Lantana camara also uses lipids to make metallic blue fruit a second origin of lipid-based structural color


SOCIETY FOR INTEGRATIVE AND COMPARATIVE BIOLOGY
2021 VIRTUAL ANNUAL MEETING (VAM)
January 3 – Febuary 28, 2021

Meeting Abstract


9-8  Sat Jan 2  Lantana camara also uses lipids to make metallic blue fruit: a second origin of lipid-based structural color Sinnott-Armstrong, MA*; Smith, SD; Vignolini, S; University of Colorado-Boulder and University of Cambridge, UK; University of Colorado-Boulder; University of Cambridge msinnottarmstrong@gmail.com

The most distinctive colors in nature are produced not by pigments (such as anthocyanins or carotenoids) but rather by an alternative mechanism, structural color. Structural colors are extremely rare in plants, and only a handful of species have been described as having structural colors in their fruits. Two photonic structures have been described thus far from fruits and seeds: helicoidal cellulose nanofibers producing polarized light reflectance (known from two origins, in Pollia condensata and Margaritaria nobilis), and a recently described lipid-based disordered multilayer reflector in Viburnum tinus. Here, we report convergent evolution of this lipidic multilayer reflector in the fruits of a second species, the commonly planted and highly invasive shrub Lantana camara (the common lantana). Using transmission electron microscopy and serial EM tomography, we describe the developmental trajectory of this photonic structure during fruit maturation, and discuss how this lipid-based structure assembles over time from individual lipid droplets to forming a plate-like structure. We compare our findings in Lantana camara to the similar structure described in Viburnum tinus and discuss broader implications for fruit color evolution and the ecological consequences of distinctive fruit coloration.

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