RT Journal Article
T1 Macroevolutionary insights in sedges (Carex: Cyperaceae): The effects of rapid chromosome number evolution on lineage diversification
A1 Márquez Corro, José Ignacio
A1 Martín Bravo, Santiago
A1 Jiménez Mejías, Pedro
A1 Hipp, Andew L.
A1 Spalink, Daniel
A1 Naczi, Robert F. C.
A1 Roalson, Eric H.
A1 Luceño Garcés, Modesto
A1 Escuero, Marcial
K1 BAYOU
K1 Bioclimatic variables
K1 Brownian motion
K1 Diversification
K1 Morphological characters
K1 Ornstein-Uhlenbeck model
K1 Phylogenetic Comparative Methods
K1 QuaSSE
K1 SLOUCH
AB Changes in holocentric chromosome number due to fission and fusion have direct and immediate effects on genome structure and recombination rates. These, in turn, may influence ecology and evolutionary trajectories profoundly. Sedges of the genus Carex (Cyperaceae) comprise ca. 2000 species with holocentric chromosomes. The genus exhibits a phenomenal range in the chromosome number (2n = 10 − 132) with almost not polyploidy. In this study, we integrated the most comprehensive cytogenetic and phylogenetic data for sedges with associated climatic and morphological data to investigate the hypothesis that high recombination rates are selected when evolutionary innovation is required, using chromosome number evolution as a proxy for recombination rate. We evaluated Ornstein–Uhlenbeck models to infer shifts in chromosome number equilibrium and selective regime. We also tested the relationship between chromosome number and diversification rates. Our analyses demonstrate significant correlations between morphology and climatic niche and chromosome number in Carex. Nevertheless, the amount of chromosomal variation that we are able to explain is very small. We recognized a large number of shifts in mean chromosome number, but a significantly lower number in climatic niche and morphology. We also detected a peak in diversification rates near intermediate recombination rates. In combination, these analyses point toward the importance of chromosome evolution to the evolutionary history of Carex. Our work suggests that the effect of chromosome evolution on recombination rates, not just on reproductive isolation, may be central to the evolutionary history of sedges.
PB Wiley
YR 2021
FD 2021
LK https://hdl.handle.net/10433/26321
UL https://hdl.handle.net/10433/26321
LA en
NO Journal of Systematic and Evolution, vol 59, nº 4, p. 776-790
NO Universidad Pablo de Olavide. Departamento de Biología Molecular e Ingeniería Bioquímica
DS RIO
RD May 22, 2026