Data/hora: 12/06/2024 08:30:28

Provedor de dados: | 88
País: | Brazil
Título: | Evidence of natural hybridization and introgression in Bulbophyllum involutum Borba, Semir &amp;amp; F. Barros and B. weddellii (Lindl.) Rchb. f. (Orchidaceae) in the Chapada Diamantina, Brazil, by using allozyme markers
Autores: | Azevedo,Cecília O.; Borba,Eduardo L.; Van Den Berg,Cássio.
Data: | 2006-09-01
Ano: | 2006
Palavras-chave: | Bulbophyllum; Genetic variability; Hybridization; Introgression; Orchidaceae.
Resumo: | Hybridization between B. involutum and B. weddellii (Orchidaceae) has been first observed in the Serra do Cipó, Minas Gerais State, Brazil, the hybrid being described as B. ×cipoense Borba &amp;amp; Semir. In this study, allozime electrophoresis was used to test the hypothesis of occurrence of hybridization between these two species, as suggested by morphological characters, in the Chapada Diamantina, Bahia State, Brazil. The lack of a diagnostic locus does not allow definite confirmation of the natural hybridization, although this hypotheses is reinforced by the absence of exclusive alleles in the putative hybrid individuals. The existence of several different genotypes points out to either population derived from multiple hybridization events or the hybrids produced offspring. Homozigosity in some morphologically intermediate individuals of alelles which are exclusive to B. involutum and high genetic similarity between them reinforce the hypotheses of introgression in B. involutum, but not in B. weddellii. Genetic variability observed in B. weddellii (He = 0.21) and B. involutum (He = 0.35) is high. Bulbophyllum weddellii and B. involutum presented very high genetic similarity values (0.94). These species, although vegetatively similar, have been placed in different sections based on floral morphology. The results suggest that these species may be more related than previously supposed.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042006000300008
Editor: | Sociedade Botânica de São Paulo
Relação: | 10.1590/S0100-84042006000300008
Formato: | text/html
Fonte: | Brazilian Journal of Botany  v.29 n.3 2006
Fonte: | info:eu-repo/semantics/openAccess