Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae)
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Hoehnea |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2236-89062015000200233 |
Resumo: | ABSTRACTArgyrochosma nivea var. tenera is a cheilanthoid fern from the American continent. We present herewith the study of meiotic behavior and gametic number as well as number of spores and reproduction mode (with observations from cultured gametophytes). The study material is from Northwestern Argentina. For the study of meiosis, sporangia were fixed in ethanol-acetic acid (3:1) and stained with 2% propionic haematoxylin. Micrographs were taken using light and scanning electron microscopes. Meiotic chromosome number is 2n = 3x = 81 and the presence of lagging chromosomes at telophase II is mentioned for the first time; three sets of chromosome occur at diakinesis. Sporangia have 32 trilete spores. Adult gametophytes are laminar, cordiform, asymetrical, glabrous, without glandular trichomes. In our samples, the adult gametophytes were neuter, without antheridia or archegonia, with obligate apogamous reproduction. Both populations studied might be of hybrid origin. |
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Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae)apogamyArgyrochosmachromosome numberlagging chromosomesABSTRACTArgyrochosma nivea var. tenera is a cheilanthoid fern from the American continent. We present herewith the study of meiotic behavior and gametic number as well as number of spores and reproduction mode (with observations from cultured gametophytes). The study material is from Northwestern Argentina. For the study of meiosis, sporangia were fixed in ethanol-acetic acid (3:1) and stained with 2% propionic haematoxylin. Micrographs were taken using light and scanning electron microscopes. Meiotic chromosome number is 2n = 3x = 81 and the presence of lagging chromosomes at telophase II is mentioned for the first time; three sets of chromosome occur at diakinesis. Sporangia have 32 trilete spores. Adult gametophytes are laminar, cordiform, asymetrical, glabrous, without glandular trichomes. In our samples, the adult gametophytes were neuter, without antheridia or archegonia, with obligate apogamous reproduction. Both populations studied might be of hybrid origin.Instituto de Pesquisas Ambientais2015-06-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S2236-89062015000200233Hoehnea v.42 n.2 2015reponame:Hoehneainstname:Instituto de Botânica (IBT)instacron:IBT10.1590/2236-8906-36/2014info:eu-repo/semantics/openAccessHernández,Marcela A.Andrada,Aldo R.Páez,Valeria de los A.Martínez,Olga G.eng2015-10-27T00:00:00Zoai:scielo:S2236-89062015000200233Revistahttp://www.ibot.sp.gov.br/publicacoes/hoehnea/sobre_hoehnea.phpPUBhttps://old.scielo.br/oai/scielo-oai.php||hoehneaibt@gmail.com2236-89060073-2877opendoar:2015-10-27T00:00Hoehnea - Instituto de Botânica (IBT)false |
dc.title.none.fl_str_mv |
Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae) |
title |
Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae) |
spellingShingle |
Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae) Hernández,Marcela A. apogamy Argyrochosma chromosome number lagging chromosomes |
title_short |
Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae) |
title_full |
Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae) |
title_fullStr |
Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae) |
title_full_unstemmed |
Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae) |
title_sort |
Ploidy level and obligate apogamy in two populations of Argyrochosma nivea var. tenera(Pteridaceae) |
author |
Hernández,Marcela A. |
author_facet |
Hernández,Marcela A. Andrada,Aldo R. Páez,Valeria de los A. Martínez,Olga G. |
author_role |
author |
author2 |
Andrada,Aldo R. Páez,Valeria de los A. Martínez,Olga G. |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Hernández,Marcela A. Andrada,Aldo R. Páez,Valeria de los A. Martínez,Olga G. |
dc.subject.por.fl_str_mv |
apogamy Argyrochosma chromosome number lagging chromosomes |
topic |
apogamy Argyrochosma chromosome number lagging chromosomes |
description |
ABSTRACTArgyrochosma nivea var. tenera is a cheilanthoid fern from the American continent. We present herewith the study of meiotic behavior and gametic number as well as number of spores and reproduction mode (with observations from cultured gametophytes). The study material is from Northwestern Argentina. For the study of meiosis, sporangia were fixed in ethanol-acetic acid (3:1) and stained with 2% propionic haematoxylin. Micrographs were taken using light and scanning electron microscopes. Meiotic chromosome number is 2n = 3x = 81 and the presence of lagging chromosomes at telophase II is mentioned for the first time; three sets of chromosome occur at diakinesis. Sporangia have 32 trilete spores. Adult gametophytes are laminar, cordiform, asymetrical, glabrous, without glandular trichomes. In our samples, the adult gametophytes were neuter, without antheridia or archegonia, with obligate apogamous reproduction. Both populations studied might be of hybrid origin. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-06-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2236-89062015000200233 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S2236-89062015000200233 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/2236-8906-36/2014 |
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 |
Instituto de Pesquisas Ambientais |
publisher.none.fl_str_mv |
Instituto de Pesquisas Ambientais |
dc.source.none.fl_str_mv |
Hoehnea v.42 n.2 2015 reponame:Hoehnea instname:Instituto de Botânica (IBT) instacron:IBT |
instname_str |
Instituto de Botânica (IBT) |
instacron_str |
IBT |
institution |
IBT |
reponame_str |
Hoehnea |
collection |
Hoehnea |
repository.name.fl_str_mv |
Hoehnea - Instituto de Botânica (IBT) |
repository.mail.fl_str_mv |
||hoehneaibt@gmail.com |
_version_ |
1754193647182544896 |