Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.)
Autor(a) principal: | |
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Data de Publicação: | 2008 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Acta Scientiarum Biological Sciences |
Texto Completo: | http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2811 |
Resumo: | Chiasma counting has been regarded as the most straightforward method of scoring the total number of crossing-over events in the genome. In organisms in which genetic analysis is difficult or impossible to perform, it is a good estimator of the level of genetic recombination. In this paper we evaluated the chiasma frequency and distribution at diakinesis of twelve Brazilian oat varieties (Avena sativa), a hexaploid species with cytologically well-defined meiotic chromosomes. There was a high homogeneity of chiasma formation among varieties. The chiasma frequency per microsporocyte ranged from 41.66 to 42.00 among varieties. The frequency of interstitial and terminal chiasmata was more variable. The bivalents may present one, two or three chiasmata, but those with two terminal chiasmata were more frequent. The frequency of univalents was very low at diakinesis but high in metaphase I, suggesting precocious chiasma terminalization. The implications of these findings for oat breeding are discussed |
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Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.)Freqüência, distribuição e terminalização de quiasmas em aveias hexaplóides (Avena sativa L.)frequência de quiasmasdistribuição de quiasmasterminalização de quiasmasaveia2.00.00.00-6 Ciências BiológicasChiasma counting has been regarded as the most straightforward method of scoring the total number of crossing-over events in the genome. In organisms in which genetic analysis is difficult or impossible to perform, it is a good estimator of the level of genetic recombination. In this paper we evaluated the chiasma frequency and distribution at diakinesis of twelve Brazilian oat varieties (Avena sativa), a hexaploid species with cytologically well-defined meiotic chromosomes. There was a high homogeneity of chiasma formation among varieties. The chiasma frequency per microsporocyte ranged from 41.66 to 42.00 among varieties. The frequency of interstitial and terminal chiasmata was more variable. The bivalents may present one, two or three chiasmata, but those with two terminal chiasmata were more frequent. The frequency of univalents was very low at diakinesis but high in metaphase I, suggesting precocious chiasma terminalization. The implications of these findings for oat breeding are discussedA contagem de quiasmas tem sido reconhecida como um dos métodos mais apurados para se avaliar o número total de eventos de permuta genética no genoma. Em organismos em que a análise genética é difícil ou impossível de realizar, ela torna-se um bom índice para a avaliação do nível de recombinação genética. Neste artigo, avaliaram-se a frequência e a distribuição de quiasmas na diacinese em 12 variedades brasileiras de aveia (Avena sativa), uma espécie hexaplóide com cromossomos meióticos citologicamente bem definidos. Houve uma alta homogeneidade na formação de quiasmas entre as variedades. A frequência de quiasmas por microsporócitos variou de 41,66 a 42,00 entre as variedades. As frequências de quiasmas terminais e intersticiais foram mais variáveis. Os bivalentes apresentaram um, dois ou três quiasmas, havendo predominância de bivalentes com dois quiasmas terminais. A frequência de univalentes foi baixa na diacinese, mas alta em metáfase sugerindo terminalização precoce de quiasmas. As implicações destes resultados para o melhoramento de aveia são discutidosUniversidade Estadual De Maringá2008-05-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/281110.4025/actascibiolsci.v22i0.2811Acta Scientiarum. Biological Sciences; Vol 22 (2000); 269-273Acta Scientiarum. Biological Sciences; v. 22 (2000); 269-2731807-863X1679-9283reponame:Acta Scientiarum Biological Sciencesinstname:Universidade Estadual de Maringá (UEM)instacron:UEMporhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2811/2088Pagliarini, Maria SuelyBaptista-Giacomelli, Flávia RoseliAlmeida, Juliano Luiz deinfo:eu-repo/semantics/openAccess2022-11-23T17:33:30Zoai:periodicos.uem.br/ojs:article/2811Revistahttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSciPUBhttp://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/oai||actabiol@uem.br1807-863X1679-9283opendoar:2022-11-23T17:33:30Acta Scientiarum Biological Sciences - Universidade Estadual de Maringá (UEM)false |
dc.title.none.fl_str_mv |
Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.) Freqüência, distribuição e terminalização de quiasmas em aveias hexaplóides (Avena sativa L.) |
title |
Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.) |
spellingShingle |
Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.) Pagliarini, Maria Suely frequência de quiasmas distribuição de quiasmas terminalização de quiasmas aveia 2.00.00.00-6 Ciências Biológicas |
title_short |
Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.) |
title_full |
Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.) |
title_fullStr |
Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.) |
title_full_unstemmed |
Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.) |
title_sort |
Chiasma frequency, distribution and terminalization in hexaploid oats (Avena sativa L.) |
author |
Pagliarini, Maria Suely |
author_facet |
Pagliarini, Maria Suely Baptista-Giacomelli, Flávia Roseli Almeida, Juliano Luiz de |
author_role |
author |
author2 |
Baptista-Giacomelli, Flávia Roseli Almeida, Juliano Luiz de |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Pagliarini, Maria Suely Baptista-Giacomelli, Flávia Roseli Almeida, Juliano Luiz de |
dc.subject.por.fl_str_mv |
frequência de quiasmas distribuição de quiasmas terminalização de quiasmas aveia 2.00.00.00-6 Ciências Biológicas |
topic |
frequência de quiasmas distribuição de quiasmas terminalização de quiasmas aveia 2.00.00.00-6 Ciências Biológicas |
description |
Chiasma counting has been regarded as the most straightforward method of scoring the total number of crossing-over events in the genome. In organisms in which genetic analysis is difficult or impossible to perform, it is a good estimator of the level of genetic recombination. In this paper we evaluated the chiasma frequency and distribution at diakinesis of twelve Brazilian oat varieties (Avena sativa), a hexaploid species with cytologically well-defined meiotic chromosomes. There was a high homogeneity of chiasma formation among varieties. The chiasma frequency per microsporocyte ranged from 41.66 to 42.00 among varieties. The frequency of interstitial and terminal chiasmata was more variable. The bivalents may present one, two or three chiasmata, but those with two terminal chiasmata were more frequent. The frequency of univalents was very low at diakinesis but high in metaphase I, suggesting precocious chiasma terminalization. The implications of these findings for oat breeding are discussed |
publishDate |
2008 |
dc.date.none.fl_str_mv |
2008-05-09 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2811 10.4025/actascibiolsci.v22i0.2811 |
url |
http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2811 |
identifier_str_mv |
10.4025/actascibiolsci.v22i0.2811 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
http://www.periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/2811/2088 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Estadual De Maringá |
publisher.none.fl_str_mv |
Universidade Estadual De Maringá |
dc.source.none.fl_str_mv |
Acta Scientiarum. Biological Sciences; Vol 22 (2000); 269-273 Acta Scientiarum. Biological Sciences; v. 22 (2000); 269-273 1807-863X 1679-9283 reponame:Acta Scientiarum Biological Sciences instname:Universidade Estadual de Maringá (UEM) instacron:UEM |
instname_str |
Universidade Estadual de Maringá (UEM) |
instacron_str |
UEM |
institution |
UEM |
reponame_str |
Acta Scientiarum Biological Sciences |
collection |
Acta Scientiarum Biological Sciences |
repository.name.fl_str_mv |
Acta Scientiarum Biological Sciences - Universidade Estadual de Maringá (UEM) |
repository.mail.fl_str_mv |
||actabiol@uem.br |
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1799317390985527296 |