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林业科学 ›› 2003, Vol. 39 ›› Issue (2): 52-57.doi: 10.11707/j.1001-7488.20030209

• 论文及研究报告 • 上一篇    下一篇

直干桉生长性状的遗传效应分析

李淡清 刘永平 郑行生 朱仁刚 黄永祥   

  1. 云南省林业科学院,昆明650204;云南省林木种苗站,昆明650215;云南省禄丰县一平浪林场,禄丰651214
  • 收稿日期:2002-02-28 修回日期:1900-01-01 出版日期:2003-03-25 发布日期:2003-03-25

ANALYSIS OF GENETIC EFFECTS ON GROWTH TRAITS IN EUCALYPTUS MAIDENII

Li Danqing,Liu Yongping,Zheng Hangsheng,Zhu Rengang,Huang Yongxiang   

  1. Yunnan Academy of Forestry Kunming 650204;Tree Seed and Seedling Station of Yunnan Province Kunming650215;Yipinglang Forest Farm, Lufeng County, Yunnan Province Lufeng651214
  • Received:2002-02-28 Revised:1900-01-01 Online:2003-03-25 Published:2003-03-25

摘要:

对直干桉的树高、胸径、材积、冠幅、枝下高、弯曲度和枝径比等7个性状的一般配合力(GCA)、特殊配合力(SCA)、母本效应(FEM)、父本效应(MAL)和特殊正反交效应(SRE)进行了分析,重点讨论了树高、胸径和材积3个性状的遗传效应。这些性状主要受SRE和MAL的控制,GCA仅对树高和枝下高有较小的影响。有两个亲本数量性状的GCA值高,可用于建立种子园。直干桉自交衰退非常严重,有8个组合的数量性状显著高于平均值。对直干桉进行遗传改良的最好途径是:通过杂交育种,从中再选出优异个体进行无性繁殖,培育出优良无性系后应用于生产。若要以建立种子园来改良直干桉,必须引进或引变新的育种材料才有效果。

关键词: 直干桉, 双列交配, 遗传效应, 配合力, 生长性状

Abstract:

The genetic effects of general and specific combining ability, male, female, and specific reciprocal cross were analyzed for height, DBH, volume, crown-width, under branch height, crook degree and ratio of branch to shoot in Eucalyptus maidenii. Three quantitative characters, i.e. height, DBH, volume were focus, and their genetic effects were discussed in detail. It was found that the specific reciprocal cross(SRE) was the most important for quantitative characters, then, the male effect(MAL). The general combining ability(GCA) had just less affect height and under branch height, almost zero for the other traits. Specific combining ability(SCA) just affect crook degree and under branch height, but the female effect(FEM) was more important on crown-width, under branch height and ratio of branch to shoot. Two parents were good materials with high value of GCA to the used for establishing next generation seed orchard. Eight combinations were dominant on quantitative characters. It was the best breeding strategy that cross breeding, then superior trees selected from combinations for vegetative propagation, but selection breeding, i.e. establishing seed orchard can not be significantly improved base on the sampling population. Inbreeding depression was very serious in this species.

Key words: Eucalyptus maidenii, Diallel mating, Genetic effects, Combining ability, Growth traits