四川杉木2代种子园半同胞子代测定林生长性状的遗传变异分析

Genetic variation analysis of growth characteristics in half-sib progeny of the second generation seed orchard of Chinese fir in Sichuan Province

种子园子代测定林是开展推进种子园向升级换代的必要途径,对杉木第2代无性系种子园半同胞子代测定林13年生生长性状进行了遗传变异分析,以为杉木3代种子园的建设提供基础数据,结果表明:子代测定林的胸径、树高和材积在家系间、区组间以及二者的交互效应均存在显著差异,胸径和材积的家系遗传力为0.279和0.250,具有开展选优的价值和潜力;且胸径变异系数显示无论是在个体间还是在家系间生长都还在持续分化的过程中。51个家系胸径、树高和材积总的平均值分别为17.18 cm、12.61 m和0.1592 m3,相比对照均值现实增益分别为3.56%、2.66%和8.00%,材积现实增益超过10%的家系数量达21个,其中材积最大的家系现实增益达到了31.43%,现实增益明显。依据材积和胸径变异系数进行的综合优良度分析显示,T71,T78,T122,T152,T106,T114和T88等24个家系综合表现优异,可作为第3代无性系种子园建园材料的主要候选。

The progeny testing in seed orchards is a necessary way to promote the upgrading of seed orchards.The genetic variation of the 13-year-old growth characteristics of the half-sib progeny of the second generation clonal seed orchard of Chinese fir was analyzed,which provided basic data for the construction of the third generation seed orchard of Chinese fir.The results showed that there were significant differences in the diameter at breast height(DBH),tree height(H),and volume(V)among families,blocks,and their interaction effects.The family heritabilitis of DBH and V were 0.279 and 0.250,which had the value and potential for conducting selection.The coefficient of variation(CV)of DBH showed that growth was still in the process of continuous differentiation,whether between individuals or families.The average values of DBH,height and volume of 51 families were 17.18cm,12.61m and 0.1592m3,respectively.Comparied with the control,the real gains were 3.56%,2.66%,and 8.00%,respectively.There were 21 families with a real gain exceeding 10%in volume,among which the family with the largest volume achieved a real gain of 31.43%,which was obvious.According to the coefficient of variation of volume and DBH,the comprehensive goodness analysis showed that 24 families,including T71,T78,T122,T152,T106,T114,and T88,had excellent comprehensive performance and could be used as the main candidates for the construction of third-generation clonal seed orchard.