马尾松人工群体交配系统研究

RESEARCH ON MATING SYSTEMS IN MAN-MADEPOPULATIONS OF MASSON PINE

借助水平淀粉凝胶电泳同工酶分析方法，研究了马尾松一无性系种子园，该种子园附近一人工林，马尾松－优树收集区的交配系统。研究结果表明，该种子园的多位点异交率为：０．７９２（ＳＥ＝０．０６２），种子园中心区与边缘区的多位点异交率分别为：０．８０１（ＳＥ＝０．０７５），０．８００（ＳＥ＝０．０６７）；种子园附近人工林的多位点异交率为：０．８２１（ＳＥ＝０．１８８），优树收集区的多位点异交率为：０．４３１（ＳＥ＝０．１３１）。说明该马尾松种子园的异交率较低，这可能成为影响种子园种子产量和种子质量的一个制约性因子。文章讨论了影响群体交配系统的主要因子，分析了马尾松异交率较低的可能原因，并对这一方面的进一步研究提出了一些建议。

Mating systems in three populations of Masson pine (Pinus massonina Lamb.) , including a clonal seed orchard, a plantation near the seed orchard and a clone bank were studied by isozyme analysis with the help of level starch gel electrophoresis. The results were as follows, the multi - locus estimate of outcrossing rate (tm) of the seed orchard was 0.792 (se= - 0.062) (standard errors in parenthesis): the outcrossing rates (ti) of clones in the central blocks and in the .fringal blocks were 0.80l (.e - 0.075) and 0.800 (se= - 0.067) , respectively: the estimate of tm for the plantation near the seed orchard was 0.82l (se-0.188), while in the clone bank the . was 0.431 (.e-0.l3l). lt indicated that the outcrossing rates in this seed orchard were lower, which might be an important obstacle to increase the quantity and quality of seed. The paper discussed the main factors affecting the mating systems of populations. lt analyzed the probable reasons for the low outcrossing rates of Masson pine and pres- ented some suggestion for further studies in this area.