Gene Analysis of Resistance in Wild Soybean (Glycine soja) to Purple Seed Stain Caused by Cercospora kikuchii

Abstract

Resistance to purple seed stain in F₂ and B₁F₁ plants derived from the cross of Oshimashirome with wild soybean were investigated. Resistance in wild soybeans seems to be controlled by two dominant genes having different degree of resistance. Even the F₂ or B₁F₁ plants with only one of the two genes for resistance were more resistant than Hanayome that was one of the most resistant varieties. No or little significant correlations between resistance and some other characters such as plant height, 100-seed-weight, seed color, and hard-coatedness were detected in F₂ and B₁F₁ populations. Therefore, it was considered that a highly resistant variety could be developed from an interspecific hybridization between soybean (Glycine max) and wild soybean (G. soja).