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Artículo

Data reassessment in a phylogenetic context gives insight into chromosome evolution in the giant genus Solanum (Solanaceae)

Chiarini, Franco EzequielIcon ; Sazatornil, Federico DavidIcon ; Bernardello, Gabriel Luis MarioIcon
Fecha de publicación: 05/2018
Editorial: Cambridge University Press
Revista: Systematics And Biodiversity
ISSN: 1477-2000
e-ISSN: 1478-0933
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Biología

Resumen

Chromosome data are fundamental in evolution. However, there has been no attempt to synthesize and evaluate the significance of such information from a phylogenetic perspective in the giant genus Solanum, which was the aim of this work. New and published information of the main cytotaxonomic features (chromosome number, polyploidy, total length of the haploid complement, mean chromosome length, mean arm ratio, karyotype formula, nuclear DNA amount, number/position of rDNA sites) was compiled and mapped onto an embracing Solanaceae phylogeny, performing Ancestral States Reconstruction. There were 506 Solanum species with chromosome counts (49.7% from an estimated total of 1,018 spp.), with x = 12 being the most frequent number (97%). Species with karyotypes represent 18.8%, while 8% have been studied with any molecular cytogenetic technique. Chromosome characters showed transitions associated with supported nodes, some of which have undergone fewer transitions than others. The common ancestor of all Solanum was a diploid with 2n = 24, a karyotype with st and/or t chromosomes, 2C DNA content of 1–1.2 pg, one locus of 18–5.8–26S rDNA and one of 5S, both loci being asyntenic. The chromosomal variables behave as homoplastic, with reversions in all branches. The analysed characters were sorted from more to less conserved: asynteny of rDNA loci; number of sites of 18–5.8–26S; chromosome number; karyotype formula; number of 5S loci. This pattern of chromosomal evolution distinguishes Solanum from closely related genera and from genera from other families with a similar number of species.
Palabras clave: ANCESTRAL STATE RECONSTRUCTION , CHROMOSOME EVOLUTION , CHROMOSOME NUMBER , DNA CONTENT , KARYOTYPE , RDNA LOCI , SOLANUM , SYNTENY
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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
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URI: http://hdl.handle.net/11336/86557
URL: https://www.tandfonline.com/doi/full/10.1080/14772000.2018.1431320
DOI: https://doi.org/10.1080/14772000.2018.1431320
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Articulos(IMBIV)
Articulos de INST.MULTIDISCIPL.DE BIOLOGIA VEGETAL (P)
Citación
Chiarini, Franco Ezequiel; Sazatornil, Federico David; Bernardello, Gabriel Luis Mario; Data reassessment in a phylogenetic context gives insight into chromosome evolution in the giant genus Solanum (Solanaceae); Cambridge University Press; Systematics And Biodiversity; 16; 4; 5-2018; 397-416
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