论文部分内容阅读
一、对林木无性系繁殖的认识林木有两个特点,生命周期长、生长速度及树形随着年龄的增加而变化。这两个特点限制着林木育种技术的发展,在生产上应用控制授粉技术和人工诱导突变等育种手段比较困难,而这些技术在1年生作物的育种上已取得很大进展。在试验性的范围内,澳大利亚已用控制授粉技术克服桉树的自交问题,并得到两个良种按树的种间杂交后代,
First, the understanding of forest clonal reproduction Forest has two characteristics, long life cycle, growth rate and tree shape changes with age. These two characteristics have limited the development of tree breeding techniques. It is difficult to apply breeding methods such as controlling pollination and artificial induced mutation in production, and these techniques have made great progress in the breeding of 1-year-old crops. In the experimental context, Australia has used the control of pollination techniques to overcome the self-fertility of eucalyptus and obtain interspecific cross between offspring of two elite species,