Effect of PGPR on enzymatic activities of rice (Oryza sativa L.) under salt stress

Salt stress makes the agricultural lands unproductive and is an obstacle towards obtaining higher crop yield. To investigate the physiological and biochemical basis of salt stress adaptation in rice plants due to inoculation with plant growth promoting bacteria, two rice genotypes namely ADT43 and IR50 treated with Plant Growth Promoting Rhizobacteria (PGPR Pseudomonas strains PF1 and TDK1) were subjected to 100mM sodium chloride (NaCl), following International Rice Research Institute (IRRI) method in NLC Laboratory of Department of Crop Physiology of Tamil Nadu Agricultural University. Results of our study indicate that enzymatic activities (peroxidase, catalase and nitrate reductase) required to alleviate salt stress were much higher in the plants treated with plant growth promoting rhizobacteria strains PF1 and TDK1 compared to the plants with no external treatment. Among all the treatments ADT43 treated with TDK1 showed the best performance with high enzymatic activities. Phytoremediation through root treatment with PGPR in rice seedlings could lessen the adverse impact of salt stress at later stage of the crop growth and hence increase crop yield.

Author(s): Sumita Sen* and C. N. Chandrasekhar

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