植物对病原物的抗性包括由单基因控制的质量抗病性和由多基因控制的数量抗病性两种。
There are two kinds of disease resistance, named qualitative resistance and quantitative resistance, which are controlled by single gene and multigene, respectively.
结果表明，不同组合后代群体的抗性呈连续性分布，表现出多基因控制的数量性状遗传特征。
The results showed that the disease resistance of F 1 hybrids was continual and had quantitative character inheritance that was controlled by multiple gene.
结果如下： （1） 该群体对褐飞虱的平均抗性指数和平均受害等级均呈连续分布， 显示了数量性状的特征， 表明该群体及其亲本对褐飞虱的抗性是由微效多基因控制的数量抗性；
The results showed that:(1)160 tested RIL gave a continuous distribution in their resistance indices to BPH, indicating that the resistance in the tested rice plants to BPH belonged to polygenic type.
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