选择固定有益等位基因 ,研究多年生黑麦草叶片长度数量性状位点 ,结果表明 :与叶长最为相关的 3个标记所表达的变异占表型总变异的 5 0 .9% (r2 ) ;在选择中如能将这 3个标记最优化地组合在一起 ,其综合共同作用有望使叶片长度延长和缩短 2 6 mm;鉴于供试材料在最初 3个世代的群体选择中所估测到叶片长度的遗传力为 0 .32 ,这样在今后的选择工作中 ,即使只使用现有的两个标记 ,其效果亦优于传统的表型选择法 The results showed that the three markers most correlated with leaf length represented 59.9% (r2) of the total variation of phenotypic variation. In the selection, if the three markers can be optimally combined, their combined effect is expected to prolong and shorten the leaf length by 26 mm. In view of the estimated leaf length of the tested materials in the population selection of the first three generations Of the heritability of 0.32, so that in the future choice of work, even if only the use of the existing two markers, the effect is also better than the traditional phenotypic selection