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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

The Urochloa Foliar Blight and Collar Rot Pathogen Rhizoctonia solani AG-1 IA Emerged in South America Via a Host Shift from Rice

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Author(s):
Mesa, Eclisson Chavarro [1] ; Ceresini, Paulo C. [2] ; Molina, Lina M. Ramos [1] ; Pereira, Danilo A. S. [2] ; Schurt, Daniel A. [3] ; Vieira, Jr., Jose R. [4] ; Poloni, Nadia M. [2] ; McDonald, Bruce A. [5]
Total Authors: 8
Affiliation:
[1] Univ Sao Paulo State, UNESP, Sao Paulo, SP - Brazil
[2] Univ Estadual Paulista, Sao Paulo, SP - Brazil
[3] EMBRAPA Brazilian Agr Res Corp, Boa Vista, RR - Brazil
[4] EMBRAPA, Porto Velho, RO - Brazil
[5] Swiss Fed Inst Technol, Inst Integrat Biol, Zurich - Switzerland
Total Affiliations: 5
Document type: Journal article
Source: PHYTOPATHOLOGY; v. 105, n. 11, p. 1475-1486, NOV 2015.
Web of Science Citations: 5
Abstract

The fungus Rhizoctonia solani anastomosis group (AG)-1 IA emerged in the early 1990s as an important pathogen causing foliar blight and collar rot on pastures of the genus Urochloa (signalgrass) in South America. We tested the hypothesis that this pathogen emerged following a host shift or jump as a result of geographical overlapping of host species. The genetic structure of host and regional populations of R. solani AG-1 IA infecting signalgrass, rice, and soybean in Colombia and Brazil was analyzed using nine microsatellite loci in 350 isolates to measure population differentiation and infer the pathogen reproductive system. Phylogeographical analyses based on the microsatellite loci and on three DNA sequence loci were used to infer historical migration patterns and test hypotheses about the origin of the current pathogen populations. Cross pathogenicity assays were conducted to measure the degree of host specialization in populations sampled from different hosts. The combined analyses indicate that the pathogen populations currently infecting Urochloa in Colombia and Brazil most likely originated from a population that originally infected rice. R. solani AG-1 IA populations infecting Urochloa exhibit a mixed reproductive system including both sexual reproduction and long-distance dispersal of adapted clones, most likely on infected seed. The pathogen population on Urochloa has a genetic structure consistent with a high evolutionary potential and showed evidence for host specialization. (AU)

FAPESP's process: 13/11944-0 - Population genetic structure of Rhizoctonia oryzae-sativae from rice in the Paraíba Valley, SP, and adaptive potential of the pathogen to Brachiaria.
Grantee:Danilo Augusto dos Santos Pereira
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 11/23050-8 - 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
Grantee:Edisson Chavarro Mesa
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 11/50150-3 - 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
Grantee:Paulo Cezar Ceresini
Support Opportunities: BIOTA-FAPESP Program - Regular Research Grants