摘要
杉木第一代和第二代遗传改良,主要是以生长性状改良为主。利用同一良种基地上的杉木第一代种子园和第二代种子园自由授粉子代试验资料,比较了改良生长性状时对一代、二代子代试验林木材密度的影响。结果发现:(1)随着世代的推进,生长性状(材积、树高和胸径)和木材密度的遗传变异性没有明显下降;(2)随着世代的推进,木材密度与生长性状间存在负的遗传相关有升高的趋势;(3)杉木木材密度具有较高的单株遗传力,为单株选择改良材质性状提供了保障。由此建议将木材密度改良纳入多世代改良中,并针对这种负的遗传相关,通过杂交育种来产生速生优质材料,采用综合选择指数来进行优良材料的评选。
Growth traits are the main selection criteria for the first two generations of the Chinese fir breeding programs. However breeders need to be aware of possible negative influences of such selection criteria on wood density. This study examined the genetic variation and inheritance of wood density,and its relationship with growth traits by using the first generation and the second generation progeny testing plantations,and indirect influences of growth improvement on wood density was studied when growth traits were directly selected from each generation. The results were as follows as：（ 1） with the advancement of generations,amplitude of genetic variability of volume,H,DBH and wood density didn＇t shrink;（ 2） in addition,there was negative genetic relationship between wood density and growth traits,especially with the advancement of generations,this negative genetic relationship still rose;（ 3） although wood density had smaller genetic variability than growth traits,but was favorable on one hand,wood density had higher individual heritability. This means that there were considerable genetic gains by mass selection. Thus it can be seen that timber properties improvement must be incorporated in multi- generation improvement programs,and the improvement of wood properties will lay on a suitable position in advanced generations breeding of Chinese fir. In order to achieve good genetic effects,it is suggested that hybridization breeding be used for producing materials with fast growth and good wood qualities,and the integrated selection index method may be used for selection on excellent materials,breeding achievement may be used by means of asexual propagation or hybridization seed orchard.
出处
《江西农业大学学报》
CAS
CSCD
北大核心
2014年第4期790-794,共5页
Acta Agriculturae Universitatis Jiangxiensis
基金
国家"十二五"科技支撑项目(2012BAD01B0201)
浙江省"十二五"竹木育种专题(2012C12908-11)
关键词
杉木
第一代
第二代
自由授粉
子代测定
木材密度
Chinese-fir
first generation
second generation
open pollination
progeny test
wood density
