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以多年鉴定具有慢白粉抗性的小麦品种鲁麦21和感白粉病品种京双16及其杂交组合F2:3和F2:4代株系200个为材料,于2005—2007年连续2个生长季,在北京和安阳两地分别进行田间病害鉴定,并采用质量性状和数量性状2种分析方法估算鲁麦21的慢病基因数目和遗传力。结果表明,在这2个群体中至少存在4对抗性基因,其广义遗传力为0.53～0.78。由于出现超亲分离,因此推测京双16可能贡献1对微效抗病基因,而鲁麦21至少含有3对慢白粉病抗性基因。
A total of 200 wheat cultivars, Lumai 21, susceptible cultivars with white powdery mildew resistance, Jingshuang 16 with susceptible susceptible powdery mildew and its crosses F2: 3 and F2: 4 were used as materials for years, and grown continuously for two years from 2005 to 2007 The field tests were conducted in Beijing and Anyang respectively. The quality traits and quantitative traits were used to estimate the number of slow-disease genes and heritability in Lumai 21. The results showed that there were at least 4 resistance genes in these two populations, with a generalized heritability of 0.53 ~ 0.78. Due to the occurrence of super-pro-segregation, it was speculated that Jingshuang 16 could contribute to one pair of microsatellite resistance genes, whereas Lumai 21 contained at least three pairs of genes for the resistance to powdery mildew.