草地学报2026，Vol.34Issue(1)：1-9,9.DOI:10.11733/j.issn.1007-0435.2026.01.001
盐胁迫对长穗偃麦草根系分泌有机酸的影响
Response of Root-Secreted Organic Acids in Thinopyrum ponticum to Varying Intensities of Salt Stress
摘要
Abstract
To elucidate the responses of organic acids secreted by the roots of Thinopyrum ponticum under salt stress and their interactions with root traits and rhizosphere soil physicochemical properties,a controlled experi-ment with four salinity treatments was established:control,mild,moderate and severe salt stress(with soil salt contents of 0%,0.2%,0.4%,and 0.6%w/w,respectively).Untargeted metabolomics was employed to analyze relative abundance variations and regulatory mechanisms of organic acids in root exudates.The results demonstrated that salt stress significantly decreased the secretion of organic acids including 1-hydroxy-2-naph-thoic acid,succinic acid,homogentisic acid,phenylpyruvic acid and indolelactic acid(P<0.05),while signifi-cantly enhancing the secretion of phenoxyacetic acid(P<0.05).However,no significant effects on the secre-tion of 3-hydroxybutyric acid and shikimic acid.Principal coordinate analysis(PCoA)revealed significant differ-ences in root-secreted organic acid profiles between control and salt-stressed treatments(mild,moderate and severe salinity)(P<0.05).Correlation analysis demonstrated that soil salinity,electrical conductivity,water content,and pH were key determinants influencing root organic acid secretion.Path analysis further revealed that salt stress promoted phenoxyacetic acid secretion through soil salinization-mediated suppression of root mor-phological traits.These findings provide a theoretical basis for the in-depth analysis of the physiological mecha-nisms of plant salt tolerance.关键词
盐渍化/耐盐机制/根际效应/根系分泌物Key words
Salinization/Salt tolerance mechanism/Rhizosphere effect/Root exudates分类
农业科技引用本文复制引用
张冉,杨亮,李丹,李彦颉,卢英帅,陈晓鹏..盐胁迫对长穗偃麦草根系分泌有机酸的影响[J].草地学报,2026,34(1):1-9,9.基金项目
国家自然科学基金项目(32271682)资助 （32271682）
