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Self-assembled, disordered structural color from fruit wax bloom
Rox Middleton1,2, Sverre Aarseth Tunstad1, Andre Knapp3
1University of Bristol, Bristol, UK.
Science Advances
|February 7, 2024
Summary
Blue fruits often appear colored due to structural mechanisms, not pigments. This study reveals how epicuticular waxes create blue structural color, offering insights for bioengineering applications.
Area of Science:
- Plant biology
- Biophysics
- Materials science
Background:
- Visually guided frugivores possess blue-sensitive vision, yet blue fruits are uncommon.
- Some blue fruits lack blue pigments, suggesting alternative coloration mechanisms.
Purpose of the Study:
- To investigate the mechanism behind the blue appearance of fruits like blueberries and plums.
- To explore the role of structural color in fruit appearance and its implications for bioengineering.
Main Methods:
- Analysis of dark pigmented fruits with wax blooms (e.g., blueberries, plums).
- Investigating the interaction of randomly arranged nonspherical scatterers with light.
- Laboratory reproduction of structural color by recrystallizing and self-assembling wax bloom.
Main Results:
- Structural color, not pigment, is responsible for the blue appearance in studied fruits.
- Blue-ultraviolet reflectance originates from light interaction with randomly arranged, nonspherical scatterers in wax blooms.
- Structural color was successfully reproduced in the lab through wax bloom self-assembly.
Conclusions:
- Fruit blue coloration is not limited to blue pigment or subcuticular structures.
- Convergent optical properties exist across diverse fruit morphologies and phylogenetic ranges.
- Epicuticular waxes represent a promising biomaterial for sustainable, self-assembling optical applications in bioengineering.
