Contribution of potassium solubilizing bacteria in improved potassium assimilation and cytosolic K + /Na + ratio in rice ( Oryza sativa L.) under saline-sodic conditions.

Autor:	Nawaz A; Microbial Physiology Laboratory, Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan., Qamar ZU; Rice Lab, Plant Breeding and Genetics Division, Nuclear Institute of Agriculture and Biology College, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan., Marghoob MU; Microbial Physiology Laboratory, Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan., Imtiaz M; Microbial Physiology Laboratory, Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan., Imran A; Microbial Physiology Laboratory, Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan., Mubeen F; Microbial Physiology Laboratory, Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering College, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan.
Jazyk:	angličtina
Zdroj:	Frontiers in microbiology [Front Microbiol] 2023 Aug 28; Vol. 14, pp. 1196024. Date of Electronic Publication: 2023 Aug 28 (Print Publication: 2023).
DOI:	10.3389/fmicb.2023.1196024
Abstrakt:	Sodium-induced potassium (K + ) deficiency is more prevalent in salt-affected soils. Plants experience K + starvation thus cytosolic K + /Na + ratio is lowered, which is a prerequisite for their survival. K + enrichment in crops can be acquired via K-solubilizing bacteria as a sustainable green agriculture approach. This study was conducted to explore potent K-solubilizing bacteria from the rhizosphere of wheat, rice, and native flora grown in salt-affected soils in two distinct regions of Pakistan. The aim of this work was to evaluate the contribution of microbial consortiums to the improvement of K + assimilation and cytosolic K + /Na + ratios in rice crops under saline-sodic conditions. Among 250 bacterial isolates, 9 were selected based on their salt (11% NaCl) and alkali (9) tolerance and K-solubilization indices (1.57-5.67). These bacterial strains were characterized for their plant growth-promoting traits and identified based on 16S rRNA gene sequencing. A consortium of five strains, namely, Enterobacter hormaechei, Citrobacter braakii, Pseudomonas putida, Erwinia iniecta , and Pantoea agglomerans , was used as a bio-inoculant to evaluate its role in K + assimilation, cytosolic K + /Na + ratio, and subsequent yield enhancement in rice grown under saline-sodic conditions. The impact of applied consortium on rice was assessed under variable salt levels (Control, 40, 80, and 120 mM) in a pot experiment and under natural saline-sodic conditions in the field. Plant agronomical parameters were significantly higher in the bacterial consortium-treated plants, with a concomitant increase in K + -uptake in root and shoot (0.56 and 0.35 mg g -1 dry wt.) of the salt-tolerant rice variety Shaheen. The root K + /Na + ratio was significantly improved (200% in 40 mM and 126% in 80 mM NaCl) and in the shoot (99% in 40 mM and 131% in 80 mM) too. A similar significant increase was also observed in the salt-susceptible variety Kainat. Moreover, grain yield (30.39 g/1,000 grains wt.) and biomass (8.75 g) of the rice variety Shaheen, grown in field conditions, were also improved. It can be concluded that K-solubilizing bacteria can be used as bio-inoculants, contributing to growth and yield increment via enhanced K-assimilation and cytosolic K + /Na + ratio in rice crops under salt stress. Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest. (Copyright © 2023 Nawaz, Qamar, Marghoob, Imtiaz, Imran and Mubeen.)
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu