Potential adaptive divergence between subspecies and populations of snapdragon plants inferred from QST – FST comparisons
Creators
- 1. PSL Université Paris: EPHE-UPVD-CNRS, USR 3278 CRIOBE, Université de Perpignan, 52 Avenue Paul Alduy, 66860, 66360 Perpignan Cedex, France.
- 2. BIOGECO, INRA, University of Bordeaux, Pessac, France
- 3. Institut des Sciences de l'Évolution (ISEM), équipe "Dynamique de la biodiversité, anthropo-écologie", UMR 5554, Université de Montpellier, CNRS, IRD, EPHE, Place Eugène Bataillon, Cc 065, 34095 Montpellier cedex 05, France
- 4. Laboratoire Évolution & Diversité Biologique (EDB UMR 5174), Université Fédérale de Toulouse Midi-Pyrénées, CNRS, IRD, UPS, Toulouse, France
Description
Phenotypic divergence among natural populations can be explained by natural selection or by neutral processes such as drift. Many examples in the literature compare putatively neutral (FST) and quantitative genetic (QST) differentiation in multiple populations to assess their evolutionary signature and identify candidate traits involved with local adaptation. Investigating these signatures in closely related or recently diversified species has the potential to shed light on the divergence processes acting at the interspecific level. Here, we conducted this comparison in two subspecies of snapdragon plants (eight populations of Antirrhinum majus pseudomajus and five populations of A. m. striatum) in a common garden experiment. We also tested whether altitude was involved with population phenotypic divergence. Our results identified candidate phenological and morphological traits involved with local adaptation. Most of these traits were identified in one subspecies but not the other. Phenotypic divergence increased with altitude for a few biomass-related traits, but only in A. m. striatum. These traits therefore potentially reflect A. m. striatum adaptation to altitude. Our findings imply that adaptive processes potentially differ at the scale of A. majus subspecies.
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- Report: 10.24072/pci.evolbiol.100097 (DOI)