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The origin of the emerging populations of the Brachiaria collar rot pathogen (Rhizoctonia solani AG-1 IA) in the Amazon and its potential for adaptation to another Brazilian agroecosystem

Grant number: 11/23050-8
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): March 01, 2012
Effective date (End): February 28, 2015
Field of knowledge:Agronomical Sciences - Agronomy - Plant Health
Principal Investigator:Paulo Cezar Ceresini
Grantee:Edisson Chavarro Mesa
Host Institution: Faculdade de Engenharia (FEIS). Universidade Estadual Paulista (UNESP). Campus de Ilha Solteira. Ilha Solteira , SP, Brazil


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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Scientific publications (5)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
NADIA MARIA POLONI; LINA MARIA RAMOS MOLINA; EDISSON CHAVARRO MESA; IZABELA LOPES GARCIA; PAULO CEZAR CERESINI. Evidência de que o fungo Rhizoctonia solani AG-1 IA adaptado à Urochloa na Colômbia mantém ampla gama de hospedeiros incluindo o milho. Summa Phytopathologica, v. 42, n. 3, p. 228-232, . (11/50150-3, 11/23050-8)
LINA MARIA RAMOS-MOLINA; EDISSON CHAVARRO-MESA; DANILO AUGUSTO DOS SANTOS PEREIRA; MARÍA DEL ROSARIO SILVA-HERRERA; PAULO CEZAR CERESINI. Rhizoctonia solani AG-1 IA infecta arroz e braquiária nos Llanos Colombianos. Pesqui. Agropecu. Trop., v. 46, n. 1, p. 65-71, . (11/50150-3, 11/23050-8, 13/11944-0)
CHAVARRO-MESA, EDISSON; CERESINI, PAULO; PEREIRA, DANILO; VICENTINI, SAMARA; SILVA, TATIANE; RAMOS-MOLINA, LINA; NEGRISOLI, MATHEUS; SCHURT, DANIEL; VIEIRA JUNIOR, JOSE R.. A broad diversity survey of Rhizoctonia species from the Brazilian Amazon reveals the prevalence of R. solani AG-1 IA on signal grass and the new record of AG-1 IF on cowpea and soybeans. PLANT PATHOLOGY, v. 69, n. 3, . (11/50150-3, 11/23050-8, 13/11944-0, 17/03403-0)
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. Population Genetic Structure of Rhizoctonia oryzae-sativae from Rice in Latin America and Its Adaptive Potential to Emerge as a Pathogen on Urochloa Pastures. PHYTOPATHOLOGY, v. 107, n. 1, p. 121-131, . (13/11944-0, 14/25904-2, 11/23050-8, 11/50150-3)
MESA, ECLISSON CHAVARRO; CERESINI, PAULO C.; MOLINA, LINA M. RAMOS; PEREIRA, DANILO A. S.; SCHURT, DANIEL A.; VIEIRA, JR., JOSE R.; POLONI, NADIA M.; MCDONALD, BRUCE A.. The Urochloa Foliar Blight and Collar Rot Pathogen Rhizoctonia solani AG-1 IA Emerged in South America Via a Host Shift from Rice. PHYTOPATHOLOGY, v. 105, n. 11, p. 1475-1486, . (13/11944-0, 11/23050-8, 11/50150-3)
Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
MESA, Edisson Chavarro. A origem de populações emergentes do patógeno da queima-da-folha (Rhizoctonia solani AG-1 IA) da Urochloa spp. na Amazônia e seu potencial de adaptação a outros agroecossistemas brasileiros. 2015. Doctoral Thesis - Universidade Estadual Paulista (Unesp). Faculdade de Ciências Agrárias e Veterinárias. Jaboticabal Jaboticabal.

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