Abstract: Eight alfalfa varieties(Medicago sativa L.)introduced at home and abroad were used as test materials to compare and study the leaf characteristics,yield traits,and photosynthetic physiological properties of different varieties. Correlation analysis and throughput analysis were used to explore their correlation with yield and provide a basis for the screening of high-yielding alfalfa germplasm. The results showed that the variation of single plant dry weight of alfalfa varieties for the test was 0.88~1.21 g. The correlation between various traits and single plant dry weight was ranked in order of magnitude as follows:single leaf dry weight > specific leaf weight > transpiration rate > number of leaves per plant > leaf shape index,with single plant leaf dry weight being the most prominent leaf characteristic indicator. The degree of influence on the dry weight of a single plant was as follows in descending order:specific leaf weight > stomatal conductance > soluble protein > plant height > sucrose > soluble sugar > total chlorophyll,of which specific leaf weight was the main determinant of the dry weight of a single plant. In summary,the most important indicators for screening high-yield alfalfa germplasm were single plant dry weight and specific leaf weight. Among the 8 alfalfa varieties,‘Gannong No.9’,‘WL319HQ’ and ‘SG501’ have relatively high single-plant dry weight,single-plant leaf dry weight,and specific leaf weight,which can be studied and utilized as high-yielding germplasm in breeding work.

Key words: Alfalfa, Leaf characteristics, Light and physiology, High yield germplasm

摘要： 以国内外引进的8个紫花苜蓿（Medicago sativa L.）品种为试验材料，对比研究不同品种的叶片特征、产量性状和光合生理特性，采用相关性分析和通径分析法，探讨其与产量的关联性，以期为高产紫花苜蓿种质的筛选提供依据。结果表明：供试紫花苜蓿品种单株干重的变幅为0.88~1.21 g；各性状与单株干重的相关性按大小排序依次为：单株叶干重>比叶重>蒸腾速率>单株叶片数>叶形指数，单株叶干重是最突出的叶片特征指标。对单株干重的影响程度从大到小依次为：比叶重>气孔导度>可溶性蛋白>株高>蔗糖>可溶性糖>叶绿素总量，其中，比叶重是单株干重的主要决定因子。综上，高产紫花苜蓿种质筛选的重要指标包括：单株叶干重和比叶重，8个紫花苜蓿品种中‘甘农9号’、‘WL319HQ’和‘SG501’的单株干重、单株叶干重和比叶重均较大，可作为高产种质在育种工作中加以研究利用。

关键词: 紫花苜蓿, 叶片特征, 光合生理, 高产种质