不同基因型花椰菜苗期耐热性指标筛选及综合评价

以17份不同基因型花椰菜幼苗为试材,研究高温胁迫对花椰菜的3个农艺性状和6个生理指标的影响,采用主成分分析、系统聚类分析和隶属函数法等综合评价花椰菜的耐热性.结果表明,9个单项指标集约于5个主成分,累计贡献率为0.877,通过隶属函数值D评价耐热性的强弱,并利用聚类分析将17份不同基因型花椰菜分为3类:第Ⅰ类是耐热类型...

Heat Tolerance of Seventeen Cauliflower Genotypes

Seventeen cauliflower genotypes were subjected to heat stress to study the effects on 3 agronomical and 6 physi-biochemical traits.Using the principal component analysis,subordinate function and system clustering analysis on these 9 traits,heat tolerance of the genotypes was evaluated.The principal component analysis indicated that the 9 indices could be characterized into 5 factors with an accumulative contribution rate of up to 0.877.Based on the D value of subordinate function analysis,the 17 genotypes were divided into 3 clusters by system clustering analysis.The most heat tolerant genotype was H1-3Y-H,the medium tolerant genotypes were ZF1-H,14,A-1×18-3,18-2-2-4s,143-4-1-1-5-4s,A-4×22-2,A-2×5H1-2,H1♂-2Y,142-2-5 and A3×A19-2,and the lest tolerant genotypes were B-1×H-1-3-2,C-5×19-1,C-1×196-6,A6×A19-2,C-5×19-1×A36-5 and B-2×10-2.The selection and evaluation methods developed in this study provided a useful tool for further study on heat tolerance and breeding of cauliflowers.