Dr. Saranya Devi K

Selection of potential isolates of plant growth promoting rhizobacteria (pgpr) in conferring salt tolerance under in vitro

• Authors Details :  
• V. Mohan And Saranya Devi K

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Salinity is a major environmental stress which has been studied extensively and has its impact on agriculture in the past, present and future. The global importance of salt affected soils can be explained by their wide distribution on all continents covering about 10% of the total land surface. At present, there are nearly 954 million ha of saline soils on earth’s surface. It is extremely difficult to quantify the social and economic costs of salt prone land and water resources. Plant Growth Promoting Rhizobacteria (PGPR) is a group of bacteria that actively colonize plant roots and increase plant growth and yield. They play an important role within the interaction between soil and plant. As plants grow on marginal soils such as saline soils, the importance of the rhizobacteria increases as they mobilize nutrients and provide tolerance ability to the plants. In the present study, an attempt was made and isolated 51 PGPR isolates (Phosphate Solubilizing Bacteria–18; Azotobacter spp.-16 and Azospirillum spp.-17) from different salt affected areas in Tamil Nadu and Puducherry. All the isolates were screened for their efficacy against different sodium salts namely sodium chloride, sodium citrate and sodium sulphate. It was observed that the absorbance of the culture broth grown in salt stress to sodium chloride decreased with increasing concentration of the salt. Similarly decrease in growth pattern in terms of the absorbance was also observed in salt stress to sodium citrate and sodium sulphate.

Article Subject Details

• Biological Sciences

Article Keywords Details

• Azospirillum
• Azotobacter
• phosphobacterium
• saline soil
• Plant growth promoting rhizobacteria

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