Chromosome Stuides in Argentinian Species of Stemodia L.(Scrophulariaceae).

Sosa, María de las Mercedes; Seijo, Guillermo

doi:10.1508/cytologia.67.261

Cited by 6 publications

(13 citation statements)

References 11 publications

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“…These differences may result from the fact that Sosa and Seijo analyzed only one metaphase plate, while in this work we analyzed 10 metaphase plates to reduce the error. The presence of satellites, earlier reported for S. viscosa and S. lanceolata (Subramanian & Pondmudi 1987;Sosa & Seijo 2002), was confirmed in this work for S. lanceolata. The karyotype formula (20m þ 2sm) found in the diploid species suggests that no great structural changes, which commonly cause alterations in the chromosome morphology, have occurred during the evolution of the genus.…”

Section: Discussionsupporting

confidence: 91%

“…All the species analyzed have the basic number x ¼ 11, which agrees with the results previously obtained for the species of the New World (Fedorov 1974;Turner & Cowan 1993;Sosa & Seijo 2002;Sosa et al 2008). These results demonstrate that the South American species would present exclusively x ¼ 11, whereas the species of the Old World have x ¼ 7 and x ¼ 11.…”

Section: Discussionsupporting

confidence: 88%

“…The results found in S. lanceolata and S. verticillata differ in chromosome size and karyotype formula with respect to a previous study carried out by Sosa and Seijo (2002). In this analysis, we observed 16m þ 6sm in both taxa and a greater size of the chromosomal complement.…”

Section: Discussioncontrasting

confidence: 64%

“…The most recent contributions for the genus were carried out by Sosa and Seijo (2002) and Sosa et al (2009), who analyzed eight species of Stemodia that grow in South America: S. ericifolia, S. hassleriana, S. hyptoides, S. lanceolata, S. palustris, S. stricta and S. verticillata with 2n ¼ 22, S. lobelioides and S. hyptoides with 2n ¼ 44 and S. hyptoides with 2n ¼ 66. Sosa and Seijo (2002) also described the karyotypes of S. lanceolata and S. verticillata.…”

Section: Introductionmentioning

confidence: 99%

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Karyotype analysis of the southernmost South American species ofStemodia(Scrophulariaceae)

Sosa

Panseri

Fernández

2011

Plant Biosystems - An International Journal Dealing with all As

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The aim of the present study was to examine the somatic chromosomes of seven species of Stemodia (Scrophulariaceae). The karyotypes of Stemodia ericifolia (2nwere analyzed for the first time. All the species studied showed a predominance of metacentric chromosomes and a lower proportion of submetacentric pairs. The chromosomes in all the species were found to be small with a mean chromosome length of 1.42 mm, varying from 0.77 mm in S. hyptoides (2n ¼ 66) to 2.10 mm in S. lanceolata. The differences in the asymmetry of the karyotypes were small, for which it is possible to assume that the great diversification of the genus has been accompanied by very small changes in the structure of the chromosomes.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 88%

Section: Discussioncontrasting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Karyotype analysis of the southernmost South American species ofStemodia(Scrophulariaceae)

Sosa

Panseri

Fernández

2011

Plant Biosystems - An International Journal Dealing with all As

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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%

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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