Cytogeographic Analysis of Southern South American Species of<i>Stemodia</i>(Scrophulariaceae)

Sosa, María de las Mercedes; Seijo, Guillermo; Fernández, Aveliano

doi:10.5735/085.046.0503

Cited by 5 publications

(6 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We confirmed that the Stemodia diplohyptoides is diploid (2n=22), as reported in Sosa et al (2009), while the related S. hyptoides has polyploid cytotypes with 2n=44 and 2n=66 (Sosa & Seijo, 2002, Sosa et al 2009. The same chromosome number (2n=2x=22) is found in other related species of Stemodia such as S. stricta or S. lanceolata (Sosa et al 2009), and as in those the chromosomes are small (1.7 μm).…”

Section: Discussionsupporting

confidence: 86%

“…In addition to morphological features, diploid and polyploid plants have quite different geographic distributions (Sosa et al 2009). Stemodia hyptoides has a wide distribution throughout the east of Espinal and Chaco phytogeographic provinces, the northeast of the Pampean province of the Chaco domain and in southwest of the Paranaense province of the Amazonian phytogeographic domain (Cabrera 1971;Cabrera & Willink 1973).…”

Section: Discussionmentioning

confidence: 99%

“…Particular cases are S. stricta Chamisso & Schlechtendal (1828: 10), S. hyptoides Chamisso & Schlechtendal (1828: 8) and S. lanceolata Bentham (1846: 384) which are partially sympatric species distributed in northern Argentina. Moreover, the reports of different ploidy levels within some Stemodia species (Sosa & Seijo 2002, Sosa et al 2009, 2011 suggest that the morphological variation found between and within species could be, at least in part, the result of the polyploidization process.…”

Section: Introductionmentioning

confidence: 99%

“…Stemodia hyptoides is currently recognized as a single taxonomic entity having diploid (2n=22), tetraploid (2n=44) and hexaploid (2n=66) populations (Sosa & Seijo, 2002;Sosa et al 2009).…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Stemodia diplohyptoides (Plantaginaceae, Gratiolae): a new diploid species from South America

Sosa

Dematteis

2014

Phytotaxa

View full text Add to dashboard Cite

Stemodia diplohyptoides (Plantaginaceae), a new species from Gratiolae tribe is described and illustrated. This taxon is found in northeastern Argentina, at the edge of the Parana River that surrounds the north and center of Misiones province (Argentina). It is a diploid that has been traditionally treated under Stemodia hyptoides, which is here re-circumscribed to include only autopolyploid plants (tetraploid and hexaploid). The diploid specimens may be distinguished from the polyploid S. hyptoides by several morphological features such as shape, pubescence and margin of the leaves, corolla length and corolla tube pubescence. In addition, scanning electron microphotographs of seeds, chromosomes numbers, a distribution map and a key to distinguish the related species are also provided. On the basis of morphological, cytological and geographical data, some evolutionary considerations are inferred.

show abstract

Section: Discussionsupporting

confidence: 86%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Stemodia hyptoides is currently recognized as a single taxonomic entity having diploid (2n=22), tetraploid (2n=44) and hexaploid (2n=66) populations (Sosa & Seijo, 2002;Sosa et al 2009).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stemodia diplohyptoides (Plantaginaceae, Gratiolae): a new diploid species from South America

Sosa

Dematteis

2014

Phytotaxa

View full text Add to dashboard Cite

show abstract

“…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%

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

Sosa

Panseri

Fernández

2011

Plant Biosystems - An International Journal Dealing with all As

View full text Add to dashboard Cite

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.

show abstract

Morphometric analysis of Stemodia hyptoides and S. stricta (Plantaginaceae)

2012

View full text Add to dashboard Cite

Cytogeographic Analysis of Southern South American Species ofStemodia(Scrophulariaceae)

Cited by 5 publications

References 9 publications

Stemodia diplohyptoides (Plantaginaceae, Gratiolae): a new diploid species from South America

Stemodia diplohyptoides (Plantaginaceae, Gratiolae): a new diploid species from South America

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

Morphometric analysis of Stemodia hyptoides and S. stricta (Plantaginaceae)

Contact Info

Product

Resources

About