Comprehensive evaluation on heat tolerance of various Chinese cabbage seedlings
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摘要: 用人工气候箱中模拟高温条件,通过测定大白菜5份自交系和4份F1苗期的8个生理生化指标,采用主成分分析、隶属函数法和聚类分析综合评价大白菜的耐热性强弱。结果表明,供试材料的8个指标集约于3个主成分,累计贡献率为0.921;通过隶属函数值D评价耐热性的强弱,并利用聚类分析,将供试品种分为3类:夏秀-1、夏福2号和夏优-1为耐热类型;早杂5号、白阳、早5-1和早熟5号为中度耐热类型;020w-8、德阳01为不耐热类型。Abstract: At high temperature in a chamber under artificially controlled conditions,5 inbred lines and 4 F1 hybrids of Chinese cabbages at their seedling stage were studied for their heat tolerance. The factor analysis,subordinate function and cluster analysis were applied to evaluate the tested accessions based on the physiological and biochemical indices. The result obtained from the factor analysis indicated that the 8 indices could be characterized as 3 prinipal components,which gave an accumulative contribution rate up to 0.921. A comprehensive evaluation on the heat tolerance was performed based on the D value of subordinate function analysis. The cluster analysis classified the 9 accessions into 3 categories:(1) the highest heat tolerance accessions that included Xiaxiu-1,Xiafu-2 and Xiayou-1,(2) the intermediate accessions that included Zaoshu-5,Bai-yang,Zao5-1 and Zaoza-5,and (3) the sensitive-to-heat-stress accessions that included 020w-8 and Deyang.
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