Halophile plant growth-promoting rhizobacteria induce salt tolerance traits in wheat seedlings(Triticum aestivum L.)  

作　　者：Maryam SAFDARIAN Hossein ASKARl Ghorbanali NEMATZADEH Adriano SOFO 

机构地区：[1]Sari Agricultural Sciences and Natural Resources University,Mazandaran Province,Sari 4818168984(Iran) [2]Department of Biotechnology,Faculty of New Technologies and Energy Engineering,Shahid Beheshti University,Tehran 198396941,(Iran) [3]Department of European and Mediterranean Cultures:Architecture,Environment,Cultural Heritage(DiCEM),Universita degli Studi dello Basilicata,Via Lanera 20,Matera 75100(Italy)

出　　处：《Pedosphere》2020年第5期684-693,共10页土壤圈（英文版）

基　　金：This work was supported scientifically by COST Action ESI406“Soil fauna-Key to Soil Organic Matter Dynamics and Modelling(KEYSOM)”.

摘　　要：Salinity is one of the most important growth-limiting factors for most crops in arid and semi-arid regions;however,the use of plant growth-promoting rhizobacteria isolated from saline soils could reduce the effects of saline stress in crops.This study aimed to evaluate the efficiency of plant growth-promoting rhizobacteria(PGPRs),isolated from the rhizosphere of halophile plants,for the growth,Na^+/K^+balance,ethylene emission,and gene expression of wheat seedlings{Triticum aestivum L.)grown under saline conditions(100 mmol L^-1 NaCl)for 14 d.A total of 118 isolates obtained from saline soils of the deserts of Iran were tested for their capacity as PGPRs.Out of the 118 isolates,17 could solubilize phosphate(Ca3(P〇4)2),5 could produce siderophores,and 16 could synthesize indole-3-acetic acid.Additionally,PGPRs were also evaluated for aminocyclopropane-l-carboxylate deaminase activity.A pot experiment was conducted to evaluate the ability of 28 PGPR isolates to promote growth,regulate Na^+/K^+balance,and decrease ethylene emissions in plants.The most efficient PGPRs were Arthrobacter aurescens.Bacillus atrophaeus,Enterobacter ashuriae,and Pseudomonas fluorescens.Gene expression analysis revealed the up-regulation of H^+-PPase,HKT1,NHX7,CAT,and APX expression in roots of Enterobacter-inocuVdied salt-stressed plants.Salt-tolerant rhizobacteria exhibiting plant growth-promoting traits can facilitate the growth of wheat plants under saline conditions.Our results indicate that the isolation of these bacteria may be useful for formulating new inoculants to improve wheat cropping systems in saline soils.

关 键 词：ethylene emission gene expression growth-promoting trait indole-3-acetic acid phosphate solubility saline soil SIDEROPHORE 

分 类 号：S512.1[农业科学—作物学]