Data/hora: 11/06/2024 14:54:56

Provedor de dados: | 74
País: | Brazil
Título: | Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
Autores: | 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.
Data: | 2020-01-01
Ano: | 2020
Palavras-chave: | Microsatellites; SSR; Genetic structure; Genetic divergence; Hardwood.
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 (&gt;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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572020000400301
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/1678-4685-gmb-2018-0162
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.43 n.2 2020
Fonte: | info:eu-repo/semantics/openAccess