马尾松实生种子园的遗传分析和育种值预测

利用５年生１３９个马尾松天然林优树自由授粉家系的测定材料，研究生长性状和雌、雄球花量的遗传变异，估算家系和家系内个体的育种值。该子代测定林是实生种子园的一部分。研究结果高、径生长和雌、雄球花量在家系间存在着极显著的差异，多数家系的生长最都大于当地的试验对照。性状的家系遗传力较高，而单株遗传力较低、雌、雄球花量所受的遗传控制与生长性状相近，遗传相关分析表明，开花性状似独立于生长性状。利用最佳线性预测

Genetic Analysis and Breeding Value Predication of Seedling Seed Orchard of Masson Pine

The data from a masson pine progeny test with 139 open-pollinated families was used to study inheritance and variation of growth and female/male flower amount and predicate breeding value of families and individuals within families.The results show that there are significant differences in height,DBH and female/male flower amount between the families at age five.The growth of most families tested are greater than those of the two controls.Family heritabilities of the traits were found to be higher and the individual heritabilities lower.Female/male flower amount was under nearly the same genetic control as growth traits.The genetic correlation analysis indicates that flowering traits seem to be independent of growth.Using best linear predication approach,the selection index equations for parent selection and family and within family selection are established with prediction precision of 0.652 2 and 0.421 5 respectively.The selection index equations,which could be used repeatedly to predicate the breeding value of each family and each individual tree,are the scientific basis for removing the rogue in the seedling seed orchard.Finally the principle about roguing and thinning in seedling seed orchard was discussed.