How to colour a flower: on the optical principles of flower coloration.

Détails

ID Serval
serval:BIB_1951932C839F
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
How to colour a flower: on the optical principles of flower coloration.
Périodique
Proceedings. Biological sciences
Auteur(s)
van der Kooi C.J., Elzenga J.T., Staal M., Stavenga D.G.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Statut éditorial
Publié
Date de publication
11/05/2016
Peer-reviewed
Oui
Volume
283
Numéro
1830
Pages
20160429
Langue
anglais
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Résumé
The coloration of flowers is due to the wavelength-selective absorption by pigments of light backscattered by structures inside the petals. We investigated the optical properties of flowers using (micro)spectrophotometry and anatomical methods. To assess the contribution of different structures to the overall visual signal of flowers, we used an optical model, where a petal is considered as a stack of differently pigmented and structured layers and we interpreted the visual signals of the model petals with insect vision models. We show that the reflectance depends, in addition to the pigmentation, on the petal's thickness and the inhomogeneity of its interior. We find large between-species differences in floral pigments, pigment concentration and localization, as well as floral interior structure. The fractions of reflected and transmitted light are remarkably similar between the studied species, suggesting common selective pressures of pollinator visual systems. Our optical model highlights that pigment localization crucially determines the efficiency of pigmentary filtering and thereby the chromatic contrast and saturation of the visual signal. The strongest visual signal occurs with deposition of pigments only on the side of viewing. Our systematic approach and optical modelling open new perspectives on the virtues of flower colour.

Mots-clé
Animals, Bees, Flowers/anatomy & histology, Flowers/chemistry, Models, Biological, Photoreceptor Cells, Invertebrate/chemistry, Pigmentation, Pigments, Biological/chemistry, Pollination, Spectrophotometry, absorbance, anatomy, pigment, pollination, reflectance, vision model
Pubmed
Web of science
Open Access
Oui
Création de la notice
11/04/2016 14:27
Dernière modification de la notice
20/08/2019 12:50
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