Pathogenic variability in monoascosporic strains of Sclerotinia sclerotiorum in soybean crop

Ano: 2025 | Volume: 17 | Número: Não se aplica

Autores: Gentil Lima , J., Teodoro Bruzi, A. T. B., Aparecida de Souza , E., Teotônio Teixeira da Rocha , T., de Souza Arantes , P., & Cristina Batista , E.

Palavras-chave: Glycine max, genetic resistance, straw test, white mold.

Resumo Inglês:

This work was developed with the objective of evaluating the pathogenic variability among monoascosporic strains of the same S. sclerotiorum isolate using the straw test in soybean cultivars. A total of 20 cultivars from the Soybean Germplasm Bank of the Federal University of Lavras (UFLA) and five monoascosporic S. sclerotiorum strains were included. A greenhouse experiment was carried out to assess the variability in aggressiveness among monoascosporic strains. Plants at the R1 stage were inoculated by the straw test. The experiment was implemented in a completely randomized design with three replicates. Evaluations were made with a graduated ruler at seven, 14, and 21 days after inoculation according to the proportion of damaged area. The area under the disease progress curve (AUDPC) was estimated. Monoascosporic strains 7.3 and 7.4 were the most aggressive, and the BRSMG 790A and BRSMG 850GRR cultivars had more stable resistance to the different monoascosporic strains. There was variability between the monoascosporic strains, and strains 7.3 and 7.4 are preferred for inoculation in breeding programs aimed at obtaining soybean cultivars resistant to S. sclerotiorum.