Disordered wax platelets on Tradescantia pallida leaves create golden shine
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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.
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1364-5498
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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)