小麦持久抗条锈品种斯汤佩利的遗传机制研究

对持久抗条锈小麦品种斯汤佩利进行了抗条锈特点研究和抗性遗传分析.斯汤佩利反应型0～1型,普遍率、严重度和病情指数3个抗性组分及其平均日变化率都很低,与三类对照品种之间有极显著差异.与中抗-中感为特征的、抗性由多基因或由主效基因与多基因共同控制的一般持久抗病品种相比,属于典型特例.其抗条锈性由2对显性基因互补控制,干尖性状由1对显性基因控制,二者之间不连锁,因此,干尖不能作为斯汤佩利抗锈性的辅助选择标记.

Resistant Characteristics to Stripe Rust and Genetic Analysis of Durable Resistance on Wheat Cultivar N. strampelli

N. strampelli, a wheat cultivar imported from Italy, has kept resistance to stripe rust for 31 years and grown on large area in southern of Gansu province, where is the most important summer-survival region of Puccinia striiformis West in China and the ideal region to identify the resistance to stripe rust of wheat cultivars. With a infected type of 0- 1, its incidence, severity, disease index and their average change rate were very low, having distinct difference from the three type of check cultivars. N. strampelli was one of the unwonted typical types compared to many durable resistance cultivars which generally bore an infected type of 3- 4 and the resistance controlled by polygenes or major-gene and polygenes together. According to phenotypes of the parents, F1 and F2 progeny, we concluded that its resistance was controlled by the complementary action of two dominant genes and its leaf tip necrosis was controlled by one domant gene. No linkage was existed between stripe rust resistance and leaf tip necrosis. Therefore, leaf tip necrosis can not be used as modal marker of resistance for assistant selection on N. strampelli.