扩展三向测交设计及其分析方法

• 作 者: 刘定富
• 机 构: 华中农业大学作物遗传育种研究所 湖北农学院
• 出 处: 华中农业大学学报
• 发表日期: 1988年04期
• 关键词: 测交 三向测交 扩展三向测交 遗传设计 上位性效应 加性显性模型 试验规模 估值 检验模型 均值

本文对Kearsey和Jinks(1968)提出的完全三向测交(fTTC)设计作了推广,提出了“扩展三向测交”(aTTC)设计。该设计只在原设计的基础上增加被测个体的自交后代,或者另加两个或三个测验系,使试验规模扩大1/4～1/3,并不增加杂交工作量。这一设计可提供若干种检验上位性的方法。当试验包括测验系时,还能估计出上位性效应的大小,并检验模型的适合性。在不存在上位性时,本设计还能提供另外两种独立估计显性变异分量H的方法,并可以从多个方面获得加性显性模型下各种均值分量的估值。这大大地丰富了三向测交分析的内容。

In this paper, we extend the design of full three-way survey (fTTC) proposed by Kearsey and Jinks (1968) and propose the design of “extended three-way survey” (aTTC). The design only increases the self-descendants of the tested individuals on the basis of the original design or adds two or three test lines to expand the test scale by 1/4 to 1/3 without increasing the workload of hybridization. This design provides several ways of testing epistasis. When the test includes a test line, it is also possible to estimate the magnitude of the epistatic effect and test the suitability of the model. In the absence of epistasis, the design can provide two other independent estimates of the dominant component of variance H, and can be obtained from a variety of aspects of the additive dominant model of the mean components of the valuation. This greatly enriched the content of the three-way dating analysis.