Interspecific differentiation and hybridization in Vanilla species (Orchidaceae)

Vanilla claviculata, V. barbellata and V. dilloniana are distributed throughout the Caribbean islands and are all found in Puerto Rico. The vegetative parts of the species are similar; however, their conspicuous flowers easily distinguish them. Electrophoresis of seven polymorphic enzymes revealed t...

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Bibliographic Details
Published in:Heredity 1999-11, Vol.83 (5), p.560-567
Main Authors: Nielsen, L.R, Siegismund, H.R
Format: Article
Language:English
Subjects:
alleles
Biomedical and Life Sciences
Biomedicine
Cytogenetics
Ecology
enzyme polymorphism
Evolutionary Biology
gene frequency
genotype
Human Genetics
identification
interspecific hybridization
isozymes
loci
original-article
Plant Genetics and Genomics
population
species differences
vanilla
Vanilla barbellata
Vanilla claviculata
Vanilla dilloniana
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Summary:Vanilla claviculata, V. barbellata and V. dilloniana are distributed throughout the Caribbean islands and are all found in Puerto Rico. The vegetative parts of the species are similar; however, their conspicuous flowers easily distinguish them. Electrophoresis of seven polymorphic enzymes revealed that the genetic composition of the three species is also very similar: they deviate mainly from each other in allele frequencies rather than by specific alleles. A hierarchical analysis of genetic differentiation showed that the between-species component is slightly higher (F(SG) = 0.237) than the component between populations within species (F(PS) = 0.141). Nevertheless, they are efficiently recognized by their genotypic compositions. In V. barbellata and V. claviculata 97-99% of all individuals were assigned to the correct species. Assignment to a wrong species occurred only with individuals at localities where species coexist. This suggests that the species may hybridize.
ISSN:0018-067X
1365-2540
DOI:10.1038/sj.hdy.6885880