2，4-表油菜素内酯对盐胁迫下无芒雀麦生理特性的影响

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中图分类号：S543.9 文献标识码：A 文章编号：1007-0435（2025）11-3732-09

引用格式：，等.2，4-表油莱素内酯对盐胁迫下无芒雀麦生理特性的影响[J].草地学报，2025，33（1）：3732-3740ZHOUYi-fan，YANG Zhao，SUI Xiao-qing，etal.Effectof2，4-Epibrasinolide on the Physiological PropertiesofBromus inermis Under Salt Stress[J].Acta Agrestia Sinica，2025，33（11） ：3732-3740

Effect of 2，4-Epibrassinolide on the Physiological Properties of Bromus inermis Under Salt Stress

ZHOU Yi-fan，YANG Zhao，SUI Xiao-qing*，LANG Meng-qing，Jirge，LIU Hai-jun，YE Yi-zhen （CollgosdguaUeitKbotsdsostucat AridDesertRegion，Xijiang KeyLaboratoryofGrasslandResourcesandEcology，Urumqi830o52，Xinjiang，China）

Abstract：This study used smooth bromegrass （Bromus inermis‘Wusu No.1'） as the experimental material. The preliminary experiment selected 100mmol⋅L-1 NaCl as the salt stress，and a pot experiment was conducted.Under salt stress conditions，with foliar application of diffrent concentrations （O.O1，O.1，1 and 10 μmol⋅L-1） of 2，4-epibrassinolide （EBR）.By measuring the phenotypic traits，antioxidant enzyme activities and osmotic adjustment substance contents of smooth bromegrass seedlings，the effects of exogenous EBR on the physiological characteristics of smooth bromegrass seedlings under salt stress were explored.The results showed that 100mmol⋅L-1 NaCl salt stress significantly inhibited the plant height，leaf length and leaf area of smooth bromegrass seedlings. However，spraying EBR under salt stresscould significantly increase the activities of superoxide dismutase，peroxidase and catalase，as well as the contents of osmotic adjustment substances，and significantly reduce the content of malondialdehyde.Through comprehensive evaluation and analysis，it was determined that spraying 0.1μmol⋅L-1 EBR under NaCl salt stress could effectively promote the growth and development of smooth bromegrass seedlings and alleviate the membrane lipid peroxidation damage caused by salinity stress，thus providing atheoretical basis and reference for the enhancement of smooth brome grass’s ability to resist salt. Key words：Bromus inermis;Salt stress;2，4-epibrassinolide;Antioxidant enzymes;Osmotic adjustment

土壤盐渍化严重影响植物生长发育，是限制作物生长和产量的重要环境因素，已成为现代化农业生产所面临的严峻问题[1]。（剩余18700字）