外源乙硫氨酸对盐胁迫下高羊茅的缓解效应  

Mitigation effect of ethionine on tall fescue under salt stress

作　　者：江生泉[1] 薛正帅[1] 李晨[1] 汤士勇[1] 杨志民 JIANG Sheng-quan;XUE Zheng-shuai;LI Chen;TANG Shi-yong;YANG Zhi-min(Food and Environmental Engineering Department,Chuzhou Vocational and Technical College,Chuzhou 239000,China;College of Grass,Nanjing Agricultural University,Nanjing 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：《云南大学学报（自然科学版）》2020年第1期179-186,共8页Journal of Yunnan University(Natural Sciences Edition)

基　　金：2019年安徽省高校优秀青年人才重点项目(gxyq2019130);2019年安徽省高校科研重点项目(KJ2019A1128);2018年省级校企合作实践教育基地(2018sjjd099);校级科技创新团队(YJCXTD-2017-01)

摘　　要：为探寻乙硫氨酸对盐胁迫下高羊茅(Festuca arundinacea)的缓解效应,采用盆栽控盐法和随机区组设计,研究了不同浓度乙硫氨酸对高羊茅草坪草耐盐性的影响.结果表明,喷施外源乙硫氨酸能显著提高盐胁迫下高羊茅草坪质量、相对生长速率,提高了叶片的光化学效率、叶绿素含量和渗透势,降低电解质渗漏率,差异均达到显著水平(P<0.05).在盐胁迫14 d后,不同浓度乙硫氨酸的草坪质量、相对生长速率、光化学效率、渗透势、电解质渗透率存在显著性差异(P<0.05),以喷施300 mg/L乙硫氨酸的缓解效应最好,但不同浓度乙硫氨酸处理的叶绿素含量差异不显著(P>0.05).相关性分析表明,盐胁迫下光化学速率与草坪质量、相对生长速率呈现显著正相关(P<0.05),相关系数分别为0.848、0.806;渗透势与草坪质量、相对生长速率也呈现显著正相关(P<0.05),相关系数分别为0.867、0.884;电解质渗透率与草坪质量、相对生长速率呈现负相关(P<0.05),相关系数分别为-0.831、-0.865,但叶绿素含量与高羊茅的草坪质量、相对生长速率相关性不显著(P>0.05).因此可用光化学速率、渗透势、电解质渗透率指标衡量盐胁迫下高羊茅的草坪质量和相对生长速率.以上结论为乙硫氨酸缓解高羊茅盐胁迫效应及抗盐机理提供了理论基础及技术途径.In order to explore the alleviating effect of ethionine on tall fescue(Festuca arundinacea)under salt stress,the effects of different ethionine concentrations on salt tolerance of tall fescue turf grass were studied with pot salt control method and random block design.The results showed that application of ethionine could significantly improve the quality and relative growth rate of tall fescue under salt stress,the photochemical efficiency,chlorophyll content and osmotic potential of leaves were increased,and the electrolyte leakage rate was decreased.The difference was significant(P<0.05).After 14 days of salt stress,there was significant difference in turf quality,relative growth rate,photochemical efficiency,osmotic potential and electrolyte permeability among different concentrations of ethionine(P<0.05).The mitigation effect of spraying 300 mg/L ethionine was the best,but there was no significant difference in chlorophyll content among different concentrations of ethionine(P<0.05).The correlation analysis showed that the photochemistry rate was positively correlated with turf quality and relative growth rate under salt stress(P<0.05),and the correlation coefficients were 0.848 and 0.806,respectively.The osmotic potential was positively correlated with turf quality and relative growth rate(P<0.05),and the correlation coefficients were 0.867 and 0.884,respectively.There were negative correlations between electrolyte permeability and turf quality and relative growth rate(P<0.05),with correlation coefficients of-0.831 and-0.865,respectively,while the chlorophyll content was not significantly correlated with turf quality and relative growth rate of tall fescue(P>0.05).Therefore,the turf quality and relative growth rate of tall fescue under salt stress can be measured by photochemical rate,osmotic potential and electrolyte leakage.It is concluded that the theoretical basis and technological approaches for ethionine on alleviating salt stress and the mechanism of salt resistance of tall fescue were provided.

关 键 词：乙硫氨酸 高羊茅 草坪质量 盐胁迫 

分 类 号：S688.4[农业科学—观赏园艺]