西北农业学报2025，Vol.34Issue(9)：1677-1684,8.DOI:10.7606/j.issn.1004-1389.2025.09.011
外源茉莉酸甲酯对盐胁迫酸枣幼苗的生理影响
Physiological Effects of Exogenous Methyl Jasmonate on Jujube Seedlings under Salt Stress
摘要
Abstract
The study aims to investigate the effects of externally applied methyl jasmonate(MeJA)on the growth and physiological characteristics of jujube seedlings under salt stress,with a preliminary analysis of the optimal concentration and mechanism of MeJA in enhancing the salt tolerance of ju-jube.After a 10-day treatment with 150 mmol/L NaCl,MeJA at concentrations of 0,100,200,400,800 pmol/L was sprayed to analyze the changes of growth,photosynthetic parameters,and physiological indexes of jujube seedlings.Under salt stress,the height,root length,and relative water content of ju-jube seedlings were suppressed,and the chlorophyll content,net photosynthetic rate,stomatal conduct-ance,and transpiration rate of leaves were reduced,while the inter-cellular CO2 concentration was ele-vated.The activities of antioxidant enzymes,including SOD,POD and CAT,as well as the levels of malondialdehyde,osmoregulatory substances proline,soluble sugar,and reducing components fla-vones,and polyphenols,were elevated.Exogenous MeJA alleviated the adverse effects of salt stress on the growth and photosynthetic efficiency of jujube seedlings,by increasing the activities of antioxidant enzymes and the levels of osmoregulators and reducing substances,which showing a trend of first in-crease and then decrease with the increase in MeJA.The best effect was achieved at 200 μmol/L Me-JA.Exogenous MeJA can enhance the photosynthetic efficiency,osmoregulation ability,and antioxi-dant enzyme defense function of jujube seedlings under salt stress,effectively alleviating the growth inhibition caused by salt stress and enhancing the salt tolerance of plants.关键词
酸枣实生苗/盐胁迫/茉莉酸甲酯/生理指标Key words
Jujube seedlings/Salt stress/Methyl jasmonate/Physiological indexes引用本文复制引用
梁含云,李先宽,王广苹,陈佳宁,张坚..外源茉莉酸甲酯对盐胁迫酸枣幼苗的生理影响[J].西北农业学报,2025,34(9):1677-1684,8.基金项目
天津市科技计划(23ZGCXQY00060) Tianjin Science and Technology Program Project(No.23ZGCXQY00060). （23ZGCXQY00060）
