摘要
高温是制约杜鹃园林绿化应用的重要因子。为探讨杜鹃花属植物的高温致伤机理,该试验以杜鹃19个品种2年生扦插苗为材料,通过人工气候箱的盆栽试验,在40℃高温胁迫下测定8项生理指标。结果发现:40℃高温胁迫条件下,19个品种杜鹃的MDA含量、H2O2含量、Pro含量、可溶性糖含量以及CAT活性增加,而可溶性蛋白含量、SOD和POD活性的变化因品种而异,故不能依靠单一的指标评价品种的耐热性。通过模糊隶属函数与聚类分析对19个品种杜鹃耐热能力的综合评价,认为可将其划分为5种类型,即高度耐热型、中度耐热型、弱耐热类型、热敏感类型和高度热敏感类型。
High temperature is an important factor that restricts the application of Rhododendron sp.in landscaping.In order to explore the high temperature injury mechanism of R.sp.,19 kinds of biennial cuttings were studied through pot trial in artificial climate chamber.Eight physiological indexes were determined under 40℃high temperature stress.The results showed that the MDA content,H 2O 2 content,Pro content,soluble sugar content and CAT activity of these cultivars increased under 40℃high temperature stress while the changes of soluble protein content,SOD and POD activities varied differently.The heat resistance of the cultivars could not be evaluated by a single index.According to comprehensive evaluation of heat resistance by the fuzzy membership function and cluster analysis,19 cultivars were divided into 5 types,i.e.,highly heat tolerant type,moderately heat tolerant type,mildly heat tolerant type,heat sensitive type and highly heat sensitive type.
作者
李辉
苏家乐
李畅
肖政
何丽斯
Li Hui;Su Jiale;Li Chang;Xiao Zheng;He Lisi(Jiangsu Key Laboratory for Horticultural Crop Genetic Improvement,Institute of Leisure Agriculture,Jiangsu Academy of Agricultural Sciences,Nanjing 210014,China;College of Horticulture and Plant Protection,Yangzhou University,Yangzhou 225009,China)
出处
《江苏林业科技》
2018年第5期1-9,13,共10页
Journal of Jiangsu Forestry Science & Technology
基金
江苏省林业科技创新与推广项目"杜鹃花新品种‘蝶舞’‘蝶恋’工厂化育苗技术及应用推广"[LYKJ(2017)48]
江苏省农业科技自主创新资金项目"优新树种选育与高效栽培技术方案"[CX(16)1005]
关键词
杜鹃
耐热性
生理指标
隶属函数
聚类分析
Rhododendron sp.
Heat tolerance
Physiological index
Membership function
Cluster analysis
