Vishal Kumar Deshwal* and Niharika Thapliyal1
Department of Microbiology, BFIT Group of Institutions, Dehradun
1Department of Microbiology, Uttaranchal (P.G.) College of Bio-Medical Sciences
& Hospital, Dehradun
Email: vishal_deshwal@rediffmail.com
Received-08.08.2019, Revised-27.08.2019
Abstract: Aim of present study is to evaluate the effect of PGPR Pseudomonas strains on plant growth activity of paddy crop. All Pseudomonas strains were isolated from rhizosphere of paddy crop. Pseudomonas strains were isolated on King’s B medium and fluorescent Pseudomonas strains were characterized by biochemical tests. Further, three Pseudomonas strains which were IAA positive, HCN positive and Phosphorous solubilize strains named as Pseudomonas PS1, PS2, PS3. Total 04 treatments were prepared and these were Pseudomonas PS-1 + Paddy seed, Pseudomonas PS-2 + Paddy seed, Pseudomonas PS-3 + Paddy seed and uninoculated seed (control). Few plant growth parameters such as seed germination, plant height, fresh weight and dry weight of paddy crop were recorded. Pseudomonas PS1 showed highest seed germination which was 58.33% more as compared to control. These isolated plant growth promoting Pseudomonas strains increased root and shoot length by at least 100 and 50 % more respectively as compared to control. Highest root length has been observed in Pseudomonas PS2 treatment but highest shoot recorded in Pseudomonas PS1. Further, all strains increased fresh weight and dry weight of root by at least 354 and 202 % more respectively as compared to control but Pseudomonas PS1 enhanced 379.27 and 218.57 % more fresh weight and dry weight of root respectively as compared to control. Pseudomonas PS1 treatment showed highest fresh and dry weight of shoot by 207.3 and 459.46 % respectively. All results suggested that Pseudomonas strains effectively increase plant growth in Paddy crop.
Keywords: Pseudomonas, IAA, HCN, Phosphorous solubilization, Paddy crop
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