白杨派内若干树种正交与反交试验的研究

STUDIES ON THE GROSSES AND RECIPROCAL CROSSES IN SECTION LEUCE

本文通过毛白杨(Populus tomentosa Carr.)、毛新杨(P.tomentosa×P.bolleana)、银灰杨(P.×canescens Smith)、银腺杨(P.alba×P.glandulo-sa)等白杨派内树种和杂种的正交与反交试验,对白杨派内正交与反交的杂交过程及其子代表现进行了对比和分析。结果表明,白杨的正交与反交在杂交过程、子代表型等方面均存在着显著差异.同时,子代表型还具有明显地偏向母本的倾向。杨树的正交与反交应被视为2个不同的杂交组合,二者不能代替。

Crosses and reciprocal crosses were made among Populus tom-entosa Carr.,P. tomentosa×p. blloeana, p, canescens Smith,and p. alba×P.glandulosa.The comparisons of hybridization process and progenies' performance between the crosses and reciprocal crosses showed that the difference between the crosses and the reciprocal crosses is significant. In addition, the performance of the progenies showed a tendency to maternal heridity.The crosses and the reciprocal crosses of poplar hybridization should be considered as two different combinations.