论文部分内容阅读
水稻杂交育种的效果取决于经济性状改善的程度和速度。而经济性状大多属数量性状,在杂种分离中呈连续性的分布,没有明显的界限,易受到环境因素的影响,以致影响到选择效果。据研究这些经济性状的表现型变异主要包括基因的累加作用,基因的显性作用和环境影响三个部分。从育种角度来说,首先要掌握的是基因的累加作用,即基因加性方差。前人研究已多次报导过经济性
The effectiveness of hybrid rice breeding depends on the extent and speed of economic traits. Most of the economic traits are quantitative traits, showing a continuous distribution in hybrid segregation. There are no obvious boundaries and are easily affected by environmental factors, so as to affect the selection effect. According to the study of these economic traits of phenotypic variation include gene accumulation, gene dominance and environmental impact of three parts. From the breeding point of view, the first thing to master is the cumulative effect of genes, namely, gene additive variance. Previous studies have reported on economics many times