紫花苜蓿多元杂交后代优良株系的评价与筛选

通过连续两年大田对比试验,分析比较甘农3号(Medicago sativa cv. Gannong No. 3)、甘农5号(M. sativa cv. Gannong No. 5)和游客(M. sativa L. Eureka)紫花苜蓿以及多元杂交后代选育的16个株系的生产性能和品质性状的差异。采用AHP层次分析法,构造综合评价模型对供试材料的综合评价,筛选出白花1#和速生12#为最理想的优良株系,其干草产量分别为16.45、14.02 t·hm-2,生长高度分别为100.40、102.37 cm,分枝数分别为26、27个,生长速度分别为1.61、1.70 cm·d-1,茎叶比分别为0.98、0.96;粗蛋白含量分别为23.15%、21.25%,相对饲用价值分别为154.72%、145.23%。其次,速生11#、白花2#和速生15#植株高大、分枝能力强;速生5#和白花3#干草产量高、茎叶比小、粗蛋白含量丰富,以上株系综合评价结果良好,均可作为较好的苜蓿育种材料。

Evaluation and selection of excellent lines after polycross of alfalfa

In the present study, the production performance and quality traits of 3 alfalfa cultivars (Gannong No.3, Gannong No.5 and Eureka) and their offspring after polycross were evaluated by two consecutive year sfield test. White flower 1# and Fast-growing 12# were the best lines with the hay yield of 16.45 and 14.02 t·ha-1, plant height of 100.40 and 102.37 cm, branch numbers of 26 and 27, growth rates of 1.61 and 1.70 cm per day, stem-leaf ratio of 0.98 and 0.96, crude protein of 23.15% and 21.25%, and relative feeding value of 154.72% and 145.23%, respectively. Fast-growing 11#, White flower 2# and Fast-growing 15# had higher plant height and better branching ability and Fast-growing 5# and White flower 3# had higher hay yield, smaller stem-leaf ratio and rich crude protein. The lines mentioned above were better which can be used for further alfalfa breeding after comprehensive evaluation.