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Strong phylogenetic effects on floral scent variation of oil-secreting orchids in South Africa

Title data

Steiner, Kim E. ; Kaiser, Roman ; Dötterl, Stefan:
Strong phylogenetic effects on floral scent variation of oil-secreting orchids in South Africa.
In: American Journal of Botany. Vol. 98 (2011) Issue 10 . - pp. 1663-1679.
ISSN 1537-2197
DOI: https://doi.org/10.3732/ajb.1100141

Abstract in another language

Premise of the study: Evolution involves the interplay between natural selection and phylogenetic constraint. This is particularly evident among the flowering plants where form and diversity of flowers attest to the importance of both pollinator-mediated selection and phylogenetic constraint. Although this has been studied mostly using visible floral characters, invisible volatile chemicals emitted by the flowers should be subject to these same evolutionary forces. Unfortunately, most analyses of floral volatiles have over-emphasized the importance of natural selection and underplayed phylogenetic constraint without quantifying their respective roles in the evolution and composition of floral scents.
Methods: We used multivariate analyses to test the relative importance of pollinators vs. phylogeny in determining the composition of floral scents among oil-secreting orchids in southern Africa. Floral scents of 42 oil-secreting taxa/ecotypes distributed among 12 subclades in the tribe Diseae were sampled using headspace adsorption and gas chromatography-massspectroscopy.
Key results: We identified 257 scent compounds distributed over nine different compound classes, with the majority of scents dominated by aliphatic or benzenoid compounds. The only significant predictor of floral scent among these orchids above the species level was phylogeny. Nevertheless, in two of the clades there were differences in scent profiles at the species and ecotypelevel that corresponded to different pollinators and were thus suggestive of pollinator-mediated selection.
Conclusions: Scent variation was greater than expected and phylogeny was more important than pollinator-mediated selection in predicting the composition of floral scents of oil-secreting orchids, despite the specialized nature of the pollinator rewardsystem.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER100122
Institutions of the University: Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Systematics
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 06 Jul 2015 10:25
Last Modified: 23 Nov 2015 18:05
URI: https://eref.uni-bayreuth.de/id/eprint/15858