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作 者 ：李春明1,2；严冬1；夏辉1；梁德洋1；司冬晶1；尹绍鹏1；刘殿昆1；赵国辉3；赵曦阳1,3*

期 刊 ：植物研究 2016年 36卷 1期 页码：62-67

关键词：毛白杨；生长量；叶片性状；变异系数；重复力；

Keywords:Populus tomentosa, growth, leaf traits, coefficients of variation, repeatability,

摘 要 ：以1年生50个毛白杨种内杂交无性系（49个全同胞子代无性系和1个亲本）为材料，对其苗高、地径和10个叶片性状（叶片长度、叶片宽度、叶柄长度等）进行调查分析，结果表明：无性系间所有性状均存在极显著差异（P<0.01），50个无性系苗高平均值为64.47 cm，地径平均值为7.53 mm，叶片长度、叶片宽度和单叶面积平均值分别为9.43 cm、8.78 cm和60.05 cm²；各性状表型变异系数变化范围为2.88%（叶基角）-100.36%（单叶面积），遗传变异系数与表型变异系数接近，重复力变化范围为0.851（地径）-0.973（叶尖角），高变异、高重复力有利于优良无性系的选择；相关分析结果表明叶片长度、叶片宽度、单叶面积与苗高和地径间均达极显著正相关水平（P<0.01）；从回归分析来看，叶片宽度、叶片长度和叶片锯齿数量是影响苗高、地径的重要因子；利用综合评价法，以10%入选率对无性系进行选择，无性系Ph111、Ph153、Ph90、Ph14和Ph12入选，入选无性系苗高和地径遗传增益分别为32.20%和13.01%。

Abstract:50 intraspecific hybridization Populus tomentosa clones including 49 offspring clones and one male parent clone in one year-old as materials, tree height(H), basal diameter(BD) and 10 leaf traits(leaf length(LL), leaf width(LW), leaf petiole(LP) et al.) were investigated. There were exist highly significant difference(P<0.01) for all the traits among different clone. The average of H, BD, LL, LF and leaf area(LA) were 64.47 cm, 7.53 mm, 9.43 cm, 8.78 cm and 60.05 cm², respectively. Coefficients of phenotypic variation(PCV) of all the traits ranged from 2.88%(leaf basal angle, LBA) to 100.36%(leaf sharp angle, LSA), coefficients of genetic variation(GCV) were close to PCV and repeatabilities(R) ranged from 0. 851 to 0. 973. High PCV and R were beneficial for excellent clone selected. There was significant positive correlation among LL, LW, LA, H and BD(P<0.01). Regression analysis results showed that LW, LL and leaf sawtooth number(LSN) were the most important factors for influencing H and BD growth. By the comprehensive evaluation, with a selection rate of 10%, Ph 111, Ph 153, Ph 90, Ph14 and Ph 12 were selected as the excellent clones．Genetic gains from these five clones were 32.20% for tree height and 13.01% for basal diameter, respectively.

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