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Please use this identifier to cite or link to this item: http://hdl.handle.net/2262/24279

Title: Reproductive biology of the invasive exotic shrub, Rhododendron ponticum L. (Ericaceae)
Author: STOUT, JANE CATHERINE
Sponsor: Enterprise Ireland
Author's Homepage: http://people.tcd.ie/stoutj
Keywords: fruit set
hand pollination
inbreeding
invasion
outcrossing
pollination
seed production
Issue Date: 2007
Publisher: Blackwell
Citation: Stout, J.C. ‘Reproductive biology of the invasive exotic shrub, Rhododendron ponticum L. (Ericaceae)’ in Botanical Journal of the Linnean Society, 155, (3), 2007, pp 373 - 381
Series/Report no.: Botanical Journal of the Linnean Society
155
3
Abstract: The reproductive biology of an exotic species will affect its ability to become naturalized and invasive in non-native habitats. Rhododendron ponticum is an ecologically damaging exotic weed in the British Isles, which spreads predominantly by seed. I investigated how inbreeding and outcrossing affect seed production and germination in a wild population of this species in Ireland. Experimental manipulations revealed low fruit and seed set when insects were excluded from flowers, suggesting that this species has limited capability for spontaneous autogamy. Hand-pollination treatments showed that, although flowers are self-compatible (with self and same plant pollen), higher levels of seed set occur following outcrossing (xenogamy). There was no significant difference in rate of germination of seeds from inbred or outcrossed treatments. The addition of xenogamous pollen to open flowers did not increase fruit or seed set, suggesting that flowers in this population are not pollen limited: native generalist pollinators, mainly bumblebees (Bombus spp.), are providing an adequate pollinator service. This work demonstrates that outcrossing increases seed set and pollinators are required to facilitate this. Hence, generalist native pollinators can promote invasion by exotic plants. Native pollinators can clearly play an important part in alien species invasion.
Description: PUBLISHED
URI: http://www.blackwell-synergy.com/doi/pdf/10.1111/j.1095-8339.2007.00719.x
http://hdl.handle.net/2262/24279
ISSN: 0024-4074
Appears in Collections:Botany (Scholarly Publications)

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