Efficiency of Plant Growth Promoting Rhizobacteria for the Enhancement of Cicer arietinum L. Growth and Germination under Salinity

Plant growth promoting rhizobacteria (PGPR) are beneficial bacteria that colonize plant roots and enhance plant growth by a wide variety of mechanisms. Ten isolates of bacteria designated as PGB1, PGB2, PGB3, PGB4, PGB5, PGT1, PGT2, PGT3, PGG1 and PGG2 were successfully isolated and characterized. Subsequently to investigate the effect of PGPR isolates on the growth of Cicer arietinum, a pot culture experiment was conducted. Prior to seeds grown in plastic pots, seeds were treated with PGPR isolates and seedlings were harvested after 21 days of inoculation. Isolates PGB4, PGT1, PGT2, PGT3, PGG1 and PGG2 induce the production of indole acetic acid, whereas only PGT3 isolate was able to solubilize phosphorus. Most of isolates resulted in a significant increasing of shoot length, root length and dry matter production of shoot and root of Cicer arietinum seedlings. Application of PGPR isolates significantly improves the percentage of seed germination under saline conditions. The present study, therefore suggest that the use of PGPR isolates PGB4, PGG2 and PGT3 as inoculants biofertilizers might be beneficial for Cicer arietinum cultivation.

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