Inheritance of brown stem rot resistance in soybeans.

Reference Report for IND86007490

Title:	Inheritance of brown stem rot resistance in soybeans.
Authors:	Sebastian, S.A., Nickell, C.D.
Source:	J. Hered. 1985, 7(3):194-198
Abstract:	Brown stem rot (BSR), caused by Phialophora gregata Allington and Chamberlain (W. Gams), is a serious disease of soybean [G. max (L.) Merr.]. Although sources of BSR resistance are available, little is known about the inheritance of BSR resistance. Two crosses between susceptible and resistant soybean lines were selected for a genetic study. An attempt was made to classify F3 families from these crosses as resistant, segregating, or susceptible for a classical Mendelian analysis. Cluster analysis based on leaf-symptom mean, stem-symptom mean, and leaf-symptom variance was used as the basis for classifying F3 families. A single dominant gene for resistance accounts for segregation in one cross. Segregation in the 2nd cross appears to be controlled by this same gene plus another nonallelic gene that duplicates or modifies the effect of the 1st gene. The 1st dominant gene alone should provide an adequate level of BSR resistance for breeding purposes. Selection for this gene can be efficient if environmental variation is reduced through controlled greenhouse screening.

Funded by the USDA-ARS. Developed by the USDA-ARS SoyBase and Legume Clade Database group at the Iowa State University, Ames, IA

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