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作物中许多具有经济价值的性状,如产量、株高、成熟期、百粒重等,均为数量性状,易受环境影响而难以了解其遗传规律。育种实践指出,某些数量性状在上下代传递之间,较为稳定,而另一些性状则变化较大。晚近数量遗传学者认为前者为纯合个体所产生,受相加性遗传因素效应的影响,而后者为杂合个体所产生受显性及上位性遗传效应的影响。金克士(Jinks 1954)用双列杂交法,仅就一个世代杂交组合的表现,估算出数量性状有关遗传因
Many of the economically valuable traits in crops, such as yield, plant height, maturity, and 100-grain weight, are quantitative traits that are easily affected by the environment and difficult to understand their genetic laws. Breeding practice points out that some quantitative traits are relatively stable between the previous generation and the next generation, while other traits vary greatly. The recent number of geneticists believe that the former is generated by homozygous individuals, which are affected by additive genetic factors that are affected by dominant and epistatic genetic effects in heterozygous individuals. Jinks (1954) used the double-line hybridization method to estimate the quantitative trait related genetics only for the performance of one-generation crosses