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A novel cost framework reveals evidence for competitive selection in the evolution of complex traits during plant domestication

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Allaby, Robin G., Stevens, Chris J. and Fuller, Dorian Q. (2022) A novel cost framework reveals evidence for competitive selection in the evolution of complex traits during plant domestication. Journal of Theoretical Biology, 537 . 111004. doi:10.1016/j.jtbi.2022.111004

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Official URL: https://doi.org/10.1016/j.jtbi.2022.111004

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Abstract

Most models of selection incorporate some notion of environmental degradation where the majority of the population becomes less fit with respect to a character resulting in pressure to adapt. Such models have been variously associated with an adaptation cost, the substitution load. Conversely, adaptative mutations that represent an improvement in fitness in the absence of environmental change have generally been assumed to be associated with negligible cost. However, such adaptations could represent a competitive advantage that diminishes resource availability for others and so induces a cost. This type of adaptation in the form of seedling competition has been suggested as a mechanism for increases in seed size during domestication, a trait associated with the standard stabilizing selection model. We present a novel cost framework for competitive selection that demonstrates significant differences in behaviour to environmental based selection in intensity, intensity over time and directly contrasts to the expectations of the standard model. Grain metrics of nine archaeological crops fit a mixed model in which episodes of competitive selection often emerge from shifting optimum episodes of stabilizing selection, highlighting the potential prevalence of the mechanism outlined here and providing a fundamental insight into the factors driving domestication.

Item Type: Journal Article
Subjects: Q Science > QH Natural history
Q Science > QK Botany
S Agriculture > SB Plant culture
Divisions: Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- )
Library of Congress Subject Headings (LCSH): Plants, Cultivated, Plants, Cultivated -- Genetic aspects, Domestication -- Genetic aspects, Natural selection, Seeds -- Size
Journal or Publication Title: Journal of Theoretical Biology
Publisher: Elsevier
ISSN: 0022-5193
Book Title: A novel cost framework reveals evidence for competitive selection in the evolution of complex traits during plant domestication
Official Date: 21 March 2022
Dates:
DateEvent
21 March 2022Published
12 January 2022Available
3 January 2022Accepted
Volume: 537
Article Number: 111004
DOI: 10.1016/j.jtbi.2022.111004
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
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