Genetic analysis of partial resistance to Rhizoctonia solani in the soybean cultivar ‘Savoy’

C. A. Bradley Department of Crop Sciences National Soybean Research Laboratory, University of Illinois, 1101 W. Peabody Drive, Urbana, IL, 61801, USA

D.S. Mueller Department of Crop Sciences National Soybean Research Laboratory, University of Illinois, 1101 W. Peabody Drive, Urbana, IL, 61801, USA

D. D. Hoffman Department of Crop Sciences National Soybean Research Laboratory, University of Illinois, 1101 W. Peabody Drive, Urbana, IL, 61801, USA

C. D. Nickell Department of Crop Sciences National Soybean Research Laboratory, University of Illinois, 1101 W. Peabody Drive, Urbana, IL, 61801, USA

W. L. Pedersen Department of Crop Sciences National Soybean Research Laboratory, University of Illinois, 1101 W. Peabody Drive, Urbana, IL, 61801, USA

G. L. Hartman USDA-ARS, National Soybean Research Laboratory, University of Illinois, 1101 W. Peabody Drive, Urbana, IL, 61801, USA

Abstract

Rhizoctonia root rot, caused by Rhizoctonia solani Kühn, is a soilborne disease that can cause yield loss in soybean (Glycine max). The soybean cultivar 'Savoy' has partial resistance to R. solani. 'Savoy' was crossed to 'Jack', a cultivar that is susceptible to R. solani. Progeny from this cross was evaluated in the greenhouse for reaction to R. solani. Reaction and segregation of the F₂ and F₃ generations to R. solani indicated that resistance behaves as a quantitative trait. Heritability estimates indicate that selection for resistance to R. solani in soybean based on F_2:3 family means would be more efficient than selecting on a single F₂ plant basis.

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Genetic analysis of partial resistance to Rhizoctonia solani in the soybean cultivar ‘Savoy’

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Genetic analysis of partial resistance to Rhizoctonia solani in the soybean cultivar ‘Savoy’

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