摘要
本文通过对不协调性模型的讨论和对杂交障碍的分析,建议以不协调性模型解释杂交障碍的机制。同时本文扩大了原不协调性模型中匹配基因系统的外延;并引入随机过程、障碍基因量和障碍基因顺序的概念,对原不协调性理论作了必要的修改和扩展。
The model of incongruity established by Hogenboom is discussed. It is concluded that the incongruity hypothesis is fit for the explanation of the Cross barrier mechanism.
To improve the model, the extent of matching genie systems has been expanded and some concepts are introduced into it. They are as follows.
( 1 ) Polyplacity。 There may be more than one barriers in agiven Cross and a barrier may appear in any developing stage. That is sugges-ted to be described as polyplacity.
( 2 ) Random process. When a barrier takes place, the plant May take one or more phenomena corresponding to various physiologic processes which take place at random without being controled by constant genes.While some of the random processes may be of benefit to the hybrid to overcome or simply pass the barrier.
(3)Namber of barrier genes and the order of barrier genes.Whether the hybrid can pass a barrier is determined by the two independent variables. The more the namber of barrier genes(including lack of genes) is , the more barriers will take place, while the more continuous the barriers appear, the more difficult to the hybrid to pass the barrier stage by means of random processes.
出处
《山东林业科技》
北大核心
1989年第4期1-6,共6页
Journal of Shandong Forestry Science and Technology
关键词
植物
杂交
不协调性
模型
胚胎学
embryology
cross
incongruity
incompatibility
