Field evaluation of consortium of bacterial inoculants producing ACC deaminase on growth, nutrients and yield components
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ORIGINAL RESEARCH
Field evaluation of consortium of bacterial inoculants producing ACC deaminase on growth, nutrients and yield components of rice and wheat Dinesh Chandra1,2 · Anil Kumar Sharma1 Accepted: 28 September 2020 © Korean Society of Crop Science (KSCS) 2020
Abstract Bacterial isolates Achromobacter, Ochrobactrum Pseudomonas, and Variovorax have often been isolated from plant roots, and most of them have been described as growth enhancing rhizobacteria. These rhizobacteria have been used to boost crops productivity in varied region of agro-climatic regions. To lessen the usage of chemical fertilizers inputs and improve the sustainability of rice–wheat crops, this study was planned to investigate the impacts of bacterial consortium inoculants producing 1-aminocyclopropane-1-carboxylate (ACC) deaminase on plant growth, nutrient content and grain yield in a field trial. Rice and wheat plants subjected to plant growth-promoting rhizobacteria (PGPR) consortia of strain DPC9 (Ochrobactrum anthropi) + DPB13 (Pseudomonas palleroniana) + DPB15 (Pseudomonas fluorescens) + DPB16 (Pseudomonas palleroniana) gave the best results with reference to macronutrient—nitrogen, phosphorus, potassium, calcium and sodium content and yield-related parameters including 1000 grain weight (10.2%, 40.7%), number of grains per panicle/spike (45.5%, 60.6%), and tillers (32.2%, 106.6%). This inoculants significantly increased grain yield (65.6%, 74.4%), straw yield (26.8%, 36.9%) and harvest index (14.9%, 13.8%) of rice–wheat crops, respectively, when compared to their counterpart control plants. Significant positive correlation in parameters which contribute in producing high grain yield in rice–wheat include plant height (r = 0.938, r = 0.852), tillers (r = 0.968, r = 0.881), panicle/spike length (r = 0.844, r = 0.912), number of grains per panicle/spike (r = 0.969, r = 0.815), 1000 grain weight (r = 0.833, r = 0.931), straw yield (r = 0.920, r = 0.918) and harvest index (r = 0.909, r = 0.847) and also surge nutrient enhancement in rice and wheat were observed in consortium treated plants. It can be concluded that consortium of DPC9 + DPB13 + DPB15 + DPB16-producing ACC deaminase can serve as a useful bio-inoculant for sustainable rice–wheat production in diverse agro-ecosystem. Keywords Rice–wheat cropping system · PGPR · ACC deaminase · Consortia · Nutrient
Introduction
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s12892-020-00077-y) contains supplementary material, which is available to authorized users. * Dinesh Chandra [email protected] Anil Kumar Sharma [email protected] 1
Department of Biological Sciences, CBS&H, G.B. Pant University of Agriculture and Technology, Pantnagar, 263 145 U.S. Nagar, Uttarakhand, India
GIC Chamtola, Almora, Uttarakhand 263 622, India
2
An approximately 13.5 million hectare area of IndoGangetic Plains is utilized for RWCS (rice–wheat cropping system) in south Asian countries. The proportion of this area is 10.0 million
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