Mating patterns and genetic diversity in the wild daffodil Narcissus longispathus (Amaryllidaceae).
Heredity (Edinb)
; 92(5): 459-65, 2004 May.
Article
em En
| MEDLINE
| ID: mdl-15014425
ABSTRACT
Despite the importance of Narcissus to ornamental horticulture, there have been no population genetic studies of wild species, many of which have narrow distributions. Here, we measure selfing rates and levels of genetic diversity at allozyme loci in six populations of Narcissus longispathus, a self-compatible daffodil endemic to a few mountain ranges in southeastern Spain. The populations were distributed among four distinct river valleys encompassing two main watersheds in the Sierra de Cazorla mountains. Selfing rates averaged 0.37 (range 0.23-0.46), resulting in significant inbreeding coefficients for the progeny (f = 0.324). In contrast, estimates of inbreeding in parental genotypes were not significantly different from zero (f = 0.001), indicating that few selfed offspring survive to maturity because of inbreeding depression. Species-wide estimates of genetic diversity for the six populations were P(s) = 0.38, H(es) = 0.119 and A(s) = 1.27 with significant genetic differentiation among populations theta = 0.15. The observed patterns of genetic differentiation among populations are likely influenced by the mating system, and a combination of local topography, watershed affinities and gene flow.
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Base de dados:
MEDLINE
Assunto principal:
Variação Genética
/
Narcissus
/
Endogamia
Idioma:
En
Ano de publicação:
2004
Tipo de documento:
Article