非秋眠紫花苜蓿株系优选的性状分析

Analysis to non-dormancy alfalfa character in breeding selection for excellent individuals

以产种期的非秋眠苜蓿Medicagosativa选择优株为材料,对影响株质量的性状进行通径分析。试验数据的总的多元决定系数较大,∑d=0.8467,表明试验中选择的性状包括了影响生物量的主要性状。通径分析结果表明:结实分枝数、总分枝数、株高、产种量、分枝节数和分枝结实花序数与株质量相关性相对较强,是生物产量的主要决定因素,是非秋眠苜蓿在亚热带地区进行单株选择的主要性状。分析得出的株质量多元回归方程为,y=14.3249+0.0772x1(株高)+0.1573x2(株总分枝数)+0.4834x3(株结实分枝数)+0.0112x4(花序长度)+0.0687x5(分枝结实花序数)+0.0323x6(主枝结实花序数)+0.0006x7(茎粗)+0.1702x8(分枝节数)+0.4271x9(产种量)。

Characterislics that affecled planl quality of selected non-dormancy alfalfa plants were analyzed with data collected during the seed maturing period. The muhi--recursion determination coefficient ∑d was 0. 846 7. This indicates that alfalfa biological yield is associated with almostmain charaeters, including the number of total branches and the number of branches with seeds, plant height, length of inflorescences, the number of branch knots, the number of total inflorescences with seeds per branch. The multiple regression equalion of alfalfa individual weight with the nine characters in the experiment was y （individual weight） = 14. 324 9 ＋0. 077 2x1 （plant height） ＋ 0. 157 3x2 （the number of branches） ＋0. 483 4x3 （the number of brafiehes with seeds） ＋0. 011 2x4 （length of inflorescence） ＋0.068 7x5（the number of inflorescence with seeds per branch） ＋0.032 3x6（the number of inflorescence with seeds） ＋0. 000 6x7（stem perimeter） ＋0. 170 2x8（the number of branch knots） ＋ 0. 427 1x9（seed yield）.