Bacillus siamensis strain BW enhances rice growth and salinity tolerance through redox equilibrium and hormone modulation

IF 5.4 Q1 PLANT SCIENCES Current Plant Biology Pub Date : 2024-01-15 DOI:10.1016/j.cpb.2024.100321
Brahim Oubaha , Ray Singh Rathore , Jayram Bagri , Nitin Kumar Singhal , Koushik Mazumdar , Vikas Rishi , Ashwani Pareek , Sneh Lata Singla-Pareek
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Abstract

High soil salinity has an unfavorable consequence on the growth and productivity of rice crop. However, some salt-tolerant plant growth-promoting bacteria (ST-PGPB) regulate specific physiological, biochemical, and molecular properties to promote crop growth while minimizing the detrimental effects of salt stress. In this regard, we isolated ST-PGPB from rhizospheric soil and examined it to mitigate the salinity stress in rice seedlings. The growth of the bacterium at 3 M NaCl demonstrated its halotolerance, and 16S rRNA sequencing identified it as Bacillus siamensis, and the isolated strain was named BW. Further study indicated that biopriming with BW strain helps plant growth promotion-related phenotype and significantly mitigates salinity stress in rice seedlings. Treatment of rice seeds with BW resulted in significantly improved germination of seedlings at 75 mM to 150 mM NaCl, along with better physiology and biochemical parameters than the untreated ones. Furthermore, Bacillus sp. BW efficiently colonizes rice roots and produces auxin and siderophore, via forming biofilm under different salt concentrations. Under 100–200 mM NaCl treatment conditions, the extracellular metabolite profile from BW showed a substantial abundance in specific metabolites, such as osmoprotective chemicals, suggesting the likely protective mechanism against salinity stress damage. This study demonstrates the role and potential of a halotolerant- BW strain in supporting the growth of rice plants under salinity conditions.

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暹罗芽孢杆菌 BW 菌株通过氧化还原平衡和激素调节提高水稻的生长和耐盐性
土壤盐分过高会对水稻作物的生长和产量造成不利影响。然而,一些耐盐植物生长促进菌(ST-PGPB)能调节特定的生理、生化和分子特性,在促进作物生长的同时,将盐胁迫的不利影响降至最低。为此,我们从根瘤土壤中分离出 ST-PGPB,并对其缓解水稻幼苗的盐胁迫进行了研究。该细菌在 3 M NaCl 条件下的生长证明了其耐盐性,16S rRNA 测序确定其为暹罗芽孢杆菌,并将分离的菌株命名为 BW。进一步的研究表明,用 BW 菌株进行生物处理有助于植物生长促进相关表型的形成,并能显著缓解水稻幼苗的盐胁迫。用 BW 处理水稻种子后,在 75 mM 至 150 mM NaCl 的条件下,秧苗的发芽率明显提高,生理生化指标也优于未处理的秧苗。此外,在不同盐浓度下,BW 杆菌通过形成生物膜有效地定植于水稻根部,并产生辅酶和苷元。在 100-200 mM NaCl 处理条件下,BW 的胞外代谢物图谱显示出大量的特定代谢物,如渗透保护化学物质,这表明其可能具有抵御盐胁迫损伤的保护机制。这项研究证明了耐盐碱 BW 菌株在盐碱条件下支持水稻植物生长的作用和潜力。
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来源期刊
Current Plant Biology
Current Plant Biology Agricultural and Biological Sciences-Plant Science
CiteScore
10.90
自引率
1.90%
发文量
32
审稿时长
50 days
期刊介绍: Current Plant Biology aims to acknowledge and encourage interdisciplinary research in fundamental plant sciences with scope to address crop improvement, biodiversity, nutrition and human health. It publishes review articles, original research papers, method papers and short articles in plant research fields, such as systems biology, cell biology, genetics, epigenetics, mathematical modeling, signal transduction, plant-microbe interactions, synthetic biology, developmental biology, biochemistry, molecular biology, physiology, biotechnologies, bioinformatics and plant genomic resources.
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