Abstract Detail

Evolutionary Developmental Biology (Evo-Devo)

Sinnott-Armstrong, Miranda [1], Middleton, Rox [2], Ogawa, Yu [3], Moyroud, Edwige [4], Prum, Richard [5], Glover, Beverley [6], Rudall, Paula [7], Vignolini, Silvia [8], Donoghue, Michael [9].

Structural color, cell walls, and the evolution of Viburnum fruits.

The biological significance of structural color is poorly understood in plants relative to animals. Here, we examine how structural color in Viburnum fruits has evolved across the group, and how structural coloration forms part of a syndrome of traits related to Viburnum fruit nutrition and morphology.  Previously, Viburnum tinus was found to use a lipid-based optical reflector to generate the metallic blue color of its fruits.  We used transmission electron microscopy (TEM) to examine fruit tissue from fresh and herbarium fruit material from 27 Viburnum species in order to describe the evolution of cell wall architecture across the clade.  From TEM images, we characterized cell wall architecture in each species, including the presence or absence of lipid-based structures that could generate structural coloration in fruits.  We identify two mechanisms to produce the blue appearance of Viburnum fruits, one previously described in the Tinus clade and one newly identified in the distantly related Dentata clade. In both cases, we observed significant quantities of lipid droplets embedded in their cell walls, arranged in different configurations.  We observe a strong correlation between fruit color and fruit nutritional value and morphology, specifically that blue fruit color is associated with increased nutritional lipid content and reduced pulp. The correlations we have found in Viburnum may exist in other plant clades.

1 - University of Colorado-Boulder, Ecology and Evolutionary Biology, 1900 Pleasant St., Ramaley Bldg N122, Boulder, Colorado, 80309-0001, US
2 - University of Bristol, Biology, Beacon House, Queens Road, Bristol, BS8 1QU, UK
3 - University of Grenoble Alps, CNRS, Cermav, Grenoble, France
4 - University of Cambridge, Sainsbury Laboratory, Bateman Street, Cambridge, CB2 ILR, UK
5 - Yale University, Ecology and Evolutionary Biology, 21 Sachem St, New Haven, CT, 06511, USA
6 - University Of Cambridge, Department Of Plant Sciences, Downing Street, Cambridge, CB22 7RS, United Kingdom
7 - Royal Botanic Gardens, Kew, Richmond, TW9 3DS, United Kingdom
8 - University of Cambridge, Chemistry, Lensfield Road, Cambridge, CB2 1EW, UK
9 - Yale University, Department Of Ecology And Evolutionary Biology, 21 Sachem Street, Po Box 208106, New Haven, CT, 06511, United States

fruit color
seed dispersal
structural color

Presentation Type: Oral Paper
Session: EVDV1, Evolutionary Developmental Biology (Evo-Devo)
Location: Virtual/Virtual
Date: Thursday, July 30th, 2020
Time: 10:15 AM
Number: EVDV1002
Abstract ID:683
Candidate for Awards:None

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