The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae)

Changes in chromosome number have played an important role in the diversification and evolution of angiosperms. In Asteraceae, tribe Vernonieae are one of the most variable groups with regard to chromosome number. Previously, chromosome numbers n = 9 and 10 were thought to characterize the Old World...

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Autores principales: Angulo, María Betiana, Chalup, Laura María Isabel, Florentín, Javier Elías, Dematteis, Massimiliano
Formato: Artículo
Lenguaje:Inglés
Publicado: Wiley Blackwell Publishing, Inc 2025
Acceso en línea:http://repositorio.unne.edu.ar/handle/123456789/59949
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RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE) de Universidad Nacional del Nordeste
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spelling I48-R184-123456789-599492025-12-15T14:30:40Z The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae) Angulo, María Betiana Chalup, Laura María Isabel Florentín, Javier Elías Dematteis, Massimiliano Changes in chromosome number have played an important role in the diversification and evolution of angiosperms. In Asteraceae, tribe Vernonieae are one of the most variable groups with regard to chromosome number. Previously, chromosome numbers n = 9 and 10 were thought to characterize the Old World members of the tribe, and n = 14, 16, 17 and 18 the New World members. This scenario was revised as a result of reports of new chromosome numbers, but the events leading to this wide variation remain unknown. Here we carried out a phylogenetic analysis of Vernonieae in a temporal framework, assessing patterns of diversification and establishing possible relationships with chromosome events. Chromosomal evolution was analysed with ChromEvol, from a phylogenetic tree dated in BEAST. Shifts in diversification rates using Bayesian analysis of macroevolutionary mixtures were inferred. Vernonieae originated ~46 Mya and the diversification rate increased sharply ~11 Mya after the Mid-Miocene Climatic Optimum. The ancestral chromosome number for the tribe was n = 10, which remained stable for Old World taxa, whereas n = 9 was the ancestral number for New World species. The tribe has undergone 32 chromosome rearrangements throughout its evolutionary history, with dysploidy and polyploidy possibly explaining the observed diversification pattern. 2025-12-15T14:21:31Z 2025-12-15T14:21:31Z 2022 Artículo Angulo, María Betiana, et al., 2022. The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae). Reino Unido: Wiley Blackwell Publishing, Inc, vol. 200, no. 4, p. 524-540. E-ISSN 1095-8339. 0024-4074 http://repositorio.unne.edu.ar/handle/123456789/59949 eng https://academic.oup.com/botlinnean/article/200/4/524/6660938 openAccess http://creativecommons.org/licenses/by-nc-nd/2.5/ar/ application/pdf p. 524-540 application/pdf Wiley Blackwell Publishing, Inc Botanical Journal of the Linnean Society, 2022, vol. 200, no. 4, p. 524-540.
institution Universidad Nacional del Nordeste
institution_str I-48
repository_str R-184
collection RIUNNE - Repositorio Institucional de la Universidad Nacional del Nordeste (UNNE)
language Inglés
description Changes in chromosome number have played an important role in the diversification and evolution of angiosperms. In Asteraceae, tribe Vernonieae are one of the most variable groups with regard to chromosome number. Previously, chromosome numbers n = 9 and 10 were thought to characterize the Old World members of the tribe, and n = 14, 16, 17 and 18 the New World members. This scenario was revised as a result of reports of new chromosome numbers, but the events leading to this wide variation remain unknown. Here we carried out a phylogenetic analysis of Vernonieae in a temporal framework, assessing patterns of diversification and establishing possible relationships with chromosome events. Chromosomal evolution was analysed with ChromEvol, from a phylogenetic tree dated in BEAST. Shifts in diversification rates using Bayesian analysis of macroevolutionary mixtures were inferred. Vernonieae originated ~46 Mya and the diversification rate increased sharply ~11 Mya after the Mid-Miocene Climatic Optimum. The ancestral chromosome number for the tribe was n = 10, which remained stable for Old World taxa, whereas n = 9 was the ancestral number for New World species. The tribe has undergone 32 chromosome rearrangements throughout its evolutionary history, with dysploidy and polyploidy possibly explaining the observed diversification pattern.
format Artículo
author Angulo, María Betiana
Chalup, Laura María Isabel
Florentín, Javier Elías
Dematteis, Massimiliano
spellingShingle Angulo, María Betiana
Chalup, Laura María Isabel
Florentín, Javier Elías
Dematteis, Massimiliano
The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae)
author_facet Angulo, María Betiana
Chalup, Laura María Isabel
Florentín, Javier Elías
Dematteis, Massimiliano
author_sort Angulo, María Betiana
title The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae)
title_short The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae)
title_full The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae)
title_fullStr The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae)
title_full_unstemmed The evolution of chromosome number during the diversification of the tribe Vernonieae (Asteraceae)
title_sort evolution of chromosome number during the diversification of the tribe vernonieae (asteraceae)
publisher Wiley Blackwell Publishing, Inc
publishDate 2025
url http://repositorio.unne.edu.ar/handle/123456789/59949
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