Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil

Detalhes bibliográficos
Autor(a) principal: Soares,Sabrina Delgado
Data de Publicação: 2020
Outros Autores: Bandeira,Ludmila Ferreira, Ribeiro,Stela Barros, Telles,Mariana Pires de Campos, Silva,João Augusto da, Borges,Canrobert Tormin, Coelho,Alexandre Siqueira Guedes, Novaes,Evandro
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Genetics and Molecular Biology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400301
Resumo: Abstract Given its high-valued wood, the African mahogany (Khaya grandifoliola) has been envisaged as a renewable source of tropical hardwoods in Brazil. However, there are concerns about the hypothesized low diversity among the few K. grandifoliola germplasm sources introduced in the country. Using eight microsatellite markers, we evaluated the genetic diversity and divergence among 53 superior trees selected from three provenances of K. grandifoliola located in the state of Para. These populations are among the oldest plantations (>15 years) in Brazil and, therefore, the country's main seed sources. The average number of alleles per locus was 5.9, expected heterozygosity was moderate (^=0.56) and lower than the high observed heterozygosity (HO=0.74). Therefore, the intrapopulation fixation index was negative (f=-0.31) indicating the possibility that selection of superior trees might have favored heterozygous plants with heterosis. No genetic structure was observed between provenances. The genetic diversity observed within selected trees, with an effective population size (Ne) of 30.4, is comparable to that of natural populations of African and Brazilian mahoganies. Therefore, our results contradict the idea that the genetic diversity of K. grandifoliola introduced in Brazil is low and show that our germplasm can be exploited for breeding purposes.
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spelling Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in BrazilMicrosatellitesSSRgenetic structuregenetic divergencehardwoodAbstract Given its high-valued wood, the African mahogany (Khaya grandifoliola) has been envisaged as a renewable source of tropical hardwoods in Brazil. However, there are concerns about the hypothesized low diversity among the few K. grandifoliola germplasm sources introduced in the country. Using eight microsatellite markers, we evaluated the genetic diversity and divergence among 53 superior trees selected from three provenances of K. grandifoliola located in the state of Para. These populations are among the oldest plantations (>15 years) in Brazil and, therefore, the country's main seed sources. The average number of alleles per locus was 5.9, expected heterozygosity was moderate (^=0.56) and lower than the high observed heterozygosity (HO=0.74). Therefore, the intrapopulation fixation index was negative (f=-0.31) indicating the possibility that selection of superior trees might have favored heterozygous plants with heterosis. No genetic structure was observed between provenances. The genetic diversity observed within selected trees, with an effective population size (Ne) of 30.4, is comparable to that of natural populations of African and Brazilian mahoganies. Therefore, our results contradict the idea that the genetic diversity of K. grandifoliola introduced in Brazil is low and show that our germplasm can be exploited for breeding purposes.Sociedade Brasileira de Genética2020-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400301Genetics and Molecular Biology v.43 n.2 2020reponame:Genetics and Molecular Biologyinstname:Sociedade Brasileira de Genética (SBG)instacron:SBG10.1590/1678-4685-gmb-2018-0162info:eu-repo/semantics/openAccessSoares,Sabrina DelgadoBandeira,Ludmila FerreiraRibeiro,Stela BarrosTelles,Mariana Pires de CamposSilva,João Augusto daBorges,Canrobert TorminCoelho,Alexandre Siqueira GuedesNovaes,Evandroeng2020-04-22T00:00:00Zoai:scielo:S1415-47572020000400301Revistahttp://www.gmb.org.br/ONGhttps://old.scielo.br/oai/scielo-oai.php||editor@gmb.org.br1678-46851415-4757opendoar:2020-04-22T00:00Genetics and Molecular Biology - Sociedade Brasileira de Genética (SBG)false
dc.title.none.fl_str_mv Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
title Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
spellingShingle Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
Soares,Sabrina Delgado
Microsatellites
SSR
genetic structure
genetic divergence
hardwood
title_short Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
title_full Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
title_fullStr Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
title_full_unstemmed Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
title_sort Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
author Soares,Sabrina Delgado
author_facet Soares,Sabrina Delgado
Bandeira,Ludmila Ferreira
Ribeiro,Stela Barros
Telles,Mariana Pires de Campos
Silva,João Augusto da
Borges,Canrobert Tormin
Coelho,Alexandre Siqueira Guedes
Novaes,Evandro
author_role author
author2 Bandeira,Ludmila Ferreira
Ribeiro,Stela Barros
Telles,Mariana Pires de Campos
Silva,João Augusto da
Borges,Canrobert Tormin
Coelho,Alexandre Siqueira Guedes
Novaes,Evandro
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Soares,Sabrina Delgado
Bandeira,Ludmila Ferreira
Ribeiro,Stela Barros
Telles,Mariana Pires de Campos
Silva,João Augusto da
Borges,Canrobert Tormin
Coelho,Alexandre Siqueira Guedes
Novaes,Evandro
dc.subject.por.fl_str_mv Microsatellites
SSR
genetic structure
genetic divergence
hardwood
topic Microsatellites
SSR
genetic structure
genetic divergence
hardwood
description Abstract Given its high-valued wood, the African mahogany (Khaya grandifoliola) has been envisaged as a renewable source of tropical hardwoods in Brazil. However, there are concerns about the hypothesized low diversity among the few K. grandifoliola germplasm sources introduced in the country. Using eight microsatellite markers, we evaluated the genetic diversity and divergence among 53 superior trees selected from three provenances of K. grandifoliola located in the state of Para. These populations are among the oldest plantations (>15 years) in Brazil and, therefore, the country's main seed sources. The average number of alleles per locus was 5.9, expected heterozygosity was moderate (^=0.56) and lower than the high observed heterozygosity (HO=0.74). Therefore, the intrapopulation fixation index was negative (f=-0.31) indicating the possibility that selection of superior trees might have favored heterozygous plants with heterosis. No genetic structure was observed between provenances. The genetic diversity observed within selected trees, with an effective population size (Ne) of 30.4, is comparable to that of natural populations of African and Brazilian mahoganies. Therefore, our results contradict the idea that the genetic diversity of K. grandifoliola introduced in Brazil is low and show that our germplasm can be exploited for breeding purposes.
publishDate 2020
dc.date.none.fl_str_mv 2020-01-01
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dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/1678-4685-gmb-2018-0162
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dc.publisher.none.fl_str_mv Sociedade Brasileira de Genética
publisher.none.fl_str_mv Sociedade Brasileira de Genética
dc.source.none.fl_str_mv Genetics and Molecular Biology v.43 n.2 2020
reponame:Genetics and Molecular Biology
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