BC may prove to be the most practical substitute for traditional waste management techniques because of its affordability, sustainability, and environmental friendliness. In this review, we examine the application of nano-BC in the regulation of HM stress tolerance for improving plant growth and development. We focus on the impact of HMs impact on crop productivity, nano-BC amendments, their application, and production. The article also explores the nano-BC risk and toxicity. Through the perspective of multidisciplinary research, this work highlights the significance of nano-BC as cutting-edge tools in the field of agriculture, igniting a paradigm shift toward sustainable and stress-resilient farming systems.
农业土壤中的重金属 (HM) 毒性对植物健康、人类生命和全球食物链构成重大风险。当农业土壤中的重金属含量达到危险点时,作物的产量和健康就会受到负面影响。纳米生物炭(nano-BC)介导的胁迫耐受性引起了科学界越来越多的兴趣,因为生物炭有可能成为一种新颖的可持续解决方案,积极地融入可持续农业和粮食生产的发展中。目前,生物炭已被广泛用作加强可持续农业的有力工具,对生态系统和环境的影响最小。与传统肥料相比,纳米生物碳具有更好的表面积、吸附性和在土壤中的流动性。此外,纳米生化碳因其经济性、可持续性和环境友好性,可能被证明是传统废物管理技术最实用的替代品。在本综述中,我们探讨了纳米生物碱在调节 HM 胁迫耐受性以改善植物生长和发育方面的应用。我们的重点是 HMs 对作物生产力的影响、纳米生物碱的修正、其应用和生产。文章还探讨了纳米生物碱的风险和毒性。通过多学科研究的视角,这项工作凸显了纳米生物化学作为农业领域尖端工具的重要意义,点燃了向可持续和抗逆性农业系统转变的范式。
{"title":"Unraveling the nano-biochar mediated regulation of heavy metal stress tolerance for sustaining plant health","authors":"Mohammad Faizan , Pravej Alam , Asha Kumari , Gali Suresh , Priyanka Sharma , Fadime Karabulut , Sipan Soysal , Ivica Djalovic , Goran Trivan , Muhammad Faheem Adil , Shafaque Sehar , Vishnu D. Rajput , Shamsul Hayat","doi":"10.1016/j.stress.2024.100615","DOIUrl":"10.1016/j.stress.2024.100615","url":null,"abstract":"<div><div>Heavy metal (HM) toxicity of agricultural soils poses a major risk to plant health, human life, and global food chain. Crop output and health are negatively impacted when HM levels in agricultural soils reach hazardous points. The nano-biochar (nano-BC) mediated stress tolerance has attracted growing scientific interest because biochar has the potential to be a novel and sustainable solution that may be actively included into the development of sustainable agriculture and food production. At present, biochar is extensively employed as a powerful tool to enhance sustainable agriculture with minimal impact on ecosystems and the environment. Nano-BC offers improved surface area, adsorption and mobility properties in soil compared to traditional fertilizers. Furthermore, nano-BC may prove to be the most practical substitute for traditional waste management techniques because of its affordability, sustainability, and environmental friendliness. In this review, we examine the application of nano-BC in the regulation of HM stress tolerance for improving plant growth and development. We focus on the impact of HMs impact on crop productivity, nano-BC amendments, their application, and production. The article also explores the nano-BC risk and toxicity. Through the perspective of multidisciplinary research, this work highlights the significance of nano-BC as cutting-edge tools in the field of agriculture, igniting a paradigm shift toward sustainable and stress-resilient farming systems.</div></div>","PeriodicalId":34736,"journal":{"name":"Plant Stress","volume":"14 ","pages":"Article 100615"},"PeriodicalIF":6.8,"publicationDate":"2024-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142359533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}