The Mechanisms of Sodium Chloride Stress Mitigation by Salt-Tolerant Plant Growth Promoting Rhizobacteria in Wheat

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Title:	The Mechanisms of Sodium Chloride Stress Mitigation by Salt-Tolerant Plant Growth Promoting Rhizobacteria in Wheat
Authors:	Huang, Zhen Wang, Chen Feng, Qing Liou, Rey-May Lin, Ying-Feng Qiao, Jinhua Lu, Yaxin Chang, Yuan
Contributors:	Qilu University of Technology Chia Nan University of Pharmacy & Science, Development Centre of Ecological Engineering and Technology
Keywords:	acc deaminase soil salinization bacteria metabolism salinity ethylene
Date:	2022
Issue Date:	2023-12-11 13:55:58 (UTC+8)
Publisher:	MDPI
Abstract:	We investigated the growth-promoting mechanism of salt-tolerant plant growth promoting rhizobacteria (ST-PGPR) in wheat under sodium chloride (NaCl) stress by measuring the growth and physiological and biochemical responses of wheat plants inoculated with ST-PGPR under 0-400 mM NaCl. The results showed that ST-PGPR plays a significant role in the growth of wheat under NaCl stress. Under 300 mM NaCl, wheat plants inoculated with the three ST-PGPR strains increased in plant height, root length, dry weight, and fresh weight by 71.21%, 89.19%, 140.94%, and 36.31%, respectively, compared to the control group. The proline and soluble sugar contents of wheat inoculated with Bacillus thuringiensis increased by 38.8% and 21.4%, respectively. The average content of antioxidant enzymes increased by 13.89%, and compared with the control, in wheat inoculated with the three species of ST-PGPR, the average content of ethylene decreased 2.16-fold. In addition, a mathematical model based on the interaction equation revealed that the best results of mixed inoculation were due to the complementary strengths of the strains. The analysis of experimental phenomena and data revealed the mechanisms by which Brevibacterium frigoritolerans, Bacillus thuringiensis, and Bacillus velezensis alleviate NaCl stress in wheat: (1) by lowering of osmotic stress, oxidative stress, and ethylene stress in wheat and (2) by using root secretions to provide substances needed for wheat. This study provides a new approach for the comprehensive understanding and evaluation of ST-PGPR as a biological inoculant for crops under salt stress.
Relation:	AGRONOMY-BASEL, v.12, n.3, pp.543
Appears in Collections:	[Dept. of Environmental Engineering and Science (including master's program)] Periodical Articles

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