Data from: High genetic variation and moderate to high values for genetic parameters of Picea abies resistance to Pissodes strobi

Genetic parameters of Picea abies resistance to the white pine weevil (Pissodes strobi Peck) were estimated from 193 full-sib and 166 half-sib families in six 10-year-old progeny trials. The estimated family and individual heritability values for the cumulative weevil attack rate between ages 6 and 10 (CWA6–10) were high and moderate for both full-sib families (0.61 and 0.28, respectively) and half-sib families (0.85 and 0.40, respectively), indicating strong genetic control for this trait in Norway spruce. The fact that specific combining ability (SCA) variance represents 35 % of the general combining ability (GCA) variance suggests that non-additive (dominant) effects are weak. The strong type B correlations found for CWA6–10 (rˆB=0.96 for full-sib families and rˆB=0.81 for half-sib families) indicate that family ranks were stable across sites. For three of the five sites with high attack levels, genetic correlations were not significant between CWA6–10 and tree height at age 5. Moderate positive genetic correlations were detected between CWA6–10 and tree diameter at age 10 (rˆA from 0.29 to 0.60), but specific families showing both high resistance and good diameter growth can be found. These results suggest that the genetic improvement of Norway spruce for resistance to white pine weevil can be achieved successfully without adversely affecting growth.

本研究基于6个10年生的子代测定试验（progeny trials），利用其中的193个全同胞家系（full-sib families）与166个半同胞家系（half-sib families），估算了挪威云杉（Picea abies）对白松象鼻虫（Pissodes strobi Peck）的抗性遗传参数。针对6至10龄阶段的累计象鼻虫侵害率（CWA6–10），全同胞家系的家系遗传力（family heritability）与单株遗传力（individual heritability）分别为0.61和0.28，半同胞家系的对应值则为0.85和0.40；两类家系的遗传力均处于较高与中等水平，表明该性状在挪威云杉中受到较强的遗传调控。特殊配合力（SCA, specific combining ability）方差仅占一般配合力（GCA, general combining ability）方差的35%，提示非加性（显性）效应（non-additive (dominant) effects）相对较弱。针对CWA6–10检测到的强B型相关（type B correlations）：全同胞家系的rˆB=0.96，半同胞家系的rˆB=0.81，表明家系排名在各试验地点间保持稳定。在5个高侵害率试验地点中的3个，CWA6–10与5龄树高之间的遗传相关未达到显著水平。CWA6–10与10龄树径之间检测到中等程度的正向遗传相关（genetic correlations），其遗传相关系数rˆA的取值范围为0.29至0.60，但仍可筛选出兼具高抗性与优良径生长的家系。上述结果表明，针对白松象鼻虫抗性开展挪威云杉遗传改良，可在不对林木生长产生不利影响的前提下顺利实现。