Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels

Detalhes bibliográficos
Autor(a) principal: Marques,André
Data de Publicação: 2010
Outros Autores: Roa,Fernando, Guerra,Marcelo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Genetics and Molecular Biology
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400020
Resumo: Most species of the genus Tripogandra (Commelinaceae) are taxonomically poorly circumscribed, in spite of having a relatively stable basic number x = 8. Aiming to estimate the cytological variation among Tripogandra species carrying this base number, several structural karyotypic characters were investigated in the diploid T. glandulosa, the hexaploid T. serrulata, and the octoploid T. diuretica. A careful evaluation of chromosome size and morphology did not reveal clear chromosome homeologies among karyotypes. The mean chromosome size was strongly reduced in the octoploid species, but not in the hexaploid species. They also differed largely in the CMA+ banding pattern and in the number of 5S and 45S rDNA sites per monoploid chromosome complement. All three species showed proximal DAPI+ heterochromatin, although in T. serrulata this kind of heterochromatin was only visible after FISH. Further, the meiosis in T. serrulata was highly irregular, suggesting that this species has a hybrid origin. The data indicate that, in spite of the conservation of the base number, these species are karyologically quite different from each other.
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spelling Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levelsTripogandracytotaxonomyrDNA sitesCMA/DAPI bandsmeiosisMost species of the genus Tripogandra (Commelinaceae) are taxonomically poorly circumscribed, in spite of having a relatively stable basic number x = 8. Aiming to estimate the cytological variation among Tripogandra species carrying this base number, several structural karyotypic characters were investigated in the diploid T. glandulosa, the hexaploid T. serrulata, and the octoploid T. diuretica. A careful evaluation of chromosome size and morphology did not reveal clear chromosome homeologies among karyotypes. The mean chromosome size was strongly reduced in the octoploid species, but not in the hexaploid species. They also differed largely in the CMA+ banding pattern and in the number of 5S and 45S rDNA sites per monoploid chromosome complement. All three species showed proximal DAPI+ heterochromatin, although in T. serrulata this kind of heterochromatin was only visible after FISH. Further, the meiosis in T. serrulata was highly irregular, suggesting that this species has a hybrid origin. The data indicate that, in spite of the conservation of the base number, these species are karyologically quite different from each other.Sociedade Brasileira de Genética2010-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400020Genetics and Molecular Biology v.33 n.4 2010reponame:Genetics and Molecular Biologyinstname:Sociedade Brasileira de Genética (SBG)instacron:SBG10.1590/S1415-47572010005000085info:eu-repo/semantics/openAccessMarques,AndréRoa,FernandoGuerra,Marceloeng2011-01-06T00:00:00Zoai:scielo:S1415-47572010000400020Revistahttp://www.gmb.org.br/ONGhttps://old.scielo.br/oai/scielo-oai.php||editor@gmb.org.br1678-46851415-4757opendoar:2011-01-06T00:00Genetics and Molecular Biology - Sociedade Brasileira de Genética (SBG)false
dc.title.none.fl_str_mv Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
title Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
spellingShingle Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
Marques,André
Tripogandra
cytotaxonomy
rDNA sites
CMA/DAPI bands
meiosis
title_short Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
title_full Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
title_fullStr Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
title_full_unstemmed Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
title_sort Karyotype differentiation in three species of Tripogandra Raf. (Commelinaceae) with different ploidy levels
author Marques,André
author_facet Marques,André
Roa,Fernando
Guerra,Marcelo
author_role author
author2 Roa,Fernando
Guerra,Marcelo
author2_role author
author
dc.contributor.author.fl_str_mv Marques,André
Roa,Fernando
Guerra,Marcelo
dc.subject.por.fl_str_mv Tripogandra
cytotaxonomy
rDNA sites
CMA/DAPI bands
meiosis
topic Tripogandra
cytotaxonomy
rDNA sites
CMA/DAPI bands
meiosis
description Most species of the genus Tripogandra (Commelinaceae) are taxonomically poorly circumscribed, in spite of having a relatively stable basic number x = 8. Aiming to estimate the cytological variation among Tripogandra species carrying this base number, several structural karyotypic characters were investigated in the diploid T. glandulosa, the hexaploid T. serrulata, and the octoploid T. diuretica. A careful evaluation of chromosome size and morphology did not reveal clear chromosome homeologies among karyotypes. The mean chromosome size was strongly reduced in the octoploid species, but not in the hexaploid species. They also differed largely in the CMA+ banding pattern and in the number of 5S and 45S rDNA sites per monoploid chromosome complement. All three species showed proximal DAPI+ heterochromatin, although in T. serrulata this kind of heterochromatin was only visible after FISH. Further, the meiosis in T. serrulata was highly irregular, suggesting that this species has a hybrid origin. The data indicate that, in spite of the conservation of the base number, these species are karyologically quite different from each other.
publishDate 2010
dc.date.none.fl_str_mv 2010-01-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
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dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400020
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572010000400020
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1415-47572010005000085
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Sociedade Brasileira de Genética
publisher.none.fl_str_mv Sociedade Brasileira de Genética
dc.source.none.fl_str_mv Genetics and Molecular Biology v.33 n.4 2010
reponame:Genetics and Molecular Biology
instname:Sociedade Brasileira de Genética (SBG)
instacron:SBG
instname_str Sociedade Brasileira de Genética (SBG)
instacron_str SBG
institution SBG
reponame_str Genetics and Molecular Biology
collection Genetics and Molecular Biology
repository.name.fl_str_mv Genetics and Molecular Biology - Sociedade Brasileira de Genética (SBG)
repository.mail.fl_str_mv ||editor@gmb.org.br
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