杉木无性系结实强度的遗传变异

Heredity and Variance of Reproduction Intensity of Chinese Fir'sClone

首次以结实强度为指标 ,评价杉木种子园无性系的结实能力 ,以利提高无性系再选择的准确性。研究结果杉木无性系结实强度具较高的重复力系数 ,单株为 0 .2 5 0～ 0 .4 77,无性系为 0 .5 0 0～ 0 .73 3 ,为中等遗传控制。无性系间 CV3 6.3 3 %～ 12 1.81% ,无性系内分株间为 2 7.2 7%～ 62 .73 % ,系间变异大于系内变异。可提高无性系结实能力评价精度和无性系再选择的可靠性。

The reproduction intensity (RI) was firistly introduced to evaluate the reproduction ability of seed gardens of Chinese fir's clones.The results showed that the RI of Chinese fir's clone had a comparatively high repetition coefficient 0.250～0.477 for a single plant and 0.500～0.733 for an asexual clone,belonging to medium genetic control.The CVs between asexual clones(36.33%～121.81%)were larger than those between plants(27.27%～62.73%)within the clone Using RI can increase the precision in evaluating reproduction ability of asexual clones and the dependence of reselection for asexual clones.