栓皮栎优树自由授粉子代遗传变异研究

Genetic Variation of Plus Tree Open-pollinated Progenies in Quercus variabilis

对栓皮栎6个群体的4a年生优树自由授粉子代的叶片、生长性状以及过氧化物酶同工酶变异进行了分析，结果表明：苗高、叶长、叶宽、叶柄长、叶面积等性状在群体间存在极显著差异；群体内家系间苗高、地径差异显著。栓皮栎群体过氧化物酶同工酶由2个位点组成，等位基因平均数为2．479，平均期望杂合度为0．282，群体内的变异占总变异的54％。以苗高作为主要性状，从参试的57个家系中初步选择优良家系10个，其高生长量比总体平均值大31．7％～84．0％。

The variations of the leaves and growth traits as well as peroxidase of 4-year-old plus tree open- pollinated progenies from six Quercus variabilis populations were investigated. The results showed that there were significant differences in seedling height, leaf length, leaf width, petiole length, and leaf area among different populations, and in seedling height, leaf length among different families. The peroxidase isozyme of Q. variabilis consisted of two locis. The mean of alleles was2. 479 and the expected heterozy- gosity was 0. 282. Within the population, genetic variations accounted for 54% of the total genetic varia- tions. With seedling height as the main character, 10 superior families were selected preliminarily from 57 tested families. Their height growths increased by 31.7%~84.0% than the overall population average.