Botany: Floral fluorescence effect

@article{GandaHerrero2005BotanyFF,
  title={Botany: Floral fluorescence effect},
  author={Fernando Gand{\'i}a-Herrero and Francisco Garc{\'i}a-Carmona and Josefa Escribano},
  journal={Nature},
  year={2005},
  volume={437},
  pages={334-334}
}
The way flowers appear to insects is crucial for pollination. Here we describe an internal light-filtering effect in the flowers of Mirabilis jalapa, in which the visible fluorescence emitted by one pigment, a yellow betaxanthin, is absorbed by another, a violet betacyanin, to create a contrasting fluorescent pattern on the flower's petals. This finding opens up new possibilities for pollinator perception as fluorescence has not previously been considered as a potential signal in flowers. 
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