4个小麦品种的抗白粉病遗传分析

Genetic Analysis of Resistance to Powdery Mildew in Four Wheat Cultivars

抗病品种郑 315、CP87 2 6 12和 91138 16 2 13 12 ,与感病品种豫麦 4 9号杂交的F1 代表现抗病 ,F2 代抗、感单株的分离比例为 3:1,表明这 3个品种均携带 1对显性抗病基因。N97189 2和豫麦 18号的杂交F1 代对白粉病表现高感 ,F2 代抗、感单株的分离比例为 1:3,由此推断N97189 2对白粉病的抗性由 1对隐性基因控制。

The genetics of resistance against powdery mildew (Erysiphe graminis f.sp. tritici ) in four wheat cultivars were analyzed.The F_1 plants from the cross of resistant cultivars Zheng 315,CP87-26-12,91138-16-2-13-12 and susceptible Yumai 49 were resistant to the powdery mildew.And the ratio of resistant and susceptible plants in F_2 generation fitted the expected 3 to 1.The results indicated that the resistance to powdery mildew in three cultivars was controlled by a single dominant gene.Oppositely the cross F_1 plants between N97189-2 (resistant) and Yumai 18 (susceptible) showed susceptible to the powdery mildew and the ratio of resistant and susceptible plants in F_2 generation fitted the segregation of 1 to 3.It was postulated that N97189-2 carried a single recessive and resistant gene.