A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population

Detalhes bibliográficos
Autor(a) principal: Santiago, Thaís Ribeiro
Data de Publicação: 2014
Tipo de documento: Tese
Idioma: eng
Título da fonte: LOCUS Repositório Institucional da UFV
Texto Completo: http://www.locus.ufv.br/handle/123456789/6315
Resumo: Bacterial wilt, caused by the Ralstonia solanacearum, cause direct and indirect losses in several crops. Planting of resistant varieties is the best option for disease management, but reports of resistance breakdown are commonly found in the literature. Although many years have passed after the first report of this pathogen in Brazil, information on biovars, phylotypes, sequevars and genetic variability of the pathogen is scarce. In the present study isolates were characterized as biovar 1, 2 and 3. Phylotype II is spread throughout Brazil and phylotype I is predominantly found in the North. Seven sequevars were identified: 1, 4, 18, 27, 28, 41 and 50. Moreover, we classified four new sequevars in the phylotype IIB as sequevar 53, 54, 55 and 56. Initially, we used rep-PCR to estimate the variability of the pathogen and 282 haplotypes were obtained. The high number of haplotypes could be due to the occurrence of recombination. Isolates of the South/Southeast/Central regions formed a genetically related cluster. Isolates from the North/Northeast regions formed another group. Gene flow occurs through the transportation of contaminated tubers and seedlings. Genetic differentiation was detected among isolates from tomato and potato collected in the South/Central/Southeast regions. In addition, gene genealogies based on the coalescent process were used to infer about evolutionary mechanisms. We detected evidence of subdivision of phylotypes I, IIA and IIB, but no subdivision by hosts. The gene flow is predominantly from the southern to the northern regions. We confirmed that phylotype II is an ancestral lineage that originated in Brazil and probably phylotype I was recently introduced by anthropogenic actions. Phylotype IIA originated phylotype IIB and this difference was probably due to ecological factors that need to be studied in more detail. Mutation, migration, recombination and selection occur in the population of R. solanacearum in Brazil, however mutation is more important than recombination. We conclude that the use of resistant varieties is a major challenge in all regions and hosts.
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spelling A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the populationUma análise profunda da estrutura genética de Ralstonia solanacearum no Brasil revela não muito sexo na populaçãoMurcha bacterianaRalstonia solanacearumGenética das populaçõesVariabilidadeFitopatologiaBacterial wilt, caused by the Ralstonia solanacearum, cause direct and indirect losses in several crops. Planting of resistant varieties is the best option for disease management, but reports of resistance breakdown are commonly found in the literature. Although many years have passed after the first report of this pathogen in Brazil, information on biovars, phylotypes, sequevars and genetic variability of the pathogen is scarce. In the present study isolates were characterized as biovar 1, 2 and 3. Phylotype II is spread throughout Brazil and phylotype I is predominantly found in the North. Seven sequevars were identified: 1, 4, 18, 27, 28, 41 and 50. Moreover, we classified four new sequevars in the phylotype IIB as sequevar 53, 54, 55 and 56. Initially, we used rep-PCR to estimate the variability of the pathogen and 282 haplotypes were obtained. The high number of haplotypes could be due to the occurrence of recombination. Isolates of the South/Southeast/Central regions formed a genetically related cluster. Isolates from the North/Northeast regions formed another group. Gene flow occurs through the transportation of contaminated tubers and seedlings. Genetic differentiation was detected among isolates from tomato and potato collected in the South/Central/Southeast regions. In addition, gene genealogies based on the coalescent process were used to infer about evolutionary mechanisms. We detected evidence of subdivision of phylotypes I, IIA and IIB, but no subdivision by hosts. The gene flow is predominantly from the southern to the northern regions. We confirmed that phylotype II is an ancestral lineage that originated in Brazil and probably phylotype I was recently introduced by anthropogenic actions. Phylotype IIA originated phylotype IIB and this difference was probably due to ecological factors that need to be studied in more detail. Mutation, migration, recombination and selection occur in the population of R. solanacearum in Brazil, however mutation is more important than recombination. We conclude that the use of resistant varieties is a major challenge in all regions and hosts.A murcha bacteriana, causada por Ralstonia solanacearum, causa perdas diretas e indiretas na produção de várias culturas. Apesar de o uso de variedades resistentes