Spatiotemporal floral scent variation of Penstemon digitalis
2015 (English)In: Journal of Chemical Ecology, ISSN 0098-0331, E-ISSN 1573-1561, Vol. 41, no 7, 641-650 p.Article in journal (Refereed) Published
Variability in floral volatile emissions can occur temporally through floral development, during diel cycles, as well as spatially within a flower. These spatiotemporal patterns are hypothesized to provide additional information to floral visitors, but they are rarely measured, and their attendant hypotheses are even more rarely tested. In Penstemon digitalis, a plant whose floral scent has been shown to be under strong phenotypic selection for seed fitness, we investigated spatiotemporal variation in floral scent by using dynamic headspace collection, respectively solid-phase microextraction, and analyzed the volatile samples by combined gas chromatography-mass spectrometry. Total volatile emission was greatest during flowering and peak pollinator activity hours, suggesting its importance in mediating ecological interactions. We also detected tissue and reward-specific compounds, consistent with the hypothesis that complexity in floral scent composition reflects several ecological functions. In particular, we found tissue-specific scents for the stigma, stamens, and staminode (a modified sterile stamen common to all Penstemons). Our findings emphasize the dynamic nature of floral scents and highlight a need for greater understanding of ecological and physiological mechanisms driving spatiotemporal patterns in scent production.
Place, publisher, year, edition, pages
2015. Vol. 41, no 7, 641-650 p.
Diel variation, Floral scent, Nectar scent, GC/MS, S-(+)-linalool, Pollen odor, Staminode
IdentifiersURN: urn:nbn:se:uu:diva-264677DOI: 10.1007/s10886-015-0599-1ISI: 000361465800006PubMedID: 26133675OAI: oai:DiVA.org:uu-264677DiVA: diva2:861286
FunderThe Royal Swedish Academy of Sciences