Overwintering rates,seedling habits,SOD activity,and five other physio-biochemical indicators in 103 F2 populations of a winter rapeseed (Brassicarapa)cross between Longyou 7 and Longyou 9 were studied using variance analysis,correlation analysis,cluster analysis and path analysis.The frequency of all indicators (except SOD)activity in the F2 populations was approximately normally distributed but with a slight skew.A tremendous transgressive segregation for all indicators was observed in the populations.At a cluster distance of 3.58,F2 populations were divided into eight groups,with great genetic differences.Correlation analysis showed that all indicators had significant differences in overwintering rates.The path coefficient and correlation coefficient between all indicators and overwintering rate were consistent,but the explanation of their relation-ships were better explained by the path coefficient.Through path analysis,the relative importance in descend-ing order of B. rapa winter survival rate was:Seedling habits,SOD activity,MDA content,free proline con-tent,POD activity,CAT activity,and soluble protein content.Seedling habits directly impacted winter surviv-al rates,and the influence reached 79.8%,but CAT activity was mainly through indirect effects and the indi-rect affect rate was 68.7%,with the rest of the indexes co-acting through both direct and indirect effects. These results provide useful information for quantitative trait loci (QTL)mapping.
国家科技期刊平台
NSTL
万方数据
维普
