关键词: 紫花苜蓿, 叶片特征, 光合生理, 高产种质

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