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Open Access item Herkogamy and Mating Patterns in the Self-compatible Daffodil Narcissus longispathus
Herrera, Carlos M.
Barrett, Spencer C.H.
|Keywords:||Allozymes, Amaryllidaceae, anther–stigma separation, floral design, herkogamy, intra- and interpopulation variation, Narcissus longispathus, outcrossing rates|
|Publisher:||Botanical Society of America|
|Citation:||Annals of Botany 95: 1105–1111, 2005|
|Abstract:||• Background and Aims Floral design in self-compatible plants can influence mating patterns. This study invest- igated Narcissus longispathus, a self-compatible bee-pollinated species with wide variation in anther–stigma separation (herkogamy), to determine the relationship between variation in this floral trait and the relative amounts of cross- and self-fertilization.
• Methods Anther–stigma separation was measured in the field in six populations of N. longispathus from south- eastern Spain. Variation in herkogamy during the life of individual flowers was also quantified. Multilocus out-
crossing rates were estimated from plants differing in herkogamy using allozyme markers.
• Key Results Anther–stigma separation varied considerably among flowers within the six populations studied (range =
1–10 mm). This variation was nearly one order of magnitude larger than the slight, statistically non-significant
developmental variation during the lifespan of individual flowers. Estimates of multilocus outcrossing rate for different
herkogamy classes (tm range = 0•49–0•76) failed to reveal a monotonic increase with increasing herkogamy.
• Conclusions It is suggested that the lack of a positive relationship between herkogamy and outcrossing rate, a
result that has not been previously documented for other species, could be mostly related to details of the foraging
behaviour of pollinators.|
|Publisher version (URL):||http://aob.oxfordjournals.org/content/95/7/1105.full.pdf+html|
|Appears in Collections:||(EBD) Artículos|
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