【结果】单株重、株高、叶长、叶宽等性状间存在相关性。不同品种间差异主要

【结果】单株重、株高、叶长、叶宽等性状间存在相关性。不同品种间差异主要来源于单株重、球叶数和短宿茎长。单株重与产量的直接通径系数为1.225，叶宽、叶柄宽、叶球纵径和叶球横径对单球重的直接通径系数均为负值但较小，均主要通过单株重和株高起较强的正向间接效应。【结论】在选育半结球莴苣高产新品种时需着重考虑单株重、株高、叶长、最大球叶重、叶柄厚和短宿茎长等性状。

【结果】单株重、株高、叶长、叶宽等性状间存在相关性。 不同品种间差异主要来源于单株重、球叶数和短宿茎长。 单株重与产量的直接通径系数为1.225，叶宽、叶柄宽、叶球纵径和叶球横径对单球重的直接通径系数均为负值但较小，均主要通过单株重和株高起较强的正向间接效应。 【结论】在选育半结球莴苣高产新品种时需着重考虑单株重、株高、叶长、最大球叶重、叶柄厚和短宿茎长等性状。

[results] there were correlations among the traits of plant weight, plant height, leaf length and leaf width. The differences among different varieties were mainly due to the weight of single plant, the number of bulbous leaves and the length of short persistent stem. The direct path coefficient of single plant weight and yield is 1.225, and the direct path coefficient of leaf width, petiole width, leaf ball vertical diameter and leaf ball horizontal diameter to single ball weight is negative but smaller, which is mainly through the strong positive indirect effect of single plant weight and plant height. [Conclusion] it is necessary to consider the characters of single plant weight, plant height, leaf length, maximum bulb leaf weight, petiole thickness and short persistent stem length when breeding new semi heading lettuce varieties with high yield.<br>