Abstract
Agriculture accounts for ~ 70% of all water use and the world population is increasing annually; soon more people will need to be fed, while also using less water. The use of plant-associated bacteria (PAB) is an eco-friendly alternative that can increase crop water use efficiency. This work aimed to study the effect of some PAB on increasing soybean tolerance to drought stress, the mechanisms of the drought tolerance process, and the effect of the PAB on promoting plant growth and on the biocontrol of Sclerotinia sclerotiorum. PAB were isolated from soybean rhizosphere and S. sclerotiorum sclerotia. The strains identified as UFGS1 (Bacillus subtilis), UFGS2 (Bacillus thuringiensis), UFGRB2 and UFGRB3 (Bacillus cereus) were selected on their ability to grow in media with reduced water activity. Soybean plants were inoculated with the PAB and evaluated for growth promotion, physiological and molecular parameters, after drought stress. Under drought stress, UFGS2 and UFGRB2 sustained potential quantum efficiency of PSII (Fv/Fm), while a decrease was found in the control plants. Moreover, UFGS2 and UFGRB3 maintained the photosynthetic rates in non-stressed conditions compared to the control. UFGS2-treated plants showed a higher stomatal conductance and higher transpiration than the control, after drought stress. Some PAB-treated plants also had other beneficial phenotypes, such as increases in fresh and dried biomass relative to the control. Differential gene expression analysis of genes involved in plant stress pathways shows changes in expression in PAB-treated plants. Results from this study suggest that PAB can mitigate drought stress in soybean and may improve water efficiency under certain conditions.
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Acknowledgements
The authors express their appreciation to the Brazilian Agricultural Research Corporation (EMBRAPA) for kindly providing the Sclerotinia sclerotiorum strain BRM 29673 to be used in this work. We also thank Caroline Elizabeth Martins for providing an English review of the manuscript.
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Supplementary 1
Maximum Likelihood tree of 16S rRNA of subject strains. The tree was produced using the HKY85 model and complete deletion of missing data. The level of bootstrap support was calculated from 1500 replicates. The bar is equal to 0.01 substitutions per bp. (PNG 110 kb)
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Martins, S.J., Rocha, G.A., de Melo, H.C. et al. Plant-associated bacteria mitigate drought stress in soybean. Environ Sci Pollut Res 25, 13676–13686 (2018). https://doi.org/10.1007/s11356-018-1610-5
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DOI: https://doi.org/10.1007/s11356-018-1610-5