杉木主要生长、材质性状遗传分析及家系选择

对 19年生杉木 8× 8半双列杂交试验林的树高、胸径、材积和木材基本密度这 4个主要生长和材质性状进行了测定和遗传分析 ,并采用指数选择法进行全同胞家系选择。结果表明 :4个主要生长和材质性状的一般配合力方差达极显著水平 ,且一般配合力方差分量占遗传方差的 75 %以上 ,即各性状的遗传控制方式均是基因加性效应起主要作用。 4个性状的广义遗传力和狭义遗传力分别为9.97%　 4 1.4 9%和 8.4 8%　 34.2 0 %。 3个生长性状之间遗传相关均为密切正相关 ,3个生长性状与木材密度之间则均为弱度遗传负相关。亲本连 5和高 37在 3个生长性状中表现出较高的一般配合力效应值 ,龙 5和龙 1在木材密度性状上表现出较高的一般配合力效应值。采用材积和木材密度两个性状 ,根据约束指数选择出 6个全同胞优良家系 ,它们在木材密度基本保持试验群体平均水平的情况下 ,材积比试验群体平均值大 2 2 .97%。

Genetic Analysis and Family Selection for Main Traits of Growth and Wood Quality of Chinese Fir

The four main traits of growth( H,D,V) and wood density in 19 year old Chinese fir plantation on 8×8 self diallei crossing were determined and analysed and the index selection were adopted in family selection. The results showed that the four main traits were highly significant,and variances due to GCA were highly significant for all the four traits. The estimated components of GCA variance were more than 75% of all genetic variances,indicating the predominance additive gene actine for these traits. The broad heritability for four traits were 9.97% 41.49%, and for narrow heritability 8.48% 34.20%. The genetic correletion coefficient were highly among three growth traits, and the genetic correletion coefficient were negative weak among three growth traits and wood density. Parent Long 5 and Gao 37 were highly general combiners for three growth traits, and parent Long 5 and Long 1 were highly general combiners for wood density. Six good families were selected by restricted index method with two traits of V and wood density, keeping wood density of good changless to compared with experiment population, V increased 22.97% to experiment population.