植物促生根瘤菌(PGPR)通过调节大麦营养状况减轻盐胁迫和干旱胁迫的不利影响

IF 2.1 Q3 SOIL SCIENCE Applied and Environmental Soil Science Pub Date : 2023-08-16 DOI:10.1155/2023/7261784
Sania Zaib, Akmal Zubair, Safdar Abbas, Javed Hussain, Ishaq Ahmad, Samina N. Shakeel
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引用次数: 1

摘要

随着对可持续农业、粮食安全和环境保护的日益重视,有益土壤微生物的使用势在必行,因为化肥、农药和除草剂等化学品的使用导致了食品污染、疾病、杂草抗性和负面的环境后果,最终影响了人类健康。气候变化是影响农作物生产的一个重要因素,也是人们十分关注的问题。非生物胁迫,包括盐胁迫和干旱胁迫,抑制作物产量。本研究的目的是了解植物促生根瘤菌(PGPR)通过改变营养结构在抵抗盐胁迫和干旱胁迫中的作用。本研究通过对接种后的大麦(Hordeum vulgare L.)植株进行200 mM、1000 mM盐胁迫和干旱胁迫,比较其种子萌发、茎、根生物量和光合活性等各项参数与未处理的大麦植株的差异。我们的数据显示,在应用了PGPR(荧光假单胞菌SBW25和恶臭假单胞菌KT2440)的大麦植株中,这些参数得到了改善或显著增强。此外,利用粒子诱导x射线发射(PIXE)技术分析了pgpr接种和未接种植株在胁迫和无胁迫条件下的元素分析。我们对各种宏量和微量营养素的PIXE分析显示,在pgpr处理的植物中,Ca, Mg, K, P, S, Al和Si的吸收增强。与对照(根= 8.9 mg/kg,茎= 469.5 mg/kg)相比,200 mM盐胁迫下的大麦根部(KT2440 = 7.7 mg/kg, SBW25 = 6.3 mg/kg)和茎部(KT2440 = 406.4 mg/kg, SBW25 = 365.5 mg/kg)的Cl -含量降低,而在相同的胁迫条件下,大麦叶片(KT2440 = 405 mg/kg, SBW25 = 416.4 mg/kg)的Cl -含量显著高于对照(110.6 mg/kg)。在1000 mM盐胁迫下,与对照(根= 15.2 mg/kg,茎= 1605.2 mg/kg,叶= 1165.2 mg/kg)相比,施用pgpr的大麦根(KT2440 = 7.6 mg/kg)、茎(KT2440 = 1205.8 mg/kg, SBW25 = 1008.3 mg/kg)、叶(KT2440 = 967.8 mg/kg, SBW25 = 530.8 mg/kg)的Cl -含量显著降低。另一方面,干旱胁迫下施用pgpr的大麦根(KT2440 = 29.5 mg/kg, SBW25 = 25.8 mg/kg)、茎(KT2440 = 1023.8 mg/kg, SBW25 = 894.9 mg/kg)、叶(KT2440 = 369.2 mg/kg, SBW25 = 409.8 mg/kg)的Cl -含量显著高于对照(根= 13.5 mg/kg,茎= 505.3 mg/kg,叶片= 219.9 mg/kg)。在控制和胁迫条件下,施用PGPR对大麦植株各部位微量元素(Mn、Fe、Co、Ni、Cu和Zn)的吸收也有效。总的来说,我们的研究结果揭示了宏观和微量营养素的吸收的改善,以增强盐和干旱胁迫的耐受性。综上所述,这些PGPR物种是胁迫条件下大麦及相关植物耐胁迫和提高生长的有效来源。
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Plant Growth-Promoting Rhizobacteria (PGPR) Reduce Adverse Effects of Salinity and Drought Stresses by Regulating Nutritional Profile of Barley
With the growing emphasis on sustainable agriculture, food security, and environmental protection, the use of beneficial soil microbes is imperative, as the use of chemicals such as fertilizers, pesticides, and herbicides has resulted in food contamination, disease, weed resistance, and negative environmental consequences, which ultimately impacted human health. Climate change is a major factor and is of great concern for crop production. Abiotic stresses, including salt and drought stress, restrain the crop yield. The aim of this particular study is to understand what role do plant growth-promoting rhizobacteria (PGPR) play in combating the salinity and drought stresses through modification of nutritional profile. In the current study, inoculated barley (Hordeum vulgare L.) plants were subjected to various stresses such as 200 mM and 1000 mM salinity stress as well as drought stress, and then their various parameters such as seed germination as well as shoot and root biomasses and photosynthetic activity were compared with non-treated stressed barley plants. Our data depicted an improvement or significant enhancement of these parameters in PGPR (Pseudomonas fluorescens SBW25 and Pseudomonas putida KT2440) applied barley plants. Furthermore, the particle-induced X-ray emission (PIXE) technique was used for the elemental analysis of PGPR-inoculated and non-inoculated plants under stress vs. no stress conditions. Our PIXE analysis of various macro- and micronutrients revealed an enhancement of Ca, Mg, K, P, S, Al, and Si uptake in PGPR-treated plants. PGPR applications depicted reduced Cl− contents in 200 mM salt-stressed barley roots (KT2440 = 7.7 mg/kg and SBW25 = 6.3 mg/kg) and stems (KT2440 = 406.4 mg/kg and SBW25 = 365.5 mg/kg) as compared to controls (roots = 8.9 and stems = 469.5), while they displayed a significant increase in the barley leaves (KT2440 = 405 mg/kg and SBW25 = 416.4 mg/kg) when compared to control (110.6 mg/kg) under the same stress condition. In 1000 mM salt stress, a significant reduction in the Cl− content was observed in PGPR-applied barley roots (KT2440 = 7.6 mg/kg), stems (KT2440 = 1205.8 mg/kg and SBW25 = 1008.3 mg/kg), and leaves (KT2440 = 967.8 mg/kg and SBW25 = 530.8 mg/kg) when compared to controls (roots = 15.2 mg/kg, stems = 1605.2 mg/kg, and leaves = 1165.2 mg/kg). On the other hand, a significant increase in the Cl− content was noticed in PGPR-applied barley roots (KT2440 = 29.5 mg/kg and SBW25 = 25.8 mg/kg), stems (KT2440 = 1023.8 mg/kg and SBW25 = 894.9 mg/kg), and leaves (KT2440 = 369.2 mg/kg and SBW25 = 409.8 mg/kg) when compared to controls (roots = 13.5 mg/kg, stems = 505.3 mg/kg, and leaves = 219.9 mg/kg) under drought stress condition. PGPR application was also found to be effective for enhancing the uptake of micronutrients (Mn, Fe, Co, Ni, Cu, and Zn) in barley plant parts under control and also under stressed conditions. Overall, our findings revealed an improvement in the uptake of macro- and micronutrients for the enhancement of salinity and drought stress tolerance. Conclusively, these PGPR species are an effective source of plant stress tolerance and elevated growth of barley and related plants under stress conditions.
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来源期刊
Applied and Environmental Soil Science
Applied and Environmental Soil Science Earth and Planetary Sciences-Earth-Surface Processes
CiteScore
4.00
自引率
4.50%
发文量
55
审稿时长
18 weeks
期刊介绍: Applied and Environmental Soil Science is a peer-reviewed, Open Access journal that publishes research and review articles in the field of soil science. Its coverage reflects the multidisciplinary nature of soil science, and focuses on studies that take account of the dynamics and spatial heterogeneity of processes in soil. Basic studies of the physical, chemical, biochemical, and biological properties of soil, innovations in soil analysis, and the development of statistical tools will be published. Among the major environmental issues addressed will be: -Pollution by trace elements and nutrients in excess- Climate change and global warming- Soil stability and erosion- Water quality- Quality of agricultural crops- Plant nutrition- Soil hydrology- Biodiversity of soils- Role of micro- and mesofauna in soil
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