Project Details

Name 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   FAPESP Project
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Validity Date 01/04/2012 - 31/03/2014
Team Paulo Cezar Ceresini (UNESP Ilha Solteira); Edisson Chavarro Mesa (DR-FAPESP, UNESP Jaboticabal); Daniel Schurtz (EMBRAPA Roraima); Matheus Mereb Negrisoli (IC-CNPq, UNESP Ilha Solteira); Nadia Maria Poloni (IC, UNESP Ilha Solteira)
Participating Institutions Universidade Estadual Paulista (UNESP), Campus de Ilha Solteira, Faculdade de Engenharia; EMBRAPA Roraima
Biome Amazon
Abstract Emerging plant pathogens are pathogens that have been recently introduced, discovered or newly recognized; have newly evolved; have increased in incidence, expanded geographically or in host range; or have changed pathogenic properties. An emerging fungal pathogen has the potential to become endemic, epidemic and even pandemic in nature. Devastating new fungal diseases are constantly emerging from the ecosystem. Using evolutionary theory and phylogeographycal approaches, our goal is to provide a framework for evaluating the emergence of new pathogens considering the adaptability to environmental changes and the fit between new pathogen invaders and the new combinations of host/environment. We have chosen a system to study the emergence of a devastating fungal disease in Brazil: the originally rice-infecting pathogen Rhizoctonia solani AG-1 IA, which has a worldwide distribution and emerged as a Brachiaria- pathogen in the Brazilian and Colombian Amazon. The questions we ask in this proposal are: i. Was the emergence of this disease due to the introduction of the pathogen into new environments or have host-shifts occurred between geographically overlapping host species? ii. Was the emergence of this disease facilitated by environmental changes, such as changing habitats (eg, crop replacement, crop rotation)? iii. Considering the pathogen’s potential for host-shifts, the corresponding hosts’ susceptibility, and the fact that the pathogen has already emerged independently twice, is it possible to predict the patterns of emergence of this disease in a new agroecosystem? Our prediction is that in Sao Paulo’s Vale do Paraiba region (where Brachiaria and rice crops are geographically contiguous or overlapping) the local populations of R. solani AG-1 IA could also emerge as a Brachiaria pathogen.
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