细叶芒苗期耐旱性分析

摘要

为揭示细叶芒苗期的耐旱性,本试验通过盆栽土培法研究了田间最大持水量的80％(CK),60％ (LS),40％(MS)和20％(HS)对细叶芒苗期植物学特征和生理生化特征的影响.结果表明,随着干旱胁迫强度的增加,细叶芒苗期株高、绿叶面积、分蘖、生物量均下降,根冠比增加；叶片Pn、Gs、Ci浓度、Tr下降,WUE升高,Pn、Gs、Ci浓度、Tr在MS处理下与CK相比分别下降48.05％,40.86％,43.52％和65.41％,WUE增加50.21％；叶片相对含水量降低,在MS处理下与CK相比下降26.64％,Chl-a、Chl-b和Chl呈先增加后减少趋势,在MS处理下含量达到最大值,分别增加59.11％,65.64％和29.11％；MDA含量、SOD活性和Pro含量上升,在HS处理下与CK相比分别增加73.68％,95.20％和83.30％.综合分析得出细叶芒苗期对干旱环境有一定的适应性.%To assess the drought tolerance of Miscanthus sinensis ‘Gracillimu’ seedlings,the effects of 80％,60 ％,40 ％ and 20 ％ of the maximum field water holding capacity on the botanical,physiological and biochemical characteristics were assessed in a seedling incubation pot experiment.With an increase in water stress,the height,leaf area,tillering and biomass decreased but root/shoot ratio increased.Compared with the CK,under mild stress,Pn,Gs,Ci and Tr decreased by 48.05％,40.86％,43.52％ and 65.41％,respectively,while WUE increased by 50.21％.The relative leaf water content under mild stress decreased by 48.05 ％ compared with the CK,while the contents of Chl a,Chl b and total Chl increased by 59.11％,65.64％ and 29.11％,respectively,but then decreased.Under heavy stress MDA content,SOD activity and Pro content increased by 73.68％,95.20％,and 83.30％,respectively compared with the CK.Therefore M.sinensis ‘Gracillimu’ seedlings have some ability to adapt to a drought environment.