中国苜蓿品种种子产量性状的遗传多样性

Genetic diversity of seed yield characteristics in Chinese alfalfa (Medicago sativa) varieties

在田间穴播条件下,对国内28个3龄苜蓿品种种子产量性状的遗传多样性进行了研究。结果表明绝大多数品种的种子产量及产量构成因素的品种内变异大于品种间变异.参试品种的单株种子产量平均为3.88g,变幅在0.223.4g之间;品种间变幅为1.208.00g。品种间变异占总遗传变异的14.2%37.7%,而品种内变异占总遗传变异的62.3%85.8%。参试各品种的种子产量与产量构成诸因素呈不同程度的显著正相关。绝大多数品种的实际种子产量占潜在产量的百分比小于1%。

Genetic diversity of seed yield and its components were investigated in 28 Chinese alfalfa (Medicago sativa) varieties which grew in the third year under space sowing condition. Results showed that variations of seed yield and yield components withinvariety were larger than that amongvariety in the majority of varieties tested. The average seed yield per plant among the varieties was 3.88 g and varied from 0.2~23.4 g amongvariety and 1.20~8.00 g withinvariety. There are 20 varieties in which the variation of seed yield per plant withinvariety were larger than amongvariety. The varieties with higher seed yield variations were, for instance, Xinjiangdaye (0.71~23.4 g/plant)?Longmu 801 (0.20~22.27 g/plant) and Weixian (1.00~18.69 g/plant). Number of variety with the variation of seed yield components withinvariety were bigger than that amongvariety were:22 for inflorescence/plant, 10 for flower/inflorecence, 20 for pod/fertile shoot, 22 for seed/pod, and 18 varieties for thousand seed weight. The betweenvariety variance accounted for 14.2 to 37.7% of the total genetic variance for seed yield character ,while the withinvariety variance explained from 62.3 to 85.8%. The seed yield of 28 varieties positively correlated to the seed yield components in different extents. Percentage of actual seed yield accounted for potential seed yield was less than 1% in most of varieties tested.