Data/hora: 17/06/2024 04:26:41

Biblioteca(s): | Embrapa Amazônia Oriental.
Data corrente: | 18/03/2008
Data da última atualização: | 23/11/2022
Autoria: | ALVES, R. M.; SEBBENN, A. M.; ARTERO, A. S.; CLEMENT, C.; FIGUEIRA, A.
Afiliação: | RAFAEL MOYSES ALVES, CPATU; Alexandre M. Sebbenn, Instituto Florestal de São Paulo; Angela S. Artero, USP; Charles Clement, Instituto de Pesquisa da Amazônia; Antonio Figueira, USP.
Título: | High levels of genetic divergence and inbreeding in populations of cupuassu (Theobroma grandiflorum).
Ano de publicação: | 2007
Fonte/Imprenta: | Tree Genetics & Genomes, v. 3, n. 4, p. 289-298, out. 2007.
Idioma: | Inglês
Conteúdo: | Theobroma grandiflorum (cupuassu) is an important fruit tree native to the Brazilian Amazon. Establishing the genetic diversity and structure of populations is critical to define long-term strategies for cupuassu conservation presently threatened by rapid deforestation. Three natural populations collected at the putative center of diversity, three groups of accessions established at a germplasm collection, and one derived from commercial plantings were analyzed. The genetic diversity was assessed using 21 polymorphic microsatellite loci originally developed for Theobroma cacao, disclosing a total of 113 alleles. The estimated genetic diversity parameters averaged over cupuassu populations (A?=?3.53 alleles per locus; H e?=?0.426; H o?=?0.346) were lower than the values reported for other Neotropical tree species. The three natural populations presented a positive and significant fixation index (f), ranging from 0.133 to 0.234. Cupuassu apparently adhered to a general pattern of genetic diversity structure of some Neotropical tree species occurring at low densities, with a low intrapopulation genetic diversity and important levels of endogamy, possibly due to biparental inbreeding derived from the presence of spatial genetic structure in the populations. A high level of genetic divergence was detected among the natural populations (? p?=?0.301), a strong differentiation caused by limited gene flow, and suggesting that human interference in spreading and/or stimulating plantings might have had a smaller effect than expected. The approximate location of the T. grandiflorum center of diversity could not be confirmed by analyzing natural populations from the putative region.
Palavras-Chave: | Cupuassu.
Thesagro: | Cupuaçu; Genética; Theobroma Grandiflorum.
Categoria do assunto: | --
Registro original: | Embrapa Amazônia Oriental (CPATU)
Exemplares: | CPATU - (39730-1) - UPC - AP - DD -  -  -  - DIS