Abstract
In the present study, two plant growth promoting rhizobacteria (PGPR) strains of Streptomyces griseus (KAI-26 and MMA-32) and one PGPR strain of S. albus (KAI-27) were screened for their ability to bio-synthesize silver nanoparticles (AgNPs) and evaluated for their growth promotion in chickpea. The formation of Streptomyces-mediated biogenic AgNPs was confirmed through UV–visible spectrophotometer, Dynamic Light Scattering (DLS), Zetapotential, Fourier Transforms Infrared (FTIR) spectroscopy and Transmission Electron Microscope (TEM) analysis. In greenhouse, the biogenic AgNPs followed by Streptomyces strains significantly increased plant growth promoting traits and nitrogen fixation over the untreated plants. Defense enzymes, namely ascorbate peroxidase, catalase, phenylalanine ammonia lyase, polyphenol oxidase and superoxide dismutase were also found higher in the selected Streptomyces and biogenic AgNPs treated chickpea plants. The bio-fortification studies carried out by inductively coupled plasma-optical emission spectroscopy (ICP-OES) revealed a significant enhancement of Fe, Zn, Mn and K contents in the harvested chickpea grains that were treated with the Streptomyces strains and biogenic AgNPs over the untreated plants. The results of the present study, further aids in the efficient utilization of the selected PGPR and their biogenic AgNPs as better delivery agents in agriculture.
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