诱发突变是改良作物株形结构的有效方法。叶角(叶与茎秆之间夹角)是一个重要的株形性状。遗传分析结果表明:叶角突变性状属数量性状,但窄角性状表现部分显性。小麦旗叶及其下一叶的叶角狭义遗传力较高,分别为73%和61%,且不受栽培密度的影响,因此在育种的早期世代(M_2或 F_2)进行选择是有效的。 Mutagenesis is an effective method to improve plant shape and structure. Leaf angle (angle between leaf and stem) is an important plant-shaped trait. The results of genetic analysis showed that the leaf-tip mutation trait was a quantitative trait, but the narrow-angle trait was partially dominant. The narrow heritability of flag leaf and its next leaf tip in wheat was 73% and 61%, respectively, and was not affected by the planting density. Therefore, it was effective to select the early generations of breeding (M_2 or F_2).