Growth Variation and Selection to the Progeny of Nucleus Breeding Population of Pinus taeda | 火炬松核心育种群体子代生长变异与选择

chinois. 广东省火炬松第1代核心育种群体68个全同胞组合的子代,组成了第2代核心群体的基本群体,在8,10,15年时分别对其树高、胸径和材积生长性状进行研究。结果表明：8,10,15年时,各生长性状在组合间都存在极显著差异。根据15年时各亲本子代的生长表现,选择8个优良母本和4个优良父本,可用于营建精选种子园或控制授粉种子园,生产遗传改良度高的种子。以15年全同胞家系平均材积作为选择指标,共选出10个组合,材积平均增益为18.94%,通过重复制种获得的种子可以用于营建插穗圃,通过扦插繁殖生产优良的全同胞家系苗木;采用配合选择共选出55个优良个体参与构建第2代育种群体,其中30个进入第2代核心群体,其余25个进入第2代主群体。

anglais. Progeny of 68 full-sib combinations from the first generation nucleus breeding population of loblolly pine （Pinus taeda） in Guangdong Province composed the base population of the second generation nucleus population. The height, diameter at breast height （DBH） and single-tree volume of the second generation nucleus population were measured in 8, 10 and 15 years. The result showed that there were extremely significant differences in height, diameter at breast height （DBH） and single-tree volume among the combinations. According to the growth performance of 15-year-old progeny, eight superior female parents and four male parents were selected. They could be used for establishing a elite seed orchard or a controlled pollination seed orchard to produce genetically-improved seed. The family-mean volume at the age of 15 year was used for the combination selection indicator and 10 combinations were selected, with the average gain of 18.94%. Seeds from re-pollination of these 10 combinations could be used to construct cutting nursery, and then cuttings from these superior full-sib families could be used for afforestation. By using combined selection, 55 individuals were selected to construct the second generation breeding population. Thirty individuals among them were selected into the second generation nucleus breeding population, remaining 25 into the second generation main breeding population.