Cytogenetics and embryology of Eupatorium laevigatum (Compositae)

Detalhes bibliográficos
Autor(a) principal: Bertasso-Borges,Maristela Sanches
Data de Publicação: 2005
Outros Autores: Coleman,James Robert
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=S1415-47572005000100022
Resumo: Embryological studies indicate Eupatorium laevigatum to have Antennaria type diplospory with precocious embryony. The embryo sac is of the Polygonum type and the polar nuclei fuse before anthesis (maturation of the stamens). Endosperm development is autonomous and the central cell divides only after the initial stages of embryo formation. It is estimated that about 10% of the florets in anthesis contain an undivided egg which can be used for sexual reproduction. The study of microsporogenesis revealed abnormalities in chromosome pairing which result in the formation of univalents, bivalents, trivalents and higher polyvalents, with the consequent production of lagging chromosomes, unbalanced nuclei, micronuclei and sterile pollen. We found that, as represented by the material studied, E. laevigatum is an autohexaploid (2n = 6x = 60) in which each chromosome of a basic set of ten chromosomes is repeated six times and that E. laevigatum is an essentialy obligate apomictic.
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spelling Cytogenetics and embryology of Eupatorium laevigatum (Compositae)Eupatoriumapomixisplant cytogeneticsplant embryologyAsteraceaeEmbryological studies indicate Eupatorium laevigatum to have Antennaria type diplospory with precocious embryony. The embryo sac is of the Polygonum type and the polar nuclei fuse before anthesis (maturation of the stamens). Endosperm development is autonomous and the central cell divides only after the initial stages of embryo formation. It is estimated that about 10% of the florets in anthesis contain an undivided egg which can be used for sexual reproduction. The study of microsporogenesis revealed abnormalities in chromosome pairing which result in the formation of univalents, bivalents, trivalents and higher polyvalents, with the consequent production of lagging chromosomes, unbalanced nuclei, micronuclei and sterile pollen. We found that, as represented by the material studied, E. laevigatum is an autohexaploid (2n = 6x = 60) in which each chromosome of a basic set of ten chromosomes is repeated six times and that E. laevigatum is an essentialy obligate apomictic.Sociedade Brasileira de Genética2005-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100022Genetics and Molecular Biology v.28 n.1 2005reponame:Genetics and Molecular Biologyinstname:Sociedade Brasileira de Genética (SBG)instacron:SBG10.1590/S1415-47572005000100022info:eu-repo/semantics/openAccessBertasso-Borges,Maristela SanchesColeman,James Roberteng2005-09-08T00:00:00Zoai:scielo:S1415-47572005000100022Revistahttp://www.gmb.org.br/ONGhttps://old.scielo.br/oai/scielo-oai.php||editor@gmb.org.br1678-46851415-4757opendoar:2005-09-08T00:00Genetics and Molecular Biology - Sociedade Brasileira de Genética (SBG)false
dc.title.none.fl_str_mv Cytogenetics and embryology of Eupatorium laevigatum (Compositae)
title Cytogenetics and embryology of Eupatorium laevigatum (Compositae)
spellingShingle Cytogenetics and embryology of Eupatorium laevigatum (Compositae)
Bertasso-Borges,Maristela Sanches
Eupatorium
apomixis
plant cytogenetics
plant embryology
Asteraceae
title_short Cytogenetics and embryology of Eupatorium laevigatum (Compositae)
title_full Cytogenetics and embryology of Eupatorium laevigatum (Compositae)
title_fullStr Cytogenetics and embryology of Eupatorium laevigatum (Compositae)
title_full_unstemmed Cytogenetics and embryology of Eupatorium laevigatum (Compositae)
title_sort Cytogenetics and embryology of Eupatorium laevigatum (Compositae)
author Bertasso-Borges,Maristela Sanches
author_facet Bertasso-Borges,Maristela Sanches
Coleman,James Robert
author_role author
author2 Coleman,James Robert
author2_role author
dc.contributor.author.fl_str_mv Bertasso-Borges,Maristela Sanches
Coleman,James Robert
dc.subject.por.fl_str_mv Eupatorium
apomixis
plant cytogenetics
plant embryology
Asteraceae
topic Eupatorium
apomixis
plant cytogenetics
plant embryology
Asteraceae
description Embryological studies indicate Eupatorium laevigatum to have Antennaria type diplospory with precocious embryony. The embryo sac is of the Polygonum type and the polar nuclei fuse before anthesis (maturation of the stamens). Endosperm development is autonomous and the central cell divides only after the initial stages of embryo formation. It is estimated that about 10% of the florets in anthesis contain an undivided egg which can be used for sexual reproduction. The study of microsporogenesis revealed abnormalities in chromosome pairing which result in the formation of univalents, bivalents, trivalents and higher polyvalents, with the consequent production of lagging chromosomes, unbalanced nuclei, micronuclei and sterile pollen. We found that, as represented by the material studied, E. laevigatum is an autohexaploid (2n = 6x = 60) in which each chromosome of a basic set of ten chromosomes is repeated six times and that E. laevigatum is an essentialy obligate apomictic.
publishDate 2005
dc.date.none.fl_str_mv 2005-03-01
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=S1415-47572005000100022
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000100022
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S1415-47572005000100022
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.28 n.1 2005
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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