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近些年来,关于丧失遗传多样性的问题,曾进行过深入的讨论。本文提出的一些事实不仅与制定育种方案有关,而且影响到林木品种和基因资源的保存,应该引起人们的注意。在农业生产中,由于过分的限制遗传基础,已造成过损失、甚至灾难。如在爱尔兰,马铃薯是当地居民的基本食物,栽种了大量的单无性系马铃薯,后因感染了晚疫病,致使大面积失收,从1841年至
In recent years, there has been intensive discussion on the issue of loss of genetic diversity. Some of the facts raised in this paper should not only be concerned with the development of breeding programs, but also affect the conservation of forest species and genetic resources, which should be paid attention to. In agricultural production, losses and even catastrophes have been caused by undue restrictions on the genetic basis. In Ireland, for example, potatoes are the staple food for local residents and planted a large number of monocotyledonous potatoes. After being infected with the late blight, large areas of potatoes were lost. From 1841 to