ser a melhor opção para o manejo da doença, nãoraro encontram-se relatos de suplantação da resistência. O primeiro relato de murcha bacteriana no Brasil é antigo, porém pouco se conhece sobre os biovares, filotipos, sequevares e variabilidade genética do patógeno. Por essa razão realizou-se o presente estudo. Isolados brasileiros de R.solanacearum foram caracterizados como biovar 1, 2 e 3, filotipo II, que está disperso por todo o país e filotipo I, que encontra-se predominantemente na região Norte. Sete sequevares foram identificados: 1, 4, 18, 27, 28, 41 e 50. Além disso, nós classificamos quatro novos sequevares no filotipo IIB como sequevar 53, 54, 55 e 56. Inicialmente, utilizou-se rep-PCR para estimar a variabilidade. Obtiveram- se 282 haplótipos. Uma possível explicação para o alto número de haplótipos é a ocorrência de recombinação. Isolados das regiões Sul, Sudeste e Central formam um grande grupo genético, enquanto aqueles das regiões Norte e Nordeste formam outro grupo. Tal fato evidencia fluxo gênico entre essas regiões, provavelmente mediado pelo transporte de tubérculos e mudas contaminadas. Detectou-se diferenciação genética entre isolados de tomate e batata coletados na região Sul-Sudeste-Central. Os mecanismos evolutivos foram parametrizados a partir de análises de genealogia de genes por processo coalescente utilizando sequências parciais de sete genes. Detectou- se evidência de subdivisão dos filotipos I, IIA e IIB, mas não subdivisão por hospedeiro. O fluxo gênico é mais intenso da região Sul para a região Norte. O filotipo II é uma linhagem ancestral que teve origem no Brasil e o filotipo I foi recentemente introduzido, possivelmente por ação antropogênica. O filotipo IIA deu origem ao filotipo IIB e essa diferenciação ocorreu possivelmente devido a fatores ecológicos que precisam ser eBacterial wilt, caused by the Ralstonia solanacearum, cause direct and indirect losses in several crops. Planting of resistant varieties is the best option for disease management, but reports of resistance breakdown are commonly found in the literature. Although many years have passed after the first report of this pathogen in Brazil, information on biovars, phylotypes, sequevars and genetic variability of the pathogen is scarce. In the present study isolates were characterized as biovar 1, 2 and 3. Phylotype II is spread throughout Brazil and phylotype I is predominantly found in the North. Seven sequevars were identified: 1, 4, 18, 27, 28, 41 and 50. Moreover, we classified four new sequevars in the phylotype IIB as sequevar 53, 54, 55 and 56. Initially, we used rep-PCR to estimate the variability of the pathogen and 282 haplotypes were obtained. The high number of haplotypes could be due to the occurrence of recombination. Isolates of the South/Southeast/Central regions formed a genetically related cluster. Isolates from the North/Northeast regions formed another group. Gene flow occurs through the transportation of contaminated tubers and seedlings. Genetic differentiation was detected among isolates from tomato and potato collected in the South/Central/Southeast regions. In addition, gene genealogies based on the coalescent process were used to infer about evolutionary mechanisms. We detected evidence of subdivision of phylotypes I, IIA and IIB, but no subdivision by hosts. The gene flow is predominantly from the southern to the northern regions. We confirmed that phylotype II is an ancestral lineage that originated in Brazil and probably phylotype I was recently introduced by anthropogenic actions. Phylotype IIA originated phylotype IIB and this difference was probably due to ecological factors that need to be studied in more detail. Mutation, migration, recombination and selection occur in the population of R. solanacearum in Brazil, however mutation is more important than recombination. We conclude that the use of resistant varieties is a major challenge in all regions and hosts. studados com mais detalhes futuramente. Detectaram-se evidências de mutação, migração, recombinação e seleção na população de R.solanacearum no Brasil. Entretanto, mutação é mais importante que recombinação. Conclui-se que a utilização de variedades resistentes será uma grande desafio em todas regiões e hospedeiros.Fundação de Amparo à Pesquisa do Estado de Minas GeraisUniversidade Federal de ViçosaMizubuti, Eduardo Seiti Gomidehttp://lattes.cnpq.br/3153190179798999Lopes, Carlos AlbertoOliveira, José Rogério deSantiago, Thaís Ribeiro2015-10-19T13:25:55Z2015-10-19T13:25:55Z2014-08-22info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/doctoralThesisapplication/pdfSANTIAGO, Thaís Ribeiro. A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population. 2014. 74 f. Tese (Doutorado em Fitopatologia) - Universidade Federal de Viçosa, Viçosa. 2014.http://www.locus.ufv.br/handle/123456789/6315enginfo:eu-repo/semantics/openAccessreponame:LOCUS Repositório Institucional da UFVinstname:Universidade Federal de Viçosa (UFV)instacron:UFV2016-04-13T02:04:10Zoai:locus.ufv.br:123456789/6315Repositório InstitucionalPUBhttps://www.locus.ufv.br/oai/requestfabiojreis@ufv.bropendoar:21452016-04-13T02:04:10LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)false
