Prospective evaluation of individual and consortia plant growth promoting rhizobacteria for drought stress amelioration
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Prospective evaluation of individual and consortia plant growth promoting rhizobacteria for drought stress amelioration in rice (Oryza sativa L.) Bhawana Joshi & Anita Chaudhary P. Anil Kumar
&
Harjodh Singh &
Received: 20 April 2019 / Accepted: 30 September 2020 # Springer Nature Switzerland AG 2020
Abstract Aim Rice (Oryza sativa L.) being the most important crop for human population in Asia region, accounts for 23% of the world’s caloric intake. Due to the changing climatic conditions, the agricultural crops are experiencing vagaries of the weather more frequently leading to yield losses and even crop failure. The objective of this study was to find out a suitable consortium of bacterial inoculants which can make the crop resilient to drought stress. Methods Bacterial isolates from different habitats were characterized for salt tolerance and multiple plant growth promoting traits. Four separate treatments were formulated, with two treatments having individual bacterial strain as PGPR and the rest two having consortia of three bacterial isolates as PGPR. High yielding variety MTU1010 was selected for pot experiments and
treated with individual as well as consortium of isolates. Drought was imposed for 10 days to different batch of the rice crop (variety MTU1010) at two stages of crop growth i.e., pre-flowering and flowering stages. Results Results indicated amelioration of drought stress with higher biomass accumulation, increased grain yield and reversal of stress indicators in plants inoculated with PGPR. The antioxidant enzyme activity of SOD, CAT, and GPOX declined by 24%, 20.5% and 20% in plants treated with bacterial inoculum as compared to uninoculated control. Conclusions This study indicates that the plant beneficial microorganisms can be used to induce systematic tolerance to rice plants under drought stress and furthermore, application of consortium of PGPR has better probability to improve the coping capacity of the plants exposed to stress conditions.
Responsible Editor: Stéphane Compant
Keywords Endophytes . Exopolysaccharides . Antioxidant enzyme . TBARS . Drought tolerance
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11104-020-04730-x) contains supplementary material, which is available to authorized users. B. Joshi : A. Chaudhary (*) Centre for Environment Science and Climate Resilient Agriculture, Indian Agricultural Research Institute, New Delhi 110012, India e-mail: [email protected] e-mail: [email protected] H. Singh : P. A. Kumar CSIR-Institute of Microbial Technology, Chandigarh 160036, India
Introduction Currently, agriculture sector across the globe is facing major challenge not only from the burgeoning population, which is predicted to increase beyond 8 billion by 2030, but also from the changing climate mainly in terms of global warming and changes in rainfall rate (Foley et al. 2011; Smol 2012). For the last 4–5 years, India is witnessing a sharp rise in weather-related calamities (such as surge in
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