春小麦品系‘MY002894’和‘YJ006793’成株期抗条锈病基因遗传分析

Genetic analysis of adult-plant resistance genes to stripe rust in two spring wheat lines‘MY002894’and‘YJ006793’

春小麦品系‘MY002894’和‘YJ006793’对小麦条锈病具有成株期抗性。本研究分析了这2个品系成株期抗条锈病基因遗传规律,促进其有效利用。通过‘MY002894’与‘Taichung 29’(T29)抗感杂交和‘MY002894’与‘YJ006793’抗抗杂交构建F 2∶3代分离群体,在青海省农林科学院植物保护研究所小麦条锈病自然病圃进行了两年的抗病表型鉴定。遗传分析结果显示,‘MY002894’与‘T29’F 2∶3杂交群体卡方测验符合7R∶9S的抗感分离比,表明‘MY002894’中含有2对独立作用的隐性成株期抗条锈病基因;‘MY002894’与‘YJ006793’F 2∶3群体卡方测验符合55R∶9S的抗感分离比,表明‘MY002894’与‘YJ006793’杂交F 2∶3杂交群体对条锈病的抗性由1对显性基因2对隐性基因独立控制。由于‘MY002894’中有2对独立作用的隐性成株期抗条锈病基因,推测‘YJ006793’中可能含有1对显性成株期抗条锈病基因。

Spring wheat lines‘MY002894’and‘YJ006793’possess adult-plant resistance to stripe rust.In order to promote their effective utilization,genetic analysis of adult-plant resistance genes to stripe rust in these two spring wheat lines were carried out in this study.Disease resistance phenotype of the two F 2∶3 generation segregated population,which were constructed by crossing‘MY002894’with susceptible cultivars‘Taichung 29’(T29)and‘YJ006793’,separately,were identified in two years at the natural disease nursery of Plant Protection Institute,Qinghai Academy of Agricultural and Forestry Sciences.Genetic analysis showed that chi-square test result of‘MY002894’and‘T29’F 2∶3 hybrid population met the separation ratio of 7R∶9S,indicating that‘MY002894’contained two pairs of recessive resistance genes acting independently to stripe rust.The chi-square test of‘MY002894’and‘YJ006793’F 2∶3 population conformed to separation ratio by 55R∶9S,indicating that resistance of‘MY002894’and‘YJ006793’F 2∶3 hybrid populations to stripe rust were controlled by one pair of dominant genes and two pairs of recessive genes,independently.Since‘MY002894’has two pairs of recessive adult-plant resistance genes to stripe rust,we can speculate that‘YJ006793’may contain one pair of dominant adult-plant resistance genes to stripe rust.