外源水杨酸对盐胁迫高羊茅生长和生理的影响  

Effects of exogenous salicylic acid on growth and physiology of tall fescue under salt stress

作　　者：江生泉[1] 薛正帅[1] 梁建军[1] 杨志民 JIANG Shengquan;XUE Zhengshuai;LIANG Jianjun;YANG Zhimin(Food and Environmental Engineering Department,Chuzhou Vocational and Technical College,Chuzhou,Anhui 239000,China;College of Grass,Nanjing Agricultural University,Nanjing,Jiangsu 210095,China)

机构地区：[1]滁州职业技术学院食品与环境工程系,安徽滁州239000 [2]南京农业大学草业学院,江苏南京210095

出　　处：《湖南农业大学学报（自然科学版）》2021年第2期166-170,共5页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：安徽省教育厅优秀青年人才重点项目(gxyq2019130);安徽省教育厅重点项目(KJ2019A1128)。

摘　　要：采用盆栽控盐方法,探究250 mmol/L NaCl胁迫下不同浓度(0.3、0.6、0.9 mmol/L)水杨酸对高羊茅生长和生理特性的影响。结果表明:水杨酸(SA)能提高盐胁迫下高羊茅的相对生长速率,处理15 d时,0.6 mmol/L SA处理的高羊茅相对生长速率分别比不施加SA、施0.3、0.9 mmol/L SA提高92.7%、54.9%和46.3%;喷施水杨酸能提高盐胁迫下高羊茅叶片的相对含水量,其中以0.6 mmol/L SA处理最高;0.6 mmol/L SA处理的高羊茅叶片的电解质渗漏率最小,分别比不施加SA、施0.3、0.9 mmol/L SA处理降低27.4%、11.4%和9.0%;0.6 mmol/L SA处理的高羊茅叶片叶绿素含量最高;水杨酸处理25 d时,0.6 mmol/L SA处理的丙二醛含量较不施加SA处理降低了20.63%;0.6 mmol/L和0.9 mmol/L SA处理的H2O2含量最低,比不施加SA处理分别降低了17.95%和15.38%;0.6 mmol/L SA处理的SOD和APX活性比不施加SA的分别提高155.56%和77.38%。综合以上各指标的变化,以喷施0.6 mmol/L水杨酸缓解高羊茅盐胁迫的效果最佳。The effects of different concentrations of salicylic acid(0.3,0.6,0.9 mmol/L)on the growth and physiological characteristics of tall fescue under 250 mmol/L NaCl stress were studied by pot experiment.The results showed that salicylic acid(SA)could increase the relative growth rate under salt stress,and the relative growth rate with 0.6 mmol/L SA for 15 d was 92.7%,54.9%and 46.3%higher than that in treatments without SA,with 0.3 mmol/L SA and with 0.9 mmol/L SA,respectively.Spraying SA could increase the relative water content of leaves under salt stress,and the treatment of 0.6 mmol/L SA showed the highest water content.The electrolyte leakage rate in treatment with 0.6 mmol/L SA was the lowest,which was 27.4%,11.4%and 9.0%lower than that in the treatments without SA,with 0.3 mmol/L SA and with 0.9 mmol/L SA,respectively.The content of chlorophyll with 0.6 mmol/L SA was the highest.After 25 d of SA treating,the MDA content in 0.6 mmol/L SA treatment was 20.63%lower than that in treatment without SA.The content of H2O2 in 0.6 mmol/LSA and 0.9 mmol/L SA treatments was the lowest,which was respectively 17.95%and 15.38%lower than that in treatment without SA.The SOD and APX activities of 0.6 mmol/L SA treatment were respectively 155.56%and 77.38%higher than that in treatment without SA.According to the changes of the above indexes,the effect of 0.6 mmol/L SA is the best to alleviate salt stress.

关 键 词：高羊茅 水杨酸 盐胁迫 生长和生理 

分 类 号：S688.4[农业科学—观赏园艺]