Linkage Relation between the Genes for the Form of Leaves and the Number of Seeds per Pod of Soybeans

Abstract

The object of this paper is to present new evidences of the linkage relation between the genes for the form of leaves and the number of seeds per pod of soybeans. The varieties used are“Wearucong”and “Yanta”, the former having broad leaves and two-seeded pods and the latter narrow leaves and three-seeded pods. The results obtained in crossing experiments on the characteristics concerned are summarized as follows:
1. The narrow leaf (r) is a simple recessive to the broad leaf (R) and in F₂ the ratio of the latter to the former is about 3:1. This relation holds true for the two characteristics with regard to the number of seeds per pod, i. e., the two-seeded (F) is dominant over the three-seeded (f), segregating in F₂ in an average ratio 3:1.
2. There is a linkage relation between R and F, the crossing over value being about 10 per cent.
3. The action of the gene for leaf form interferes to some extent with the action of the gene for seed number per pod, and a number of genes other than the leaf form gene seem also to interfere with the action of the gene for seed number per pod.