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Mechanisms on salt tolerant of Paenibacillus polymyxa SC2 and its growth-promoting effects on maize seedlings under saline conditions

文献类型： 外文期刊

作者： Wang, Chengqiang 1 ; Pei, Jian 1 ; Li, Hui 1 ; Zhu, Xiuling 1 ; Zhang, Yanan 1 ; Wang, Yanjun 4 ; Li, Wenjie 1 ; Wang, Zhongyue 1 ; Liu, Kai 1 ; Du, Binghai 1 ; Jiang, Juquan 3 ; Zhao, Dongying 1 ;

作者机构： 1.Shandong Agr Univ, Coll Life Sci,Shandong Key Lab Agr Microbiol, Shandong Engn Res Ctr Plant Microbia Restorat Sali, Natl Engn Res Ctr Efficient Utilizat Soil & Fertil, Tai An 271018, Peoples R China

2.Dezhou Univ, Coll Life Sci, Dezhou 253023, Peoples R China

3.Northeast Agr Univ, Coll Life Sci, Dept Microbiol & Biotechnol, Harbin 150030, Peoples R China

4.Shandong Acad Agr Sci, Inst Wetland Agr & Ecol, Jinan 250100, Peoples R China

关键词： Paenibacillus polymyxa; Salt -tolerance; Transcriptome; Maize

期刊名称：MICROBIOLOGICAL RESEARCH （ 影响因子：6.7； 五年影响因子：7.1 ）

ISSN： 0944-5013

年卷期： 2024 年 282 卷

页码：

收录情况： SCI

摘要： Soil salinity negatively affects microbial communities, soil fertility, and agricultural productivity and has become a major agricultural problem worldwide. Plant growth-promoting rhizobacteria (PGPR) with salt tolerance can benefit plant growth under saline conditions and diminish the negative effects of salt stress on plants. In this study, we aimed to understand the salt-tolerance mechanism of Paenibacillus polymyxa at the genetic and metabolic levels and elucidate the mechanism of strain SC2 in promoting maize growth under saline conditions. Under salt stress, we found that strain SC2 promoted maize seedling growth, which was accompanied by a significant upregulation of genes encoding for the biosynthesis of peptidoglycan, polysaccharide, and fatty acid, the metabolism of purine and pyrimidine, and the transport of osmoprotectants such as trehalose, glycine betaine, and K+ in strain SC2. To further enhance the salt resistance of strain SC2, three mutants (SC2-11, SC2-13, and SC2-14) with higher capacities for salt resistance and exopolysaccharide synthesis were obtained via atmospheric and room-temperature plasma mutagenesis. In saline-alkaline soil, the mutants showed better promoting effect on maize seedlings than wild-type SC2. The fresh weight of maize seedlings was increased by 68.10% after treatment with SC2-11 compared with that of the control group. The transcriptome analysis of maize roots demonstrated that SC2 and SC2-11 could induce the upregulation of genes related to the plant hormone signal transduction, starch and sucrose metabolism, reactive oxygen species scavenging, and auxin and ethylene signaling under saline-alkaline stress. In addition, various transcription factors, such as zinc finger proteins, ethylene-responsive-element-binding protein, WRKY, myeloblastosis proteins, basic helix-loop-helix proteins, and NAC proteins, were up-regulated in response to abiotic stress. Moreover, the microbial community composition of maize rhizosphere soil after inoculating with strain SC2 was varied from the one after inoculating with mutant SC2-11. Our results provide new insights into the various genes involved in the salt resistance of strain SC2 and a theoretical basis for utilizing P. polymyxa in saline-alkaline environments.

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