应用单体分析法对三个冬小麦品种(系)进行抗白粉基因定位的研究

Determination of the Chromosome Locations of the Mildew Resistance Genes of Three Winter Wheat Varieties(Lines) with Monosomic Analysis

用单体分析法对3个冬小麦品种（系）进行了基因定位研究。结果表明：小白冬麦和复壮30对白粉病的抗性，分别由1个位于1A染色体、1个位于4D染色体上的隐性基因所控制。由于1A染色体上的两个已知Pm基因Pm3和Pm17的苗期抗性均不如小白冬麦的强，也由于已知Pm基因中没有位于4D染色体上者，故认为小白冬麦和复壮30所含隐性抗白粉基因可能是新的Pm基因。结果还表明，Fr81－8所含抗白粉基因很可能是Pm4b。对于关键组合F2抗感分离比例偏离97∶3标准比例的原因亦作了分析。

The chromosome locations of the mildew resistance genes of 3 winter wheat varieties (lines) were studied with monosomic analysis. The results indicated that the mildew resistance of Little White Winter and Fuzhuang 30 were conferred each by a recessive mildew resistance gene located on chro mosomes 1A and 4D respectively. Since neither the seedling reaction of Pm3, nor that of Pm17, both lo cated on chromosome 1A, were as resistant as that of Little White Winter;and since none of the known Pm genes were located on chromosome 4D, the recessive mildew resistannce genes of Little White Winter and Fuzhuang 30 were suggested to be new Pm genes. The mildew resistance gene of Fr81-8 was found lo cated on chromosome 2A. This chromosome location, together with the pedigree that involves VPMM,indicated that the dominant mildew resistance gene carried by Fr81-8 is presumably Pm 4b. The reason of the deviation from the standard segregating ratio of the critical combinations, 97∶3, was also discussed.