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尾叶桉×细叶桉杂种无性系扦插生根和生长性状的研究

, PP. 135-140

Keywords: 桉树,杂种,无性系,扦插,生长,广义遗传力

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Abstract:

对尾叶桉×细叶桉5个杂种组合的181个无性系扦插生根和生长性状的研究表明:每穗根数、每穗最长根长和生根率3个扦插生根性状,杂种组合间和杂种组合内无性系间的差异均达0. 01显著水平; 46个月生树高、胸径和单株材积3个生长性状,杂种组合间差异不显著,杂种组合内无性系间的差异达0. 01显著水平。无性系扦插生根性状和生长性状的广义遗传力介于0. 32 (每穗最长根长) ~ 0. 94 (生根率)之间,表明各性状受中等到高等程度的遗传控制。无性系扦插生根性状平均值与生长性状平均值的表型相关均不显著。无性系各生长性状在13、18、46个月生之间的年年相关均达到0. 01显著水平,表明在较早生长期进行无性系选择具有一定的可行性。本研究初选出易扦插、速生的尾细桉杂种无性系24个,无性系间单株材积株间变异系数为13. 87% ~68. 55% ,无性系内变异可能与母株年龄效应、位置效应和立地环境条件等C2效应因子有关。对桉树杂交育种而言,杂交制种后直接进行育苗、扦插和无性系试验是一条快捷有效的无性系培育途径。

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