论文部分内容阅读
由于高等植物的大部分数量性状是受某些主效基因组或众多的微效基因控制,因此应用人工诱变方法使这些微效基因发生突变和累加,有时可能比诱导主基因突变在诱变育种上更具有重要意义。为此人们经常采用较高剂量处理。然而,剂量提高往往会导致染色体畸变增加,因此也减少了得到微效基因突变的机会。连续几代的轮回诱变处理可能是解决这一问题的有效方法。目前正在对这种方法进行广泛的研究。有结果指出,轮回处理比一次处理得到突变频率高。但由于这些研究并未涉及数量性状,特别是那些微效基因突变性状的遗传变异,因此,对轮回处理是否能够同样有效地积累微效基因变异的问题还不清楚。
Because most of the quantitative traits in higher plants are controlled by some major genomics or many minor genes, the use of artificial mutagenesis to mutate and accumulate these minor genes may sometimes be more effective than induction of major gene mutations in mutagenic breeding On the more important. To this end, people often use higher doses. However, dose escalation often leads to an increase in chromosomal aberrations, thus reducing the chances of obtaining a mimetic gene mutation. Continuous generations of recursive mutagenesis may be an effective way to solve this problem. This method is currently under extensive research. It has been shown that the frequency of mutation is higher than that of one treatment. However, since these studies do not deal with quantitative traits, especially those genetic variations in the trait of the minor gene, it remains unclear whether round robin processing can accumulate the minor gene variations equally well.