dc.title.none.fl_str_mv A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population
Uma análise profunda da estrutura genética de Ralstonia solanacearum no Brasil revela não muito sexo na população
title A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population
spellingShingle A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population
Santiago, Thaís Ribeiro
Murcha bacteriana
Ralstonia solanacearum
Genética das populações
Variabilidade
Fitopatologia
title_short A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population
title_full A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population
title_fullStr A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population
title_full_unstemmed A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population
title_sort A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population
author Santiago, Thaís Ribeiro
author_facet Santiago, Thaís Ribeiro
author_role author
dc.contributor.none.fl_str_mv Mizubuti, Eduardo Seiti Gomide
http://lattes.cnpq.br/3153190179798999
Lopes, Carlos Alberto
Oliveira, José Rogério de
dc.contributor.author.fl_str_mv Santiago, Thaís Ribeiro
dc.subject.por.fl_str_mv Murcha bacteriana
Ralstonia solanacearum
Genética das populações
Variabilidade
Fitopatologia
topic Murcha bacteriana
Ralstonia solanacearum
Genética das populações
Variabilidade
Fitopatologia
description Bacterial wilt, caused by the Ralstonia solanacearum, cause direct and indirect losses in several crops. Planting of resistant varieties is the best option for disease management, but reports of resistance breakdown are commonly found in the literature. Although many years have passed after the first report of this pathogen in Brazil, information on biovars, phylotypes, sequevars and genetic variability of the pathogen is scarce. In the present study isolates were characterized as biovar 1, 2 and 3. Phylotype II is spread throughout Brazil and phylotype I is predominantly found in the North. Seven sequevars were identified: 1, 4, 18, 27, 28, 41 and 50. Moreover, we classified four new sequevars in the phylotype IIB as sequevar 53, 54, 55 and 56. Initially, we used rep-PCR to estimate the variability of the pathogen and 282 haplotypes were obtained. The high number of haplotypes could be due to the occurrence of recombination. Isolates of the South/Southeast/Central regions formed a genetically related cluster. Isolates from the North/Northeast regions formed another group. Gene flow occurs through the transportation of contaminated tubers and seedlings. Genetic differentiation was detected among isolates from tomato and potato collected in the South/Central/Southeast regions. In addition, gene genealogies based on the coalescent process were used to infer about evolutionary mechanisms. We detected evidence of subdivision of phylotypes I, IIA and IIB, but no subdivision by hosts. The gene flow is predominantly from the southern to the northern regions. We confirmed that phylotype II is an ancestral lineage that originated in Brazil and probably phylotype I was recently introduced by anthropogenic actions. Phylotype IIA originated phylotype IIB and this difference was probably due to ecological factors that need to be studied in more detail. Mutation, migration, recombination and selection occur in the population of R. solanacearum in Brazil, however mutation is more important than recombination. We conclude that the use of resistant varieties is a major challenge in all regions and hosts.
publishDate 2014
dc.date.none.fl_str_mv 2014-08-22
2015-10-19T13:25:55Z
2015-10-19T13:25:55Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
status_str publishedVersion
dc.identifier.uri.fl_str_mv SANTIAGO, Thaís Ribeiro. A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population. 2014. 74 f. Tese (Doutorado em Fitopatologia) - Universidade Federal de Viçosa, Viçosa. 2014.
http://www.locus.ufv.br/handle/123456789/6315
identifier_str_mv SANTIAGO, Thaís Ribeiro. A deep analysis of the genetic structure of Ralstonia solanacearum in Brazil reveals not much sex in the population. 2014. 74 f. Tese (Doutorado em Fitopatologia) - Universidade Federal de Viçosa, Viçosa. 2014.
url http://www.locus.ufv.br/handle/123456789/6315
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal de Viçosa
publisher.none.fl_str_mv Universidade Federal de Viçosa
dc.source.none.fl_str_mv reponame:LOCUS Repositório Institucional da UFV
instname:Universidade Federal de Viçosa (UFV)
instacron:UFV
instname_str Universidade Federal de Viçosa (UFV)
instacron_str UFV
institution UFV
reponame_str LOCUS Repositório Institucional da UFV
collection LOCUS Repositório Institucional da UFV
repository.name.fl_str_mv LOCUS Repositório Institucional da UFV - Universidade Federal de Viçosa (UFV)
repository.mail.fl_str_mv fabiojreis@ufv.br
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