甜菜良种繁育有关理论与技术分析Ⅲ良繁群体的交配系统与遗传潜力

Analysis on Some Theories and Techniques of Sugarbeet Seed Production ProgramⅢ.Mating System and Genetic Potential of Random Mating Population in Sugarbeet

本文讨论了甜菜良种繁育过程中的亲本配置、特定支配体制下的遗传组成和不同遗传组成群体所蕴含的可能意义上的增产增糖潜力。交配群体的亲本数量、配比和方式是决定品种经济性状的关键环节，支配后代的杂交成分含量和类型的多少是决定品种杂种优势程度和区域立窄的基础，本文建立的非纯系亲本和杂交后代的符号表达体系为现行甜莱育种和良繁材料的遗传与系谱分析提供一种新的方法。

This paper studied parent disposition,genetic composition under the special mating sys-tem and potential root yield and sugar content under different population of geneticcomposition during sugarbeet seed production. The parcnt nuinbers, mating ratio and matingways are key factors of determining economic traits on sugarbeet variety Hybrid componentsand types of mating decendants are the basis of determining sugarbeet heterosis degree andadaptability. This study established first expressing symbols of non-pure line included parentsand hybrid descendants and the system of symbols expression is a new tool of geneticanalysis and Dedigree analysis for modem sugarbeet breeding and seed production.