Artículo
Macroevolutionary insights into sedges (Carex: Cyperaceae): The effects of rapid chromosome number evolution on lineage diversification
Autor/es | Márquez Corro, José Ignacio
Martín Bravo, Santiago Jiménez Mejías, Pedro Hipp, Andrew L. Spalink, Daniel Naczi, Robert F.C. Roalson, Eric H. Luceño, Modesto Escudero Lirio, Marcial |
Departamento | Universidad de Sevilla. Departamento de Biología Vegetal y Ecología |
Fecha de publicación | 2021-07 |
Fecha de depósito | 2024-01-26 |
Publicado en |
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Resumen | 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. ... 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. |
Agencias financiadoras | Ministerio de Economía y Competitividad (MINECO). España |
Identificador del proyecto | CGL2016-77401-P
PGC2018-099608-B-I00 |
Cita | Márquez Corro, J.I., Martín Bravo, S., Jiménez Mejías, P., Hipp, A.L., Spalink, D., Naczi, R.F.C.,...,Escudero Lirio, M. (2021). Macroevolutionary insights into sedges (Carex: Cyperaceae): The effects of rapid chromosome number evolution on lineage diversification. Journal of Systematics and Evolution, 59 (4), 776-790. https://doi.org/10.1111/jse.12730. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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10.1111_jse.12730.pdf | 1.685Mb | [PDF] | Ver/ | Versión Aceptada |
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