甘蓝型油菜抗菌核病扩展的遗传分析

以核盘菌菌丝体接种11个油菜品种（系）的离体叶片，结果表明不同品种间病斑大小差异显著，病斑随接种后时间延长呈逻辑斯蒂曲线增长，抗、感品种之间抗病斑扩展的差异显著，条件方差分析表明，草酸浸根处理第3d到第4d，油菜抗毒素的条件广义遗传力达0．784；草酸浸叶柄处理第3d到第4d，加性方差占总方差23．1％，处理第4d到第5d加性方差下降为0，表明条件加性效应值和条件显性效应值在不同的时段是不同的。

Inheritance of resistance to Sclerotinia sclerotiorum lesion expansion in B.napus L.

Experiments with mycelial inoculation of detached leaves showed that lesion size increased with time in form of logistic curve. Lesion expansion of susceptible varieties was significantly faster than that of resistant ones. Analysis of conditional variance was first applied to genetic analysis of resistance to lesion expansion and the results showed that the existing variation of resistance between cultivars was controlled by heritable factors measured as conditional additional and conditional dominant variances. There was different conditional additional effects detected between resistance and susceptible cultivars and different conditional dominant effects between crosses. This analysis method is more sensitivity to detect heritability, for example, heritability increased by 40 percent after roots treated with oxalate when compared with that estimated by the normal variance analysis. It could reveal dynamic change of gene effects during disease development.