ABSTRACT

Genetic parameters are reported for coastal Douglas-fir, from measurements on 24,000 first-generation open-pollinated families (786 test sites) and 2,400 second-cycle crosses (120 test sites) over a period of 45 years. The following were estimated: across-site narrow-sense individual heritability (h²_A), narrow-sense family mean heritability (h²_F), and type B genetic correlation (r_B), and_. narrow-sense single-site heritability (h²_w). The main traits were height, diameter at breast height (dbh), volume index (both cycles), and incidence of stem forking and ramicorn branching, upper stem sinuosity, and second flushing in the leader (second cycle). Smaller datasets were available for progression of budburst, straightness, needle retention, wood specific gravity and acoustic velocity. Measurements were between three and 30 years from planting. The dataset contained at least one trait measured for 2.602 million trees . Heritability (h²_A) estimates for height, dbh, volume and sinuosity ranged from 0.15 to 0.30, with a wider range for h²_w estimates. Heritabilities were higher in the second cycle. Forking and ramicorn branching had good h²_F heritabilities. Second flushing had high h²_A and r_B values; the same is often true for AV. Budburst was the most strongly inherited trait. h²_w for height, dbh, volume, forking and ramicorns was correlated with means for those traits.

摘要

据报道，在45年的时间里，通过对24,000个第一代开放传粉科（786个测试点）和2,400个第二轮杂交（120个测试点）进行测量，得出了道格拉斯冷杉沿海地区的遗传参数。估计以下各项：跨站点的狭义个体遗传力（h ² _A），狭义家庭平均遗传力（h ² _F）和B型遗传相关性（r _B），以及_。狭义单点遗传力（h ² _w）。主要特征是身高，胸径（dbh）直径，体积指数（两个周期）以及茎叉和ramicorn分支的发生率，上茎的弯曲度以及前导肌的第二次潮红（第二周期）。较小的数据集可用于发芽，笔直度，持针率，木材比重和声速的进程。测量是在播种后的3到30年之间。该数据集包含至少一项为260.2万棵树木测得的性状。高度，dbh，体积和弯曲度的遗传力（h ² _A）估计值介于0.15到0.30之间，h ² _w估计值的范围更广。在第二个周期中遗传力较高。分叉和ramicorn分支具有良好的h ² _F遗传力。第二次冲洗的h ² _A和r _B值较高；AV通常也是如此。布德伯斯特（Budburst）是最强烈的遗传特征。h ² _w的身高，dbh，体积，分叉和裸果与这些性状的均值相关。