油松单亲子代苗期生长性状遗传分析

对陕西省3个油松Pinus tabulaeformis种子园和1个优良种源区的优树单亲子代苗期生长性状进行了研究分析.结果表明:油松林分、家系间具有丰富的遗传变异,家系方差分量大于林分;不同种子园和同一种子园的不同家系苗期生长差异均达极显著水平,生长最好的家系比生长最差的家系苗高生长大1倍以上;油松家系种子千粒质量之间变异较大,变异幅度为20.04～65.10 g,种子千粒质量与地径相关紧密而与苗高相关一般;油松苗高和地径的遗传力较高,运用生长量指数,评选46个优良家系,可获得苗高和地径16.32%～27.86%和6.39%～23.08%的遗传增益,增产效果十分显著.表7参12

Genetic variation of seedling growth traits of open-pollination families of Pinus tabulaeformis

The analysis of seedling growth traits from open-pollination families from 3 seed orchards and 1 superior provenance of Pinus tabulaeformis was made in Shaanxi Provence. The results indicated that stands and families exited abundant genetic variation and the variance components of families were more than those of stands. Families in different seed orchards and different families in same seed orchard had highly significant difference in height and diameter. The height growth of the best family progeny was one time more than the worst one. There were significantly difference among the 1 000-seed weights and the range of variation were 20.04 - 65.10 g. 1 000-seeds weight were close correlations with diameter but light correlations with seedling height. Through meritability of diameter and height were very high. Through using growth index, there were 46 excellent families be selected primarily and the expected genetic gains of height and diameter were 16.32% - 27.86% and 6.39% - 23.08% respectively. The selection effect was very striking. Ch, 7 tab. 12 ref. ]