The Journal of Heredity 1985:76(3):194-198
© 1985 The American Genetic Association 76:194-198
research-article |
Inheritance of brown stem rot resistance in soybeans
The authors are, respectively, former graduate research assistant, and professor of plant genetics, Department of Agronomy, University of Illinois at Urbana-Champaign, IL 61801. This research was supported by the Illinois Soybean Program Operating Board. The authors wish to thank Charles Smyth, Statistician in the Department of Agronomy at the University of Illinois, for sharing his knowledge of the cluster analysis procedure.
Abstract
Brown stem rot (BSR), caused by Phialophora gregata Allington and Chamberlain (W. Gams), is a serious disease of soybean [Glycine 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 second cross appears to be controlled by this same gene plus another nonallelic gene that duplicates or modifies the effect of the first gene. The first 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.
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M.S. Bachman, J.P. Tamulonis, C.D. Nickell, and A.F. Bent Molecular Markers Linked to Brown Stem Rot Resistance Genes, Rbs1 and Rbs2, in Soybean Crop Sci., March 1, 2001; 41(2): 527 - 535. [Abstract] [Full Text] [PDF] |
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