Population Genetic Structure of Rhizoctonia oryzae-sativae from Rice in Latin America and Its Adaptive Potential to Emerge as a Pathogen on Urochloa Pastures

Autor(es)

dos Santos Pereira, Danilo A. ; Ceresini, Paulo C. ; Castroagudin, Vanina L. ; Ramos-Molina, Lina M. ; Chavarro-Mesa, Edisson ; Negrisoli, Matheus Mereb ; Campos, Samara Nunes ; Pegolo, Mauro E. S. ; Takada, Helio Minoru

• Tipo de documento: Artigo Científico
• Fonte: PHYTOPATHOLOGY; v. 107, n. 1, p. 121-131, JAN 2017.
• Citações Web of Science: 2

Resumo

The fungus Rhizoctonia oryzae-sativae is an important pathogen that causes the aggregated sheath spot disease on rice. In this study, we investigated the genetic structure of rice-adapted populations of R. oryzaesativae sampled from traditional rice-cropping areas from the Paraiba Valley, Sao Paulo, Brazil, and from Meta, in the Colombian Llanos, in South America. We used five microsatellite loci to measure population differentiation and infer the pathogen's reproductive system. Gene flow was detected among the three populations of R. oryzae-sativae from lowland rice in Brazil and Colombia. In contrast, a lack of gene flow was observed between the lowland and the upland rice populations of the pathogen. Evidence of sexual reproduction including low clonality, Hardy-Weinberg equilibrium within loci and gametic equilibrium between loci, indicated the predominance of a mixed reproductive system in all populations. In addition, we assessed the adaptive potential of the Brazilian populations of R. oryzae-sativae to emerge as a pathogen to Urochloa spp. (signalgrass) based on greenhouse aggressiveness assays. The Brazilian populations of R. oryzae-sativae were probably only incipiently adapted as a pathogen to Urochloa spp. Comparison between R-ST and Q(ST) showed the predominance of diversifying selection in the divergence between the two populations of R. oryzaesativae from Brazil. (AU)

• Processo FAPESP: 13/11944-0 - Estrutura genética de populações de Rhizoctonia oryzae-sativae do arroz no Vale do Paraíba, SP, e potencial adaptativo do patógeno à Brachiaria.
• Beneficiário: Danilo Augusto dos Santos Pereira
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 14/25904-2 - A emergência de Pyricularia tritici sp. Nov. como patógeno da brusone do trigo no Brasil: especiação simpátrica inferida por filogenia multiloci, espectro de patogenicidade e evolução de genes de virulência
• Beneficiário: Vanina Lilián Castroagudin
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 11/23050-8 - A origem de populações emergentes do patógeno da queima da folha da Brachiaria spp. (Rhizoctonia solani AG-1 IA) na Amazônia e seu potencial de adaptação a outros agroecossistemas brasileiros
• Beneficiário: Edisson Chavarro Mesa
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 11/50150-3 - A origem de populações emergentes do patógeno da queima da folha da Brachiaria spp. (Rhizoctonia solani AG-1) na Amazônia e seu potencial de adaptação a outros agroecossistemas brasileiros
• Beneficiário: Paulo Cezar Ceresini
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular