Efficacy of multitrait plant growth promoting bacteria on growth promotion of rice and wheat under water stress and irrigated condition
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Date
2021-03
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Plant growth promoting bacteria (Endophytic and rhizospheric bacteria) have been reported to play key role in alleviation of water stress through various mechanism. In present study, 16 previously isolated endophytic bacteria form rice variety Sahbhagi were characterized by biochemical and functional basis and further evaluated for their efficiency of growth promotion of wheat variety PBW343 under water stress and irrigated conditions. Four endophytic bacteria were selected on the basis of functional characteristics and plant growth promoting ability of wheat and further tested for their growth promotion efficiency of rice variety Sahbhagi under water stress and irrigated condition. Selected endophytic bacteria were compared with rhizospheric bacteria, Variovorax paradoxus (RAA3) and Pseudomonas palleroniana (DPB16) for their efficacy of growth promotion on rice variety IR64 under water stress and irrigated condition. Result showed that endophytic bacteria (Seed 16), was more efficient in plant growth promotion under both water stress and irrigated condition than rhizospheric bacteria. Endophytic bacteria (Seed 16) inoculated along with Arbuscular mycorrhizal fungi (AMF) on rice and wheat under water stress and irrigated condition, result showed that interaction of endophytic bacteria with AMF was more efficient in alleviation of water stress and significantly enhanced rice and wheat growth, than the single inoculation with each organism. Seed 16 was identified as Enterobacter roogenkampii strain S16 using 16S rDNA sequence analysis. Two rhizospheric bacteria Variovorax paradoxus (RAA3) and Pseudomonas palleroniana (DPB16) were evaluated for their effect on growth and yield of two rice variety (DRR44, IR64) and two wheat variety (WH1105, PBW343) under rainfed and irrigated condition in field study. RAA3 significantly enhanced the all yield contributing parameters (plant height, total no of plants, no of tillers, panicle /spike length, no of grains/ panicle or spike, weight of 1000 grains), chlorophyll and enzymatic antioxidants, nutrient content in both rice and wheat under rainfed and irrigated condition. In field experiment of rice, RAA3 treated plants showed maximum grain yield (4.86 ton/ha, 5.13ton/ha) under rainfed and irrigated condition respectively as compared to control plant. In case of wheat, RAA3 treated plants exhibited higher grain yield (4.4 ton/ha, 5.06ton/ha) under rainfed and irrigated condition, respectively, as compared to their respective untreated plants. Finding of present study suggested that multi-trait plant growth promoting bacteria and co-inoculation of PGPB along with AMF could be used as effective inoculants to improve the plant growth and productivity under water deficit condition to achieve sustainable agriculture.