国庆小菊品种抗旱性综合评价

Drought resistance of Guoqing chrysanthemum with small inflorescences

采用盆栽方法经反复干旱处理后,测定与国庆小菊生长势和观赏性有关的11个指标,通过方差、主成分和隶属函数对多指标变量进行分析,综合评价了20个国庆小菊品种的抗旱性。结果表明:国庆小菊生长期抗旱鉴定的11个指标提取归纳为3个主成分,同时在3个主成分中筛选出根冠比胁迫指数、地下生物量胁迫指数、分枝性胁迫指数、群体花期胁迫指数、花量胁迫指数、花径胁迫指数、舌状花数胁迫指数等7个指标与国庆小菊生长期抗旱性密切相关;根据隶属函数平均值大小对20个国庆小菊品种抗旱性进行排序,将品种划分为强、中、弱3个等级,其中‘金陵娇黄’Chrysanthemum×grandiflorum‘Jinling Jiaohuang’等5个品种为抗旱性强品种,‘金陵矮黄’Chrysan-themum×grandiflorum‘Jinling Aihuang’等4个品种为抗旱性弱品种,其余11个为中等抗旱性品种。

In this study,11 indexes closely related to the growth potential and ornamental value of 20 Guoqing chrysanthemums with small inflorescences in their growth stage were measured and their drought resistance was evaluated by an analysis of variance,a principal components analysis,and a subordinate function analysis.Results of the principal components analysis showed the indexes could be classified into 3 component parts with 7 indexes closely related to drought-resistance;namely,stress indexes of root-shoot ratio,underground biomass,number of branches after topping,flowering phase of population,flowering quantity,flower diameter,and the number of ligulate flowers.Using the average of subordinate function,drought resistance was also divided into three classes.