茄子苗期若干耐低温性相关性状的遗传分析

Genetic analysis of chilling tolerance related characters of eggplant seedling

为研究茄子苗期耐低温性相关性状的遗传规律,以5个耐低温性不同的自交系为材料,按Griffing方法Ⅱ配制组合,对亲本与F1进行低温处理,调查茄子耐低温指数、株高、茎粗、叶片数、叶面积、干物质质量等指标。方差分析表明,茄子耐低温指数与株高、茎粗、叶面积、干物质质量等形态学性状差异显著,进一步分析遗传模型,上述5个性状的遗传符合加性-显性模型。耐低温指数广义遗传力达90.71%、79.59%、84.99%、78.59%、86.97%,适合于早代选择。狭义遗传力分别达37.15%、49.20%、58.97%、41.20%、49.49%。相关分析及通径分析表明株高与耐低温指数关系密切,耐低温指数与株高的相关系数达0.411,是描述茄子耐低温指数最重要的性状指标。在田间的选育过程中,选育耐低温性较强的品种应挑选植株高大的材料。

In order to study the genetic laws of chilling tolerance related traits in eggplant seedlings,according to the Griffing method II,5 materials which were in different tolerance of chilling to configure completely dial hybrid combination were selected.The parents and F1 were carried on chilling treatment,several characters such as the chilling tolerance index,plant height,stalk diameter,leaf number,leaf area,and plant dry weight were investigated.Results showed that there was significant difference in chilling tolerance index,plant height,stalk diameter,leaf area,and plant dry weight,the genetic models was analyzed in the further,the heredity of above 5 characters accorded to additive-dominant model.The generalized heritability of chilling tolerance index,plant height,stalk diameter,leaf area,and plant dry weight reaches 90.71%,79.59%,84.99%,78.59%,86.97%,which was suitable for early generation selection.The narrow heritability reaches 37.15%,49.20%,58.97%,41.20%,49.49%.Correlation analysis and pathway analysis showed that the correlation coefficient between low temperature tolerance and plant height reaches 0.411,the plant height was closely related to the chilling tolerance index,which was the most important trait for the low temperature resistance index of eggplant.In the breeding process,in order to breed varieties with strong low temperature tolerance,materials with strong vigor should be selected.