Journal Article

Differences in pollen viability in relation to different deceptive pollination strategies in Mediterranean orchids

Francesca Bellusci, Aldo Musacchio, Rossella Stabile and Giuseppe Pellegrino

in Annals of Botany

Published on behalf of The Annals of Botany Company

Volume 106, issue 5, pages 769-774
Published in print November 2010 | ISSN: 0305-7364
Published online August 2010 | e-ISSN: 1095-8290 | DOI: http://dx.doi.org/10.1093/aob/mcq164
Differences in pollen viability in relation to different deceptive pollination strategies in Mediterranean orchids

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  • Ecology and Conservation
  • Evolutionary Biology
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Background and Aims

To date, current research involving pollen viability has been evaluated in a relatively low number of orchid species. In the present study, we focused on five related Mediterranean orchid genera (Anacamptis, Orchis, Dactylorhiza, Ophrys and Serapias) that are characterized by different types of deceptive pollination.

Methods

The in vitro germination ability of increasingly aged pollinaria of eight food-, seven sexually and two shelter-deceptive species was evaluated. Pollination experiments on two food-, one sexually and one shelter-deceptive species were also performed and the percentage of embryonate seeds derived from the increasingly aged pollinaria was checked.

Key Results

All of the examined species showed long-term viabilities (=50 % pollen tube growth) that ranged from 8 to 35 d. Species with the same deceptive pollination strategies exhibited the same pollen viability trends. Interestingly, pollen viabilities of species groups with different deception types have shown significant differences, with sexually and shelter- deceptive species exhibiting a shorter life span than food-deceptive species.

Conclusions

This study confirms the prolonged germination and fertilization capacities of orchid pollinaria, and to our knowledge is the first report demonstrating a clear relationship between pollen viability and pollination system. It is proposed that this relationship is attributed to the different types of reproductive barriers, pre- or post-zygotic, that characterixe Ophrys and Serapias and the food-deceptive species, respectively.

Keywords: Anacamptis; Dactylorhiza; fruit set; Ophrys; Orchis; pollen tube; pollination strategy; seed; Serapias

Journal Article.  3615 words.  Illustrated.

Subjects: Ecology and Conservation ; Evolutionary Biology ; Plant Sciences and Forestry

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