不同地点51个长白落叶松无性系苗期生长变异和遗传稳定性分析

长白落叶松是我国东北林区非常重要的速生用材树种之一。以不同地点51个长白落叶松无性系为材料,对其2年生苗高和地径进行调查分析,探讨其苗期生长变异和遗传稳定性。结果表明:长白落叶松无性系苗高和地径在地点间、无性系间、地点×无性系间差异均达到极显著水平(P<0.01);不同地点苗高和地径的表型变异系数处于23.89%~36.82%,除四平试验点的地径重复力为0.172外,不同地点苗高和地径的重复力均处于0.573~0.891;遗传稳定性分析结果表明,无性系LO 13等28个无性系的遗传稳定性较高;相关分析结果表明苗高与地径呈极显著正相关关系;利用多性状综合评价法,以20%的入选率对无性系进行选择,不同地点均选出10个综合表现较好的无性系,其中无性系LO 10和LO 26在不同地点均被入选优良无性系,且其遗传稳定性较强,可将其初选为优良无性系。

Stability Analysis and Genetic Variation in Seedling Growth of 51 Larix olgensis Clones from Different Sites

Larix olgensisis one of the most important fast-growing timber species in northeast China.In this study,51 L.olgensis clones from different stites were used as materials,the height and ground diameter of the 2-year-old seedlings were investigated and analyzed on the genetic stability and variation respectively.The results showed that the differences of seedling height and ground diameter for L.olgensis were extremely significant(P<0.01)within sites,clones or sites×clones respectively.The phenotypic variation coefficient of seedling height and ground diameter at different sites were from 23.89%-36.82%;and the repeatability of the ground diameter was 0.172 at Siping,but the repeatability of the rest sites were from 0.573-0.891 respectively.Genetic stability analysis results showed that 28 clones including LO 13 had the higher genetic stability respectively.The results of correlation analysis showed that there was an extremely significant positive correlation between seedling height and ground diameter.10 clones with good comprehensive performance were selected from different site using the method of comprehensive evaluation of multiple traits with a selection rate of 20%;Both clones LO 10 and LO 26 were selected as elite clones showing the excellent performance and the stronger genetic stability in the different cite respectively.