草业学报2016，Vol.25Issue(8)：81-90,10.DOI:10.11686/cyxb2015563
高温胁迫对黑麦草生长及生理代谢的影响
Effect of temperature stress on growth and metabolism in perennial ryegrass
摘要
Abstract
In order to investigate the effects of high temperatures on growth,leaf membrane stability,chloro-phyll content,photosynthesis,endogenous hormones and carbohydrate metabolism,two perennial ryegrass (Lolium perenne )cultivars with contrasting heat tolerance,‘Premier’(tolerant)and ‘Pinnacle’(sensitive) were selected and treated under optimum (25 ℃/20 ℃)and high (35 ℃/30 ℃)temperatures in growth cham-bers for 21 days.The results demonstrated that leaf electrolyte leakage and abscisic acid (ABA)content in-creased while plant growth,chlorophyll content,photosynthesis and endogenous hormones auxin (IAA),gib-berellin (GA3 )and cytokinin (ZR)decreased under high temperature,more so in Pinnacle than in Premier. Soluble sugars and fructans increased and subsequently decreased with prolonged temperature treatment,while starch content decreased in both cultivars under high temperature,but Premier maintained relatively high starch content compared to Pinnacle.Accumulating or maintaining high phytohormones levels,including ABA,GA3 ,IAA and ZR,and carbohydrates including soluble sugars and fructans associated with cellular os-motic homeostasis and membrane stability,delayed leaf senescence,protecting photosynthetic apparatus from heat damage and maintaining photosynthetic capacity may all contribute to heat tolerance in perennial ryegrass.关键词
多年生黑麦草/高温胁迫/内源激素/碳水化合物/耐热性Key words
perennial ryegrass/high temperature stress/endogenous hormones/carbohydrates/heat stress tol-erance引用本文复制引用
王日明,熊兴耀..高温胁迫对黑麦草生长及生理代谢的影响[J].草业学报,2016,25(8):81-90,10.基金项目
湖南省教育厅课题（09C1267）资助。 （）
