Genome size variation and incidence of polyploidy in Scrophulariaceae sensu lato from the Iberian Peninsula

Castro, Mariana; Castro, Sílvia; Loureiro, João

doi:10.1093/aobpla/pls037

Cited by 19 publications

(31 citation statements)

References 36 publications

(27 reference statements)

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“…150 species, ‘because it is felt that genome size evolution in such a large subgroup would be a project of its own’ (Albach & Greilhuber, ). Furthermore, sampling in that study was not sufficiently dense to provide the monoploid genome size, the size of a single chromosome set (1Cx‐value; Greilhuber et al ., ), for ploidy level analyses in all polyploid complexes of the genus, and this has resulted in at least one case in which ploidy in the genus based on flow cytometry (Castro, Castro & Loureiro, ) has been misinterpreted.…”

Section: Introductionmentioning

confidence: 99%

Is genome downsizing associated with diversification in polyploid lineages ofVeronica?

et al. 2015

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The study of genome size evolution in a phylogenetic context in related polyploid and diploid lineages can help us to understand the advantages and disadvantages of genome size changes and their effect on diversification. Here, we contribute 199 new DNA sequences and a nearly threefold increase in genome size estimates in polyploid and diploid Veronica (Plantaginaceae) (to 128 species, c. 30% of the genus) to provide a comprehensive baseline to explore the effect of genome size changes. We reconstructed internal transcribed spacer (ITS) and trnL‐trnL‐trnF phylogenetic trees and performed phylogenetic generalized least squares (PGLS), ancestral character state reconstruction, molecular dating and diversification analyses. Veronica 1C‐values range from 0.26 to 3.19 pg. Life history is significantly correlated with 1C‐value, whereas ploidy and chromosome number are strongly correlated with both 1C‐ and 1Cx‐values. The estimated ancestral Veronica 1Cx‐value is 0.65 pg, with significant genome downsizing in the polyploid Southern Hemisphere subgenus Pseudoveronica and two Northern Hemisphere subgenera, and significant genome upsizing in two diploid subgenera. These genomic downsizing events are accompanied by increased diversification rates, but a ‘core shift’ was only detected in the rate of subgenus Pseudoveronica. Polyploidy is important in the evolution of the genus, and a link between genome downsizing and polyploid diversification and species radiations is hypothesized. © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 178, 243–266.

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Section: Introductionmentioning

confidence: 99%

Is genome downsizing associated with diversification in polyploid lineages ofVeronica?

et al. 2015

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“…Reichenbach, 1828, Cymbalaria Hill, 1756, Chelone Linnaeus, 1753, Digitalis Linnaeus, 1753, Linaria Miller, 1754, Plantago , Nuttallanthus D.A. Sutton, 1988, Stemodia Linnaeus, 1759, Veronica (Hair 1966, Subramanian and Pondmudi 1987, Sosa and Seijo 2002, Sosa et al 2009, 2011, Wolfe et al 2002, Vargas et al 2004, Murray et al 2010, Castro et al 2012, Wong and Murray 2012, Ranjbar and Nouri 2015). Our results evidenced the presence of multiple cytotypes in Mecardonia , hence suggesting polyploidy as a key driver of the evolution of the genus.…”

Section: Discussionmentioning

confidence: 99%

“…These studies focused on the use of genome size as a taxonomic marker (Castro et al 2012, Angulo and Dematteis 2013, Galdeano et al 2016) and on finding correlations between ecological and environmental variables and this character (Chalup et al 2014, Vega and Dematteis 2015). However, there are still many families and genera being neglected, including Mecardonia , for which the present study is the first analysis of genome size for the genus.…”

Section: Discussionmentioning

confidence: 99%

“…It has been well documented in many plants that chromosome numbers and genome size can be used as extra taxonomic characters for discriminating between closely related taxa, helping to clarify the taxonomy of some species in problematic genus (Guerra 2008, Castro et al 2012, Sosa and Dematteis 2014). For example, Mercardonia sp.…”

Section: Taxonomic Implicationsmentioning

confidence: 99%

“…Characters such as chromosome number, morphology, and meiotic behavior, as well as nuclear DNA content, have been used as taxonomic markers helping to circumscribe taxa and infer their relationships (Kron et al 2007, Guerra 2008, Loureiro et al 2010, Castro et al 2012). At present, only two species of Mecardonia have been evaluated cytologically.…”

Section: Introductionmentioning

confidence: 99%

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Chromosome numbers and DNA content in some species of Mecardonia (Gratiolae, Plantaginaceae)

Sosa¹,

Angulo²,

Greppi³

et al. 2016

CCG

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Cytogenetic characterization and determination of DNA content by flow cytometry of five species of Mecardonia Ruiz et Pavon, 1798 (Gratiolae, Plantaginaceae) was performed. This is the first study of nuclear DNA content carried out in the genus. Mitotic analysis revealed a base chromosome number x = 11 for all entities and different ploidy levels, ranging from diploid (2n = 2x = 22) to hexaploid (2n = 6x = 66). The results include the ﬁrst report of the chromosome numbers for Mecardonia flagellaris (Chamisso & Schlechtendal, 1827) (2n = 22), Mecardonia grandiflora (Bentham) Pennell, 1946 (2n = 22), Mecardonia kamogawae Greppi & Hagiwara, 2011 (2n = 66), and Mecardonia sp. (2n = 44). The three ploidy levels here reported suggest that polyploidy is common in Mecardonia and appear to be an important factor in the evolution of this genus. The 2C- and 1Cx-values were also estimated in all the species. The 2C-values ranged from 1.91 to 5.29 pg. The 1Cx-values ranged from 0.88 to 1.03 pg. The general tendency indicated a decrease in the 1Cx-value with increasing ploidy level. The signiﬁcance of the results is discussed in relation to taxonomy of the genus.

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IAPT chromosome data 33

Marhold

Kučera

Acuña

et al. 2020

TAXON

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Genome size variation and incidence of polyploidy in Scrophulariaceae sensu lato from the Iberian Peninsula

Abstract: In this work, genome size variation and polyploidy incidence in Scrophulariaceae from the Iberian Peninsula were addressed, with the obtained results providing important background information for subsequent studies, with several future perspectives being opened.

Cited by 19 publications

References 36 publications

Is genome downsizing associated with diversification in polyploid lineages ofVeronica?

Is genome downsizing associated with diversification in polyploid lineages ofVeronica?

Chromosome numbers and DNA content in some species of Mecardonia (Gratiolae, Plantaginaceae)

IAPT chromosome data 33

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