Halomonas ventosae JPT10 promotes salt tolerance in foxtail millet (Setaria italica) by affecting the levels of multiple antioxidants and phytohormones

Author:

Xiao Shenghui1,Wan Yiman1,Zheng Yue1,Wang Yongdong1,Fan Jiayin1,Xu Qian1,Gao Zheng1,Wu Changai1ORCID

Affiliation:

1. National Key Laboratory of Wheat Improvement, Shandong Engineering Research Center of Plant‐Microbial Restoration for Saline‐Alkali Land, College of Life Sciences Shandong Agricultural University Tai'an Shandong province China

Abstract

AbstractPlant growth‐promoting bacterias (PGPBs) can increase crop output under normal and abiotic conditions. However, the mechanisms underlying the plant salt tolerance‐promoting role of PGPBs still remain largely unknown. In this study, we demonstrated that Halomonas ventosae JPT10 promoted the salt tolerance of both dicots and monocots. Physiological analysis revealed that JPT10 reduced reactive oxygen species accumulation by improving the antioxidant capability of foxtail millet seedlings. The metabolomic analysis of JPT10‐inoculated foxtail millet seedlings led to the identification of 438 diversely accumulated metabolites, including flavonoids, phenolic acids, lignans, coumarins, sugar, alkaloids, organic acids, and lipids, under salt stress. Exogenous apigenin and chlorogenic acid increased the salt tolerance of foxtail millet seedlings. Simultaneously, JPT10 led to greater amounts of abscisic acid (ABA), indole‐3‐acetic acid (IAA), salicylic acid (SA), and their derivatives but lower levels of 12‐oxo‐phytodienoic acid (OPDA), jasmonate (JA), and JA‐isoleucine (JA‐Ile) under salt stress. Exogenous JA, methyl‐JA, and OPDA intensified, whereas ibuprofen or phenitone, two inhibitors of JA and OPDA biosynthesis, partially reversed, the growth inhibition of foxtail millet seedlings caused by salt stress. Our results shed light on the response of foxtail millet seedlings to H. ventosae under salt stress and provide potential compounds to increase salt tolerance in foxtail millet and other crops.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Publisher

Wiley

Subject

Plant Science,Ecology, Evolution, Behavior and Systematics

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