DNA content and chromosome evolution in the shrubby <i>Oxalis</i>

Azkue, Daniel de; Martínez, Arturo

doi:10.1139/g88-010

Cited by 27 publications

(8 citation statements)

References 12 publications

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“…- Table 1 clearly shows a positive correlation between chromosome length of the 2n complement and DNA content in the hexaploid, tetraploid and most of the diploid species of Peperomia; a condition similarily demonstrated for Lathyrus (REEs and HAZARIKA 1967) and Oxalis species (DE AzKuE and MARTINEZ 1988) and suggested for arboreal plants (GRANT 1976). However, the DNA content of the triploid P. metallica is much higher than expected regarding its chromosome length.…”

Section: Resultssupporting

confidence: 57%

Nuclear DNA measurements in diploid and polyploid species ofPeperomia(Piperaceae)

Samuel

Morawetz

1992

Caryologia

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SUMMARY -Nuclear DNA contents were measured in eight species of Peperomia (2n=22, 33, 44, 66). Formaldehyde fixations show more reliable results than those with acetic alcohol. The diploid species vary significantly in chromosome size and DNA-content. Increasing chromosome length is directly correlated with increased DNA-amounts/chromosome in all the species except in triploid P. metallica. Polyploid species have increased DNA-values.

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Section: Resultssupporting

confidence: 57%

Nuclear DNA measurements in diploid and polyploid species ofPeperomia(Piperaceae)

Samuel

Morawetz

1992

Caryologia

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“…Oxalis sect. Corniculatae and O. barrelieri were always among the first lineages to separate within Oxalis, followed by successive branches leading to O. acetosella, the clade containing the O. tuberosa alliance (de Azkue & Martinez, 1990;Emshwiller, 2002) and sect. Ionoxalis, which was generally resolved as sister lineage to an SA Oxalis clade (clade 1, Fig.…”

Section: Resultsmentioning

confidence: 99%

Molecular phylogenetics and origins of southern African Oxalis

Oberlander

Dreyer

Bellstedt

2011

TAXON

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Despite being a speciose component of the Cape Floristic Region at the southern tip of Africa, the southern African Oxalis lineage is systematically poorly understood. Palynological and preliminary phylogenetic studies of the group contrast with the current taxonomy, and indicate the need for further research. Here we present a largescale phylogenetic analysis comprising 150 of ± 210 southern African species, sampled for plastid trnL–F and trnS–G and nuclear ITS markers, using three different inference methods. Secondly, we explore the origins of southern African Oxalis as a potential Cape clade. Despite substantial localised incongruence between plastid and nuclear datasets, analyses agreed on a monophyletic southern African clade, which consists of two species–poor and one extremely species–rich lineages. The current taxonomy is shown to be artificial, with not one section retrieved as monophyletic. Our topologies are consistent with previous palynological and phylogenetic studies, and provide a backbone for future systematic work. Reconstructions of ancestral area for the southern African lineage support an origin within or close to the Cape Floristic Region.

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“…The short generation time and the sexual allogamous reproduction in the Xeranthemum group may lead to the conclusion that these taxa can accumulate many changes in a relatively short period of time, which can be translated into genome changes in chromosome number as well as in DNA content. A versatile recombination system could be responsible for these variations, as reported in Oxalis (De Azkue and Martínez, 1988). This mechanism could offer the possibility of rapid adaptation to arid environments or ruderal places, where these plants frequently live.…”

Section: Ecological and Life Cycle Implicationsmentioning

confidence: 87%

Genome size in Echinops L. and related genera (Asteraceae, Cardueae): karyological, ecological and phylogenetic implications

Garnatje

Vallès

Garcia

et al. 2004

Biology of the Cell

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Genome size was assessed by flow cytometry in 33 species belonging to seven genera of the tribe Cardueae (Asteraceae), which can be grouped in three taxonomic complexes. 2C nuclear DNA content ranged from 1.49 to 16.98 pg, which is more than elevenfold variation. Genome size correlated well with some karyological traits. Nuclear DNA amount variations also have systematic and evolutionary implications and/or are linked to adaptations to ecological conditions.

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DNA content and chromosome evolution in the shrubby Oxalis

Cited by 27 publications

References 12 publications

Nuclear DNA measurements in diploid and polyploid species ofPeperomia(Piperaceae)

Nuclear DNA measurements in diploid and polyploid species ofPeperomia(Piperaceae)

Molecular phylogenetics and origins of southern African Oxalis

Genome size in Echinops L. and related genera (Asteraceae, Cardueae): karyological, ecological and phylogenetic implications

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