马尾松无性系苗期生长性状遗传多样性分析

选用桐棉种源马尾松优良单株10株为组培材料进行无性系繁育，以其0.5年生苗木为研究对象，对无性系的苗高、地径生长进行测定和差异显著性分析，利用加权系数法构建选择指数，对各无性系进行综合评价和初步选择。结果表明：无性系苗高生长介于15.9~24.2 cm之间，地径生长介于2.9~3.8 mm之间，无性系间表型性状变异十分丰富。无性系间苗高和地径生长差异均达到极显著水平(P < 0.01)；无性系苗高、地径的重复力分别为0.96、0.91，说明生长性状主要受遗传控制；根据综合评价分析选出PC2和PC7两个无性系，其苗高和地径遗传增益分别为15.16%与13.33%和10.35%与5.04%，现实增益分别为15.79%与13.88%和11.44%与5.57%。

Analysis on Genetic Diversity of Growth Characters in Seedling Stage of Pinus massoniana Clones

Ten clones of Pinus massoniana were established by the fine single plant from Tongmian provenance for tissue culture. The height and ground diameter growth of clones were measured and significant differences were analyzed with half a year P.massoniana seedling. The selection index was constructed by weighting coefficient method, and all clones were comprehensively evaluated and selected preliminarily. The results showed that the height growth of clone seedlings was between 15.9-24.2 cm, the growth of the ground diameter was between 2.9-3.8 mm, the variation of phenotypic traits among clones was very rich. The difference of the height and ground diameter of the clones were very significant (P < 0.01), the repeatability of height and ground diameter of clone seedlings were 0.96 and 0.91 respectively, and the growth traits were mainly controlled by heredity. According to the comprehensive evaluation analysis, PC2 and PC7 were selected, and the genetic gain of seedling height and ground diameter of selected clones were 15.16% and 13.33%, 10.35% and 5.04%, while the real gain were 15.79% and 13.88%, 11.44% and 5.57% respectively.