【摘要】 本文以不同多基因抗性背景的 Ht 等基因系为材料,采用双因子互作试验设计,从病斑数,病斑大小和单位面积产孢量的角度,研究了单基因抗性与多基因抗性的交互作用。结果表明,在上述三个方面,两种抗性的互作效应不同程度的存在。在病斑数方面,Ht 基因表现了增加病斑数的效应,但在高抗的多基因背景中这种效应并不明显。就病斑大小而言。背景基因型通过修饰基因或微效多基因影响了抗病单基因的表达。单基因抗性与高抗多基因背景相结合的组合在病斑数、病斑大小和单位面积产孢量方面均表现了显著的抗病作用。更多还原

【Abstract】 From the number aud the size of lesion and the quantities of sporula-tion,the interaction of monogenic and polygenic resistance to H.turci-cum was studied with Ht isogenic lines.The results have indicated thatin the three aspects above-mentioned,there exists different interactionbetween monogenic and polygenic resistance.The Ht gene shows the effectof increase in the numbers of lesion,but this is indistinctive at thehigh resistant polygenic background.When the size of lesion is concerned,the inbred genotype will affect the expression of the resistant monogeneby modifying factors and polygenes.When the resistant monogene is in-corporated into the highly resistant polygenic background,the most effe-ctive resistance will be found in the number and size of the lesion aswell as the quantities of sporulation.更多还原