论文部分内容阅读
以1978年配制的17个组合为材料研究了大豆F_1杂种表现与选择效果的关系。 F_1代绝对产量水平与后代选择效果无规律性变化。两亲生育期差异较小的高产组合,其F_1代优势不很高,绝大部份组合的产量优势都小于140％,其中多数为120％左右。两亲差异较大的优良组合,有向优势变大方向分布的趋势。F_1优势大于140％的组合基本上无优良组合,而小于100％的组合则绝大多数为劣组合。F_1营养体高优势及最低优势组合的后代绝大部份表现不良。两亲生育期差异较小的组合中,优良者一般有中等程度的营养体优势。叶面积优势变幅为115—130％,超过150％的不是好组合。时干重优势与选择效果的关系类似于叶面积。F_1叶质重优势特高或低下的组合,后代绝大多数表现不良,优良组合的叶质重优势为80—100％。籽粒产量优势与营养体优势指数之间有一个平衡关系,优势组合中两者比值为1.0,变幅为0.85—1.17,过大过小后代选择效果均不良。
Based on 17 combinations formulated in 1978, the relationship between F1 hybrid performance and selection effect was studied. There was no regular change between F_1 generation absolute yield and offspring selection effect. The high-yielding combination with small difference in growth period between two parents showed that the advantage of F_1 generation was not very high. The output advantage of most combinations was less than 140%, most of which was about 120%. The good combination of large differences between the two parents has the tendency of increasing the distribution of advantages. Combinations where the F_1 advantage is greater than 140% have essentially no good combination, while those less than 100% are mostly bad. Most of the descendants of the F_1 nutritionally high and lowest performing combination did not perform well. In the combinations with less difference in growth periods between parents, the better ones generally have the advantage of medium nutrition body. Leaf area advantage amplitude of 115-130%, more than 150% is not a good combination. When dry weight advantage and the effect of the choice of the relationship between the leaf area. The combination of F_1 leaf weight with extremely high or low dominance, most of the offspring showed poor performance, and the leaf weight weight of the excellent combination was 80-100%. There is a balance between the grain yield superiority and the vegetative dominant index, the ratio of the two is 1.0 in the dominant combination, and the amplitude is 0.85-1.17.