黄连木优树种实性状指标通径及遗传参数分析

Analysis on Path and Genetic Parameters in Elite Seeds and Fruits Character Indexes of Pistacia chinensis Burne

黄连木是重要的能源树种之一,优树种实性状指标通径及遗传参数分析对良种选育有重要意义。果宽、果厚与单果重的遗传相关系数分别为0.8296和0.7999;种长、种宽和果宽的遗传力方差分别为0.0036、0.0031和0.0029。宽大的果和种对单果重贡献较大。果宽和种长的直接遗传通径系数为正向效应,果长、果厚和种宽主要通过果宽和种长对单果重产生正向遗传效应。绿粒率、单果重和单种重的遗传力分别为0.963、0.989和0.995。果重/穗、出仁率及单仁重的相对遗传增益分别为105.55%、53.59%和56.82%。通过指标比较得出对种子、果实性状直接选择比果重/穗更好。

Pistacia chinensis Bume is one of the important energy-oriented species, the analysis on path and genetic parameters in elite seeds and fruits character indexes had important significance to improve and select varieties. The genetic correlation coefficient of fruit width, fruit thickness with single fruit weight was 0.829 6 and 0.799 9 respectively; heritability variance of seeds length, seeds width and fruits width was 0.003 6, 0.003 1 and 0.002 9 respectively. The width of fruits and seeds had great contribution to single fruit weight. The direct genetic path coefficient of seeds width and seeds length was positive effects, fruit length, fruit thickness and seeds width had positive genetic effect to single fruit weight through fruit width and seed length. The heritability of green grain rate, single fruit weight and single seed weight was 0.963, 0.989 and 0.995 respectively. The relative genetic gain of fruit weight/ear, the kernel rate and single kernel weight was 105.55% ,53.59% and 56.82% respectively. The direct selection for seed and fruit characters was better than fruit weight/ear through the comparison of those indexes.