Functional optics of glossy buttercup flowers.

Détails

ID Serval
serval:BIB_7C25F3D522AA
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Functional optics of glossy buttercup flowers.
Périodique
Journal of the Royal Society, Interface
Auteur(s)
van der Kooi C.J., Elzenga J.T., Dijksterhuis J., Stavenga D.G.
ISSN
1742-5662 (Electronic)
ISSN-L
1742-5662
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
14
Numéro
127
Pages
0
Langue
anglais
Résumé
Buttercup (Ranunculus spp.) flowers are exceptional because they feature a distinct gloss (mirror-like reflection) in addition to their matte-yellow coloration. We investigated the optical properties of yellow petals of several Ranunculus and related species using (micro)spectrophotometry and anatomical methods. The contribution of different petal structures to the overall visual signal was quantified using a recently developed optical model. We show that the coloration of glossy buttercup flowers is due to a rare combination of structural and pigmentary coloration. A very flat, pigment-filled upper epidermis acts as a thin-film reflector yielding the gloss, and additionally serves as a filter for light backscattered by the strongly scattering starch and mesophyll layers, which yields the matte-yellow colour. We discuss the evolution of the gloss and its two likely functions: it provides a strong visual signal to insect pollinators and increases the reflection of sunlight to the centre of the flower in order to heat the reproductive organs.

Mots-clé
flower colour, epidermis, structural coloration, thin-film interference, pigment, starch
Pubmed
Web of science
Création de la notice
07/03/2017 21:44
Dernière modification de la notice
03/03/2018 18:37
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