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Pollination ecology of Isoglossa woodii, a long-lived, synchronously monocarpic herb from coastal forests in South Africa

Griffiths, ME, Tsvuura, Z., Franklin, D. C. and Lawes, M. J. (2010). Pollination ecology of Isoglossa woodii, a long-lived, synchronously monocarpic herb from coastal forests in South Africa. Plant Biology,12(3):495-502.

Document type: Journal Article

ISI LOC 000276618400013
IRMA ID 81704288xPUB96
Title Pollination ecology of Isoglossa woodii, a long-lived, synchronously monocarpic herb from coastal forests in South Africa
Author Griffiths, ME
Tsvuura, Z.
Franklin, D. C.
Lawes, M. J.
Journal Name Plant Biology
Publication Date 2010
Volume Number 12
Issue Number 3
ISSN 1435-8603   (check CDU catalogue open catalogue search in new window)
Scopus ID 2-s2.0-77955801310
Start Page 495
End Page 502
Total Pages 8
Place of Publication United Kingdom
Publisher Wiley-Blackwell Publishing Ltd.
HERDC Category C1 - Journal Article (DIISR)
Abstract Synchronous monocarpy in long-lived plants is often associated with pollination by wind, in part because infrequent mass flowering may satiate pollinators. Selfing in synchronous monocarps may provide reproductive assurance but conflict with the benefits of outcrossing, a key evolutionary driver of synchrony. We predicted that animal-pollinated species with synchronous flowering would have unspecialised flowers and attract abundant generalised pollinators, but predictions for selfing and outcrossing frequencies were not obvious. We examined the pollination biology of Isoglossa woodii (Acanthaceae), an insect-pollinated, monocarpic herb that flowers synchronously at 4-7-year intervals. The most frequent visitor to I. woodii flowers was the African honeybee, Apis mellifera adansonii. Hand-pollination failed to enhance seed production, indicating that the pollinators were not saturated. No seed was set in the absence of pollinators. Seed set was similar among selfed and outcrossed flowers, demonstrating a geitonogamous mixed-mating strategy with no direct evidence of preferential outcrossing. Flowers contained four ovules, but most fruits only developed one seed, raising the possibility that preferential outcrossing occurs by post-pollination processes. We argue that a number of the theoretical concerns about geitonogamous selfing as a form of reproductive assurance do not apply to a long-lived synchronous monocarp such as I. woodii.
Keywords Apis mellifera adansonii
Breeding system
Flowering synchrony
Fruit and seed set
Insect pollination
Mixed mating system
Nectar production
Semelparity
DOI http://dx.doi.org/10.1111/j.1438-8677.2009.00222.x   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
 
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