【摘要】 为了构建青梗不结球白菜耐热性评价体系并筛选出耐热性品种,以19份青梗不结球白菜作为试材,经高温胁迫5 d后测定幼苗的15个生长生理指标,运用主成分分析、聚类分析以及回归分析等多元统计分析方法对各品种的耐热性进行综合评价。结果表明:利用主成分分析将原有的15个生长和生理指标转化为6个独立的综合指标,其累计贡献率达到83.179%;基于耐热性综合评价对其进行聚类分析,将19份青梗不结球白菜分为3类,第一类为强耐热性品种:青11、青16、青13、青9、青18;第二类为中耐热性品种:青19、青4、青7、青5、青14、青12、青15、青6、青2;第三类为弱耐热性品种:青10、青8、青1、青3、青17。通过逐步回归分析建立青梗不结球白菜耐热性评价的数学模型D=?0.349?0.063×(RR)+0.163×(FW)+0.222×(SI)+0.394×(TC)+0.033×(AA)+0.137×(Pr)+0.159×(SS)?0.091×(CII),结合田间鉴定结果,青13、青11、青9、青16、青18可在海南夏秋季种植。更多还原

【Abstract】 The disease index and 15 physiological and biochemistry indexes of 19 green stem pakchoi cultivars were measured and analyzed by multivariate statistical analysis methods such as principal component analysis,cluster analysis and regression analysis to evaluate the genetic diversity of heat-resistance evaluation system of green stem pakchoi.The 15 indexes were grouped into 6 principal components with cumulative contributive rate 83.179% by principal component analysis.The varieties were divided into 3 categories based on cluster analysis of comprehensive evaluation of heat resistance would.Qing 11,Qing 16,Qing 13,Qing 9,Qing 18 were in the first category,Qing 19,Qing 4,Qing 7,Qing 5,Qing 14,Qing 12,Qing 15,Qing6,Qing 2 was in the second category,and Qing 10,Qing 8 Qing 1,Qing 3,Qing 17 was in the third category.The mathematical model for evaluating the heat tolerance of green stem pakchoi was established by stepwise regression analysis;D=?0.349?0.063×(RR)+0.163×(FW)+0.222×(SI)+0.394×(TC)+0.033×(AA)+0.137×(Pr)+0.159×(SS)?0.091×(CII).Combined with field identification results,Qing 13,Qing 11,Qing 9,Qing 16 and Qing 18 can be planted in Hainan in summer and autumn.更多还原