title: Contrasting genetic structure between two begomoviruses infecting the same leguminous hosts.
abstract: Begomoviruses are whitefly-transmitted, ssDNA plant viruses and are among the most damaging pathogens causing epidemics in economically important crops worldwide. Wild/non-cultivated plants play a crucial epidemiological role, acting as begomovirus reservoirs and as 'mixing vessels' where recombination can occur. Previous work suggests a higher degree of genetic variability in begomovirus populations from non-cultivated hosts compared with cultivated hosts. To assess this supposed host effect on the genetic variability of begomovirus populations, cultivated (common bean, Phaseolus vulgaris, and lima bean, Phaseolus lunatus) and non-cultivated (Macroptilium lathyroides) legume hosts were sampled from two regions of Brazil. A total of 212 full-length DNA-A genome segments were sequenced from samples collected between 2005 and 2012, and populations of the begomoviruses Bean golden mosaic virus (BGMV) and Macroptilium yellow spot virus (MaYSV) were obtained. We found, for each begomovirus species, similar genetic variation between populations infecting cultivated and non-cultivated hosts, indicating that the presumed genetic variability of the host did not a priori affect viral variability. We observed a higher degree of genetic variation in isolates from MaYSV populations than BGMV populations, which was explained by numerous recombination events in MaYSV. MaYSV and BGMV showed distinct distributions of genetic variation, with the BGMV population (but not MaYSV) being structured by both host and geography.
authors.affiliation: Departamento de Fitopatologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil.
authors.forename: Roberto Ramos
authors.initials: RR
authors.lastname: Sobrinho
authors.affiliation: Departamento de Fitopatologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil.
authors.forename: César Augusto Diniz
authors.initials: CAD
authors.lastname: Xavier
authors.affiliation: Departamento de Fitopatologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil.
authors.forename: Hermano Monteiro de Barros
authors.initials: HMB
authors.lastname: Pereira
authors.affiliation: Departamento de Fitossanidade/CECA, Universidade Federal de Alagoas, Rio Largo, AL 57100-000, Brazil.
authors.forename: Gaus Silvestre de Andrade
authors.initials: GSA
authors.lastname: Lima
authors.affiliation: Departamento de Fitossanidade/CECA, Universidade Federal de Alagoas, Rio Largo, AL 57100-000, Brazil.
authors.forename: Iraíldes Pereira
authors.initials: IP
authors.lastname: Assunção
authors.affiliation: Departamento de Fitopatologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil.
authors.forename: Eduardo Seiti Gomide
authors.initials: ESG
authors.lastname: Mizubuti
authors.affiliation: Department of Ecology, Evolution and Natural Resources, Rutgers, The State University Of New Jersey, New Brunswick, NJ 08901, USA.
authors.forename: Siobain
authors.initials: S
authors.lastname: Duffy
authors.affiliation: Departamento de Fitopatologia/BIOAGRO, Universidade Federal de Viçosa, Viçosa, MG 36570-900, Brazil.
authors.forename: Francisco Murilo
authors.initials: FM
authors.lastname: Zerbini
mesh_terms: D000818:Animals; D053839:Begomovirus / Q000145:classification / Q000235:genetics* / Q000472:pathogenicity*; D001938:Brazil; D007887:Fabaceae / Q000821:virology*; D014644:Genetic Variation; D016679:Genome, Viral; D006430:Hemiptera / Q000821:virology; D058507:Host Specificity / Q000235:genetics; D054884:Host-Pathogen Interactions / Q000235:genetics; D008969:Molecular Sequence Data; D027805:Phaseolus / Q000821:virology; D010802:Phylogeny; D010935:Plant Diseases / Q000821:virology*; D011995:Recombination, Genetic; D012641:Selection, Genetic