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Disordered wax platelets on Tradescantia pallida leaves create golden shine

Accepted version
Peer-reviewed

Type

Article

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Authors

van de Kerkhof, Gerda Theodora 
Poon, Rebecca 

Abstract

Plants have various strategies to protect themselves from harmful light. An example of such aprotective mechanism is the growth of epicuticular nanostructures, such as a layer of hair or waxcrystals. Most nanostructures are optimised to screen UV radiation, as UV light is particularlydamaging for cellular tissue. We find that, contrary to the commonly found UV reflectance, theepicuticular wax crystals onTradescantialeaves reflect strongly in the higher visible wavelengthregime. Thus, they give the leaves a golden shine. We characterize the optical appearance ofTradescantia pallida‘purpurea’ leaves by angularly resolved spectroscopy and compare the resultsto finite difference time domain simulations. We find that it is the disordered assembly of the waxplatelets that is the crucial parameter to obtain the observed reflected intensity increase for higherwavelengths.

Description

Keywords

Nanostructures, Plant Leaves, Refractometry, Spectrum Analysis, Tradescantia, Ultraviolet Rays

Journal Title

Faraday Discussions

Conference Name

Journal ISSN

1359-6640
1364-5498

Volume Title

Publisher

RSC

Rights

All rights reserved
Sponsorship
Leverhulme Trust (F/09 741/G)
European Research Council (639088)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (702911)
European Commission Horizon 2020 (H2020) Marie Sk?odowska-Curie actions (722842)
Biotechnology and Biological Sciences Research Council (BB/K014617/1)
This work was funded by by EU’s Horizon 2020 research and in-novation programme under the Marie Skłodowska-Curie grantagreement No. 722842 (ITN Plant-inspired Materials and Sur-faces–PlaMatSu), the Swiss National Science Foundation underproject P2ZHP2_183998 and BBSRC David Phillips Fellowship(BB/K014617/1) and the European Research Council (ERC-2014-STG H2020 639088)