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本文以提高水稻品种IR24等对白叶枯病的抗性为材料,初步测定白叶枯病的抗性是由一对主效基因控制的。从不同亲本配组、正反交的结果看,子一代的抗性表现一般为显性或不完全显性,有的呈隐性。子一代的抗病能力与配组双亲有很大关系,正反交也有一定差异。并指出从子二代起,亲代与子代的遗传相关极显著,因此,应该从子二代开始逐株接菌进行选育,一般选择三、四代就可获得抗病的稳定株系。在抗病的基础上选育丰产性状好的株系,比较容易将抗病高产性状统一在一个材料上而达到选种的目的。
In this paper, the resistance of rice varieties IR24 to bacterial leaf blight was studied. The preliminary determination of bacterial blight resistance was controlled by a pair of major genes. According to the results of reciprocal crosses between different parents, the resistance performance of the offspring is generally dominant or not dominant, and some are recessive. The offspring ability of the offspring has a lot to do with the parents, and there are some differences between the two generations. And from the second generation onwards, the genetic relationship between parents and offspring is extremely significant, therefore, should be from the second generation of strain-inoculation strain selection, the general choice of three or four generations can get stable strains resistant. Breeding on the basis of resistance to high yield traits lines, it is relatively easy to high-yielding disease-resistant traits in a single material to achieve the purpose of selection.