RT journal article
T1 The holocentric chromosome microevolution: From phylogeographic patterns to genomic associations with environmental gradients
A1 Márquez-Corro, J.I.
A1 Martín-Bravo, S.
A1 Blanco Pastor, Jose Luis
A1 Luceño Garcés, Modesto
A1 Escudero, Marcial
A2 Biología
K1 Carex
K1 chromosomal speciation
K1 Cyperaceae
K1 hybrid dysfunction
K1 landscape genomics
K1 suppression recombination
AB Geographic isolation and chromosome evolution are two of the major drivers of diversification in eukaryotes in general, and specifically, in plants. On one hand, range shifts induced by Pleistocene glacial oscillations deeply shaped the evolutionary trajectories of species in the Northern Hemisphere. On the other hand, karyotype variability within species or species complexes may have adaptive potential as different karyotypes may represent different recombination rates and linkage groups that may be associated with locally adapted genes or supergenes. Organisms with holocentric chromosomes are ideal to study the link between local adaptation and chromosome evolution, due to their high cytogenetic variability, especially when it seems to be related to environmental variation. Here, we integrate the study of the phylogeography, chromosomal evolution and ecological requirements of a plant species complex distributed in the Western Euro-Mediterranean region (Carex gr. laevigata, Cyperaceae). We aim to clarify the relative influence of these factors on population differentiation and ultimately on speciation. We obtained a well-resolved RADseq phylogeny that sheds light on the phylogeographic patterns of molecular and chromosome number variation, which are compatible with south-to-north postglacial migration. In addition, landscape genomics analyses identified candidate loci for local adaptation, and also strong significant associations between the karyotype and the environment. We conclude that karyotype distribution in C. gr. laevigata has been constrained by both range shift dynamics and local adaptation. Our study demonstrates that chromosome evolution may be responsible, at least partially, for microevolutionary patterns of population differentiation and adaptation in Carex.
PB John Wiley & Sons Ltd.
SN 1365-294X
YR 2023
FD 2023
LK http://hdl.handle.net/10498/32126
UL http://hdl.handle.net/10498/32126
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 08-nov-2026