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Sci Rep

Title:		"Reproductive resource partitioning in two sympatric Goniothalamus species (Annonaceae) from Borneo: floral biology, pollinator trapping and plant breeding system"
Author(s):		Lau JY; Pang CC; Ramsden L; Saunders RM;
Address:		"School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, China"
Journal Title:		Sci Rep
Year:		2016
Volume:		20161021
Issue:
Page Number:		35674 -
DOI:		10.1038/srep35674
ISSN/ISBN:		2045-2322 (Electronic) 2045-2322 (Linking)
Abstract:		"The floral phenology, pollination ecology and breeding systems of two sympatric early-divergent angiosperms, Goniothalamus tapisoides and G. suaveolens (Annonaceae) are compared. The flowers are protogynous and morphologically similar, with anthesis over 23-25 h. Both species are predominantly xenogamous and pollinated by small beetles: G. tapisoides mainly by Curculionidae and G. suaveolens mainly by Nitidulidae. Coevolution and reproductive resource partitioning, reducing interspecific pollen transfer, is achieved by temporal isolation, due to contrasting floral phenologies; and ethological isolation, due to contrasting floral scents that contain attractants specific to the two beetle families. Analysis of floral scents revealed three volatiles (3-methylbutyl acetate, ethyl hexanoate and 2-phenylethanol) that are known to be nitidulid attractants in the floral scent of G. suaveolens, but absent from that of G. tapisoides. An effective pollinator trapping mechanism is demonstrated for both species, representing the first such report for the family. Trapping is achieved by the compression of the outer petals against the apertures between the inner petals. This trapping mechanism is likely to be a key evolutionary innovation for Goniothalamus, increasing pollination efficiency by increasing pollen loading on beetles during the staminate phase, promoting effective interfloral pollinator movements, and increasing seed-set by enabling rapid turn-over of flowers"
Keywords:		"Animals Borneo Coleoptera/physiology DNA, Plant/genetics Ecosystem Flowers/anatomy & histology/growth & development Genetic Speciation Goniothalamus/anatomy & histology/genetics/*physiology Microsatellite Repeats Odorants Plant Breeding Pollination/physio;"
Notes:		"MedlineLau, Jenny Y Y Pang, Chun-Chiu Ramsden, Lawrence Saunders, Richard M K eng Research Support, Non-U.S. Gov't England 2016/10/22 Sci Rep. 2016 Oct 21; 6:35674. doi: 10.1038/srep35674"