杂种落叶松F2代自由授粉家系纸浆材遗传变异及多性状联合选择

对17年生7个杂种落叶松自由授粉家系和3个对照子代测定林(共10个处理)的生长和材性性状进行遗传变异分析、相关分析、综合指数评价与选择.结果表明:生长与材性性状家系间、家系内均存在较大的变异,除单位面积管胞数量外,其他性状晚材的变异系数均大于早材;材积、管胞长宽比和树脂道比量变异系数较大(26.2%～85.3%).基本密度、早材微纤丝角、管胞比量变异系数较小(1.4%～8.1%).方差分析表明:处理间综纤维素含量,早、晚材微纤丝角,管胞长宽比,晚材径向直径、胞壁率、壁腔比,管胞比量差异显著;材积、管胞长、弦向直径、早材和晚材单位面积管胞数量差异极显著,家系遗传力为59.3%～92.7%,家系水平的材性改良潜力较大.材积与综纤维素含量成极显著正相关,与早材和晚材微纤丝角、弦向直径、晚材壁腔比和管胞比量成正相关,与管胞长宽比和晚材单位面积管胞数量成负相关;基本密度与材积成微弱的负相关,与综纤维素含量成显著的负相关,与管胞长宽比、早材微纤丝角、晚材单位面积管胞数量成正相关;综纤维素含量与管胞长宽比和晚材单位面积管胞数量成负相关;管胞长宽比与晚材壁腔比成极显著负相关;晚材微纤丝角与管胞比量成显著的正相关.对生长和材性进行综合评价,选出I3,I4,I93个比较理想的多性状指数方程.适合作纸浆林培育的家系为兴7×日77-2、日5×长77-3和日3×兴9.入选率30%时,各性状家系遗传增益分别为:材积34.7%,综纤维素含量7.5%,晚材壁腔比11.0%,晚材胞壁率6.2%,管胞长宽比4.5%,晚材微纤丝角3.2%,管胞比量0.3%.

Genetic Variations in Pulpwood Qualities of F2 Generation of Open-Pollinated Larch Hybrid Families and Multi-Traits Selection

This study measured genetic variation in growth and wood traits in seven 17-year-old open-pollinated larch hybrid families and three control progeny testing forests and conducted the correlation analysis,comprehensive evaluation and selection.The results showed that there were variations within the families as well as between families.Latewood had greater coefficient of variation than earlywood.There were abundant variations in the volume,tracheid length-width ratio,resin canal proportion and the coefficien...