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Abstract Detail



Pollination Biology

Montgomery, Benjamin R. [1], Huang, Shuang-Quan [2], Radich, Andrew J. [3].

Variation in Pollination Syndromes, Mating Systems and Moth Oviposition Preferences for Co-flowering Silene in Yunnan, China.

The pollination biology of Silene is of interest because the genus includes a variety of pollination syndromes, and because some members of the genus are hosts to nursery-pollinating moths, which oviposit during visits. We studied floral traits, nectar production, pollen-to-ovule ratios, pollinator visitation and moth oviposition rates for several co-flowering Silene species in Yunnan, China to investigate the relationships among mating systems, pollination syndromes, and rates of moth visitation and oviposition. Four study species have pendant flowers, suggestive of moth pollination, but of these only S. gracilicaulis has large white petals and copious nocturnal nectar production. Silene chungtienensis has smaller petals and less nectar production, and both S. huguettiae and S. nepalensis have small or non-apparent petals and little or no nectar production. Of the remaining species, S. asclepiadae has horizontally oriented flowers and a tubular shape and S. yunnanensis has upward oriented flowers with large pink petals. Pollen-to-ovule ratios were highest for S. gracilicaulis and S. yunnanensis, suggesting mixed mating; intermediate for S. chungtienensis and S. asclepiadae, suggesting facultative autogamy, and low for S. huguettiae and S. chungtienensis, suggesting autogamy. Silene gracilicaulis recieved a higher rate of moth visits than S. chungtienensis and no visits were observed for S. huguettiae or S. nepalensis. Both S. ascplepiadae and S. yunnanensis were visited by a variety of pollinators, but Bombus and solitary bees visited S. asclepiadae at a higher rate than S. yunnanensis while butterflies were only observed visiting S. yunnanensis, and no moths were observed visiting either. The proportion of flowers with moth eggs was highest for S. gracilicaulis, lower for S. chungtienensis and very low or zero for all other species. These finding suggest that differences in floral syndromes or reliance on self-pollination reduces interspecific reproductive interference and that attractiveness to moths and rates of moth oviposition are reduced for plants more reliant on self pollination.


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1 - University of South Carolina Upstate, NSE, 800 University Ave, Spartanburg, SC, 29306, USA
2 - Central China Normal University, School of Life Sciences, Wuhan, 430079, China
3 - US Forest Service, Apache-Sitgreaves National Forest, 30 S. Chricahua Dr., Springerville, AZ, 85938, USA

Keywords:
Pollination syndrome
pollen/ovule ratio
brood pollination
Silene.

Presentation Type: Oral Paper:Papers for Topics
Session: 13
Location: Salon 6/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 2:45 PM
Number: 13006
Abstract ID:1125
Candidate for Awards:None


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