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dc.contributor.author
Las Peñas, Maria Laura
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dc.contributor.author
Bernardello, Gabriel Luis Mario
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dc.date.available
2021-08-02T20:32:54Z
dc.date.issued
2021-06
dc.identifier.citation
Las Peñas, Maria Laura; Bernardello, Gabriel Luis Mario; Divergence time estimation and mapping of morphological and cytogenetical data in the southern South American geophyte genus Pterocactus (Cactaceae); International Association for Plant Taxonomy; Taxon; 70; 3; 6-2021; 552-569
dc.identifier.issn
0040-0262
dc.identifier.uri
http://hdl.handle.net/11336/137619
dc.description.abstract
Pterocactus has 10 species endemic to restricted areas of the Argentine Monte and Patagonia regions, also growing in neighbouring Chile. We analysed phylogenetic relationships between its species, based on plastid DNA sequences (psbA-trnH, rpl16, trnH-matK), exomorphological features (spine type and size, stem segment form, flower position, epidermis colour, areole pubescence, stem surface) and cytogenetical traits (genome size, somatic chromosome number). Traits were mapped using character mapping and ancestral state reconstruction to understand the dynamics of evolutionary changes. Pterocactus was monophyletic. Two lineages were recovered: clade A (with P. fischeri diverging early and P. reticulatus, P. valentinii, P. megliolii, P. gonjianii, and both P. tuberosus forms) and clade B (with P. neuquensis diverging first and P. araucanus and P. hickenii). Both samples examined of P. australis were paraphyletic. It was estimated that Pterocactus split from its sister group at 9.38 mya. The crown group age was estimated to be 7.69 myr. Species showed x = 11 with different ploidy levels (2n = 22, 44, 99, ca. 110, and 154); only P. tuberosus f. tuberosus was diploid. The numbers were typical of each taxon studied, and polyploidy was important in its diversification. Two 18S-5.8S-26S sites were detected regardless of the ploidy level, except P. fischeri with four sites and 2n = ca. 110. The number of 5S sites was 2 in P. gonjianii and the diploid P. tuberosus f. tuberosus, 4 in the tetraploid P. tuberosus f. lelongii, 10 in the probably decaploid P. fischeri and 8 in P. araucanus of unknown chromosome number. The genome size ranged from 2C = 4.94 pg in P. megliolii of unknown chromosome number to 2C = 16.68 pg in the tetradecaploid P. hickenii. The ancestor is reconstructed as a dwarf shrub with cylindrical central spines of 16.35–31.2 mm long, non-woolly areoles, cylindrical to globose/obpyriform stem segments, non-tuberculate stem surface, lateral flower position, green/brown to violet epidermis, probably diploid, and with a genome size between 1.10 and 1.23 pg.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
International Association for Plant Taxonomy
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dc.rights
info:eu-repo/semantics/restrictedAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
ANCESTRAL STATE RECONSTRUCTION
dc.subject
CYTOGENETICS
dc.subject
DNA CONTENT
dc.subject
MORPHOLOGY
dc.subject
PHYLOGENY
dc.subject
POLYPLOIDY
dc.subject
PTEROCACTUS
dc.subject
RDNA
dc.subject.classification
Ciencias de las Plantas, Botánica
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dc.subject.classification
Ciencias Biológicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
Divergence time estimation and mapping of morphological and cytogenetical data in the southern South American geophyte genus Pterocactus (Cactaceae)
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2021-07-30T18:03:35Z
dc.journal.volume
70
dc.journal.number
3
dc.journal.pagination
552-569
dc.journal.pais
Austria
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dc.journal.ciudad
Viena
dc.description.fil
Fil: Las Peñas, Maria Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
dc.description.fil
Fil: Bernardello, Gabriel Luis Mario. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto Multidisciplinario de Biología Vegetal. Universidad Nacional de Córdoba. Facultad de Ciencias Exactas Físicas y Naturales. Instituto Multidisciplinario de Biología Vegetal; Argentina
dc.journal.title
Taxon
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/https://doi.org/10.1002/tax.12497
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://onlinelibrary.wiley.com/doi/abs/10.1002/tax.12497
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