Expression and inheritance of resistance to Fusarium solani in soybean
Stephens, Paul Alan
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https://hdl.handle.net/2142/18962
Description
Title
Expression and inheritance of resistance to Fusarium solani in soybean
Author(s)
Stephens, Paul Alan
Issue Date
1992
Doctoral Committee Chair(s)
Nickell, Cecil D.
Department of Study
Agriculture, Agronomy
Discipline
Agronomy
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Agriculture, Agronomy
Biology, Genetics
Biology, Plant Physiology
Language
eng
Abstract
Sudden death syndrome (SDS) of soybean (Glycine max (L.) Merr.) is caused by the soil borne fungus Fusarium solani (Mart.) Appel & Wollenw. emend. Snyd. & Hans. Symptoms of SDS include root rot, xylem discoloration, foliar chlorosis and interveinal necrosis. Microplot, field and greenhouse experiments were performed to study the development of SDS on soybean, develop a greenhouse inoculation method for F. solani, then study the relationship between the greenhouse and field reactions, and study the inheritance of resistance to F. solani.
When microplots were used to compare SDS development on a cultivar set, cultivar differences in reaction to F. solani were found. Disease reaction on the cultivar set indicated that variation in the F. solani population existed. The microplot study also demonstrated that cultivars artificially inoculated with F. solani developed disease symptoms similar to that of plants growing in soil naturally infested with F. solani.
A greenhouse technique was developed to inoculate soybean seedlings with F. solani. Disease scores for greenhouse inoculated seedlings were highly related to field scores. In a cross between two cultivars classified as resistant and susceptible respectively to F. solani, the greenhouse inoculation technique was used to study the inheritance of resistance to F. solani. A single dominant nuclear gene, Rfs1, was found to be responsible for resistance to F. solani in the soybean cultivar Ripley.
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