Data/hora: 13/06/2024 08:08:34

Biblioteca(s): | Embrapa Unidades Centrais.
Data corrente: | 25/08/2005
Data da última atualização: | 20/08/2018
Autoria: | CARVALHO, J. F. R. P. de; ROBINSON, I. P.; ALFENAS, A. C.
Afiliação: | Jane Fiuza Rodrigues Portela de Carvalho, Instituto Agronômico do Paraná - IAPAR/Laboratório de Biotecnologia; Ingrid Peters Robinson, State University of New York/University at Albany/Biological Sciences; Acelino Couto Alfenas, Universidade Federal de Viçosa - UFV/Departamento de Fitopatologia/Bioagro.
Título: | Isozymic variability in a Brazilian collection of annatto (Bixa orellana L.).
Ano de publicação: | 2005
Fonte/Imprenta: | Pesquisa Agropecuária Brasileira, Brasília, DF, v. 40, n. 7, p. 653-660, jul. 2005
Idioma: | Inglês
Notas: | Título em português: Variabilidade isoenzimática em uma coleção brasileira de urucum (Bixa orellana L.)
Conteúdo: | The objectives of this work were to optimize the isozyme electrophoresis technique for Bixa orellana, and use isozyme markers for a preliminary survey on the genetic variability in Brazilian annatto germplasm accessions. Collection consisted of seed samples from sixty open pollinated trees, representing two Northern and four Southern geographic provenances. The extraction, electrophoresis, and interpretation of annatto isozymes are described. Three out of the twenty-one identified isozyme loci were polymorphic in the collection. The percentage of polymorphic loci (P = 21.05) and the expected heterozygosity in annatto (HT = 0.064) were low, compared to other tropical woody species. A UPGMA phenogram, constructed with Nei's genetic distances, clearly separated the germplasm provenant from North and Central Brazil. Variability was significantly higher among the accessions from Maranhão. A sharp genetic differentiation was detected between accessions from Maranhão and Pará States, despite their geographical proximity. The distinctive isozyme polymorphism, observed in the accessions from Maranhão, together with reports on local morphological heterogeneity in annatto fruit shape, color, and pubescence, calls for more detailed genetic and taxonomic investigation.
Palavras-Chave: | allozyme; aloenzima; dendrograma; genetic variability; lipstick plant; phenogram; variabilidade genética.
Thesagro: | Germoplasma; Urucum.
Thesaurus Nal: | germplasm.
Categoria do assunto: | --
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/107731/1/Isozymic.pdf
Registro original: | Embrapa Unidades Centrais (AI-SEDE)
Exemplares: | AI-SEDE - (32380-1) - UPE - AP - PP - 630.72081 - P474 -  - DIS