Effect of Plant Growth Promoting Rhizobacteria on the Productivity of Lupine and Chickpea

Three rhizobacterial strains i.e., Serratia sp., Paenibacillus polymyxa and Pseudomonas flourescens were examined in vitro for achieving the traits that being related to plant growth promoting effects as well as, two pot experiments were carried out to study the impacts of rhizobacterial co-inoculation on growth of lupine or chickpea plants under sand soil conditions. Rhizobaterial strains were applied either singly or combined with nodulating Bradyhizobium (lupine) or Mesorhizobium (chickpea) plants or as mixed inoculants. The qualitative assay revealed that the tested PGPRs expressed variable magnitudes of PGP -related properties with superiority of P. polymyxa and Serratia sp. in IAA, siderophores, as well as P-solubilization. Inoculants which comprised Bradyrhizobium or Rhizobium with Serratia exhibited superiority for hastening all parameters under investigation : nodules number, nodules dry weight,nitrogenase activity, root dry weight ,root surface ,plant height ,shoot dry weight ,total chlorophyll, yield and other related components.