尾叶桉家系自由授粉子代性状的分析

The Character Analysis of Eucalyptus urophylla Family Progenies by Open Pollination

对尾叶桉39个子代生长性状、形质性状进行差异分析和遗传分析,结果表明:各性状历年观测数据在家系子代间差异均极显著,家系遗传力大于单株遗传力,生长性状间表型、遗传和环境相关紧密,分枝与各生长性状呈紧密的正相关.4.5年生时生长最好的No.33号家系子代的单株材积达0.04817m3,是最差子代No.36号的179.53%,是群体均值的127.40%.共有31个家系子代生长表现优于两个对照.运用指数选择法对家系进行多性状综合选择,选出4个优良家系和6个生长慢、形质差的家系.

A variance and genetic analysis was conducted of 39 Eucalyptus urophylla family progenies. The results show that there are significant differences in growth and other characteristics among the family progenies at different ages; that family heritability ranging 33.25%～80.14% is higher than individual heritability; and that growth characteristics are closely correlated with branch size (B_R). The results also indicate that at the age of 4.5, the mean value of individual volume (S_V) of the fastest family progeny (No.33) ((0.048 17 m^3)) is respectively 1.858 7 times that of the worst progeny and 1.274 0 times that of the whole population (all family progenies); that altogether there are 31 family progenies growing faster than CK; and that by using multi-trait index as the criteria, 4 superior family progenies are selected and the estimated gains are respectively 3.12%, 2.44%, 0.20%, 6.88%, 3.72% and (7.69%) for H, D_(BH), H/D_(BH), S_V, S_F and B_R.