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ARS Home » Midwest Area » Urbana, Illinois » Soybean/maize Germplasm, Pathology, and Genetics Research » Research » Publications at this Location » Publication #327574
Title: Resistance of soybean genotypes to Sclerotinia sclerotiorum isolates in different incubation environments

Author
item CASTRO, LEONARDO - Universidade Federal De Uberlândia
item FIGUEIRO, ADRIANA - Universidade Federal De Uberlândia
item NOGUEIRA, ANA PAULA - Universidade Federal De Uberlândia
item Clough, Steven
item JULIATTI, FERNANDO - Universidade Federal De Uberlândia

Submitted to: Genetics and Molecular Research
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 9/19/2016
Publication Date: 11/21/2016
Citation: Castro, L., Figueiro, A., Nogueira, A., Clough, S.J., Juliatti, F. 2016. Resistance of soybean genotypes to Sclerotinia sclerotiorum isolates in different incubation environments. Genetics and Molecular Research. 15(4):gmr15049061. doi: http://dx.doi.org/10.4238/gmr15049061.

Interpretive Summary: White mold is a serious disease that limits the maximal potential of soybean yields. Some soybean genotypes have marginally enhanced resistance to the white mold fungus, Sclerotinia sclerotiorum. Identifying these soybean genotypes with enhanced levels of resistance, and breeding them into modern soybean varieties, can help reduce losses caused by this disease. We screened 103 genotypes from the soybean collection at the Federal University of Uberlandia, Brazil, to identify genotypes with enhanced resistance. We found one, EMGOPA-316, to be significantly more resistant than the others, and propose the use of this genotype in soybean breeding programs.

Technical Abstract: Sclerotinia sclerotiorum is an important soybean pathogen. The objectives of this study were to evaluate levels of resistance of soybean genotypes to the fungus, and to determine the effects of different incubation environments on host resistance and pathogen aggression. Two experiments were conducted using 103 genotypes from the seed collection of the Laboratório de Desenvolvimento de Germoplasma, Universidade Federal de Uberlândia (LAGER-UFU). The first experiment was conducted in a greenhouse, and the second in a growth room. Inoculations were performed by the straw test method with two Brazilian isolates of the fungus, one from Uberaba, Minas Gerais, and the other from Jataí, Goiás. The average stem lesion length in centimeters at five days post inoculation was used to determine levels of resistance. The overall most resistant genotype across the studies was EMGOPA-316, and the most susceptible was LAGER-29. Incubation in the growth room and use of the Jataí isolate gave the most reliable data, and the multivariate analysis indicated that the genotypes were divergent under the growth room conditions.