Article
Drivers of diversification in Linum (Linaceae) by means of chromosome evolution: correlations with biogeography, breeding system and habit.
Author/s | Valdés Florido, Ana
Tan, Lu Maguilla Salado, Enrique Simón Porcar, Violeta Zhou, Yong-Hong Arroyo Marín, Juan Escudero Lirio, Marcial |
Department | Universidad de Sevilla. Departamento de Biología Vegetal y Ecología |
Publication Date | 2023-09-10 |
Deposit Date | 2024-02-19 |
Published in |
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Abstract | Background and Aims
Chromosome evolution leads to hybrid dysfunction and recombination patterns and has thus been proposed as a major driver of diversification in all branches of the tree of life, including flowering ... Background and Aims Chromosome evolution leads to hybrid dysfunction and recombination patterns and has thus been proposed as a major driver of diversification in all branches of the tree of life, including flowering plants. In this study we used the genus Linum (flax species) to evaluate the effects of chromosomal evolution on diversification rates and on traits that are important for sexual reproduction. Linum is a useful study group because it has considerable reproductive polymorphism (heterostyly) and chromosomal variation (n = 6–36) and a complex pattern of biogeographical distribution. Methods We tested several traditional hypotheses of chromosomal evolution. We analysed changes in chromosome number across the phylogenetic tree (ChromEvol model) in combination with diversification rates (ChromoSSE model), biogeographical distribution, heterostyly and habit (ChromePlus model). Key Results Chromosome number evolved across the Linum phylogeny from an estimated ancestral chromosome number of n = 9. While there were few apparent incidences of cladogenesis through chromosome evolution, we inferred up to five chromosomal speciation events. Chromosome evolution was not related to heterostyly but did show significant relationships with habit and geographical range. Polyploidy was negatively correlated with perennial habit, as expected from the relative commonness of perennial woodiness and absence of perennial clonality in the genus. The colonization of new areas was linked to genome rearrangements (polyploidy and dysploidy), which could be associated with speciation events during the colonization process. Conclusions Chromosome evolution is a key trait in some clades of the Linum phylogeny. Chromosome evolution directly impacts speciation and indirectly influences biogeographical processes and important plant traits. |
Funding agencies | Ministerio de Ciencia e Innovación (MICIN). España European Union (UE). H2020 |
Project ID. | PGC2018-099608-B-I00
PID2021-122715NB-I00 PRE2019-087452 H2020 897890 FLAXMaTE |
Citation | Valdés Florido, A., Tan, L., Maguilla Salado, E., Simón Porcar, V., Zhou, Y., Arroyo Marín, J. y Escudero Lirio, M. (2023). Drivers of diversification in Linum (Linaceae) by means of chromosome evolution: correlations with biogeography, breeding system and habit.. Annals of Botany, 132 (5), 949-962. https://doi.org/10.1093/aob/mcad139. |
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