1. Plant growth-promoting bacteria Bacillus amyloliquefaciens NBRISN13 modulates gene expression profile of leaf and rhizosphere community in rice during salt stress.
- Author
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Nautiyal CS, Srivastava S, Chauhan PS, Seem K, Mishra A, and Sopory SK
- Subjects
- Bacillus classification, Bacillus drug effects, Bacillus growth & development, Gene Expression Regulation, Plant, Genes, Plant, Hydroponics, Oryza genetics, Oryza growth & development, Oryza metabolism, Phylogeny, Plant Leaves growth & development, Plant Leaves microbiology, Principal Component Analysis, Salt-Tolerant Plants drug effects, Salt-Tolerant Plants microbiology, Sodium Chloride pharmacology, Soil analysis, Soil Microbiology, Transcription, Genetic, Bacillus metabolism, Oryza microbiology, Plant Leaves genetics, Rhizosphere, Stress, Physiological, Transcriptome
- Abstract
Growth and productivity of rice and soil inhabiting microbial population is negatively affected by soil salinity. However, some salt resistant, rhizosphere competent bacteria improve plant health in saline stress. Present study evaluated the effect of salt tolerant Bacillus amyloliquefaciens NBRISN13 (SN13) inoculation on rice plants in hydroponic and soil conditions exposed to salinity. SN13 increased plant growth and salt tolerance (NaCl 200 mM) and expression of at least 14 genes under hydroponic and soil conditions in rice. Among these 14 genes 4 (NADP-Me2, EREBP, SOSI, BADH and SERK1) were up-regulated and 2 (GIG and SAPK4) repressed under salt stress in hydroponic condition. In greenhouse experiment, salt stress resulted in accumulation of MAPK5 and down-regulation of the remaining 13 transcripts was observed. SN13 treatment, with or without salt gave similar expression for all tested genes as compared to control. Salt stress caused changes in the microbial diversity of the rice rhizosphere and stimulated population of betaine-, sucrose-, trehalose-, and glutamine-utilizing bacteria in salt-treated rice rhizosphere (SN13 + salt). The observations imply that SN13 confers salt tolerance in rice by modulating differential transcription in a set of at least 14 genes. Stimulation of osmoprotectant utilizing microbial population as a mechanism of inducing salt tolerance in rice is reported for the first time in this study to the best of our knowledge., (Copyright © 2013 Elsevier Masson SAS. All rights reserved.)
- Published
- 2013
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