Floral Scents of a Deceptive Plant Are Hyperdiverse and Under Population-Specific Phenotypic Selection
Résumé
Floral scent is a key mediator in plant-pollinator interactions; however, little is known to what extent intraspecific scent variation is shaped by phenotypic selection, with no information yet in deceptive plants. We collected inflorescence scent and fruit set of the deceptive fly-pollinated Arum maculatum from various populations north vs. south of the Alps. We recorded 291 scent compounds and found that scent and fruit set differed north vs. south of the Alps. Seven and two compounds were under phenotypic selelection in the largest northern and southern population respectively, among them none of the four presently known pollinator attractants of A. maculatum. Our study provides the highest number of scent compounds so far reported in a single plant species and provides evidence for the first time that floral scents of a deceptive species are under phenotypic selection. It suggests that regional differences in scent are only partly due to divergent selection.
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