alexa Stress adaptations in a Plant Growth Promoting Rhizobacterium (PGPR) with increasing salinity in the coastal agricultural soils.
Microbiology

Microbiology

Applied Microbiology: Open Access

Author(s): Paul D, Nair S

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Abstract The costs associated with soil salinity are potentially enormous and the effects of salinity may impact heavily on agriculture, biodiversity and the environment. As the saline areas under agriculture are increasing every year across the globe, it is of much public concern. Agricultural crops and soil microorganisms are affected with salinity. As Plant Growth Promoting Rhizobacteria (PGPR) have been reported to be contributing to the plant health, the osmotolerance mechanisms of these PGPRs are of importance. Pseudomonas fluorescens MSP-393 is a proven biocontrol agent for many of the crops grown in saline soils of coastal ecosystem. Studies revealed that the root colonization potential of the strain was not hampered with higher salinity in soil. As a means of salt tolerance, the strain de novo -synthesized, the osmolytes, Ala, Gly, Glu, Ser, Thr, and Asp in their cytosol. To understand the mechanism of salt tolerance, the proteome analysis of the bacteria was carried out employing 2D gel electrophoresis and MALDI-TOF. Peptide mass fingerprinting and in silico investigation revealed the up regulation of many of salt regulated proteins. It could be ascertained that the osmotolerance mechanisms of MSP-393 viz. de novo synthesis of osmolytes and over production of salt stress proteins effectively nullified the detrimental effects of high osmolarity. MSP-393 could serve as a suitable bioinoculant for crops grown in saline soils. (c) 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This article was published in J Basic Microbiol and referenced in Applied Microbiology: Open Access

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