Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UFLA |
Texto Completo: | http://repositorio.ufla.br/jspui/handle/1/13805 http://www.coffeescience.ufla.br/index.php/Coffeescience/article/view/301 |
Resumo: | Little is known about the radiation effect on the induction and differentiation phases of reproductive nodes of Coffea arabica L. This knowledge would allow defining shading levels, or planting densities, appropriate to maximize the development, the production and the sustainability of the coffee crop. Floral differentiation was evaluated in plants of ‘Catuai Vermelho IAC 81, cultivated under four radiation regimes (30, 50, 70 and 100%), by using different plastic screens. Plagiotropic branches with fruits were collected from february to september, for two consecutive years. Slides of longitudinal sections of the node regions were mounted for the characterization and quantification of histological stages of bud differentiation. The undifferentiated buds formation began in February and, their differentiation to reproductive buds, in April/May. At the end of July practically all buds were already reproducing. The percentage of undifferentiated buds in February was 50% lower in 2005 because the sample branches had a large number of fruits in the basal region, indicating that the branches in a year of high production show a delay in flower bud differentiation in relation to the branches with few fruits during low productive years. The intermediate levels of shading, 50 to 70%, solar radiation, anticipated the development of buds from the plants grown under full sun in years of high production, the opposite occurred in the low productive years. The percentage of undifferentiated buds between irradiance treatments varied more than the percentage of reproductive buds, indicating that the radiation intensity has a greater effect in the early stages of floral differentiation. |
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Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiaçãoFloral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiationCafeiculturaAnatomia das gemasCiências agráriasFenologiaFloraçãoLittle is known about the radiation effect on the induction and differentiation phases of reproductive nodes of Coffea arabica L. This knowledge would allow defining shading levels, or planting densities, appropriate to maximize the development, the production and the sustainability of the coffee crop. Floral differentiation was evaluated in plants of ‘Catuai Vermelho IAC 81, cultivated under four radiation regimes (30, 50, 70 and 100%), by using different plastic screens. Plagiotropic branches with fruits were collected from february to september, for two consecutive years. Slides of longitudinal sections of the node regions were mounted for the characterization and quantification of histological stages of bud differentiation. The undifferentiated buds formation began in February and, their differentiation to reproductive buds, in April/May. At the end of July practically all buds were already reproducing. The percentage of undifferentiated buds in February was 50% lower in 2005 because the sample branches had a large number of fruits in the basal region, indicating that the branches in a year of high production show a delay in flower bud differentiation in relation to the branches with few fruits during low productive years. The intermediate levels of shading, 50 to 70%, solar radiation, anticipated the development of buds from the plants grown under full sun in years of high production, the opposite occurred in the low productive years. The percentage of undifferentiated buds between irradiance treatments varied more than the percentage of reproductive buds, indicating that the radiation intensity has a greater effect in the early stages of floral differentiation.São poucas as informações sobre a influência da radiação nos processos de indução e diferenciação de gemas reprodutivas em Coffea arabica L. Esse conhecimento permite definir níveis de sombreamento ou a densidade de plantio para maximizar o desenvolvimento, a produção e a sustentabilidade dessa cultura. Avaliou-se a diferenciação floral da cultivar Catuaí Vermelho IAC 81, sob quatro níveis de radiação solar (30, 50, 70 e 100%), obtidos com o uso de telas de sombrites. Ramos plagiotrópicos com frutos foram coletados, de fevereiro a setembro, durante dois anos consecutivos. Lâminas contendo cortes longitudinais na região do nó foram preparadas para a caracterização e quantificação dos estádios de diferenciação histológica. A formação de gemas indiferenciadas teve início no mês de fevereiro e sua diferenciação para gemas reprodutivas, em abril/maio. No final de julho, quase todas as gemas já eram reprodutivas. A porcentagem de gemas indiferenciadas no mês de fevereiro foi 50% menor em 2005, porque os ramos amostrados apresentavam um grande número de frutos na região basal, indicando que nos ramos de cafeeiro de anos de alta produção, ocorre um atraso na diferenciação das gemas florais em relação aos ramos com poucos frutos de ano de baixa produção. Os níveis intermediários de sombreamento, 50 e 70% de radiação solar, anteciparam o desenvolvimento das gemas no ano de alta produção, ocorrendo o inverso no ano de baixa produção. A radiação possui um efeito maior nas fases iniciais do desenvolvimento floral.2011-09-122017-08-01T20:08:21Z2017-08-01T20:08:21Z2011info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfVOLTAN, R. B. Q.; FAHL, J. I.; CARELLI, M. L. C. Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação. Coffee Science, Lavras, v. 6, n. 3, p. 256-268, set./dez. 2011.http://repositorio.ufla.br/jspui/handle/1/13805http://www.coffeescience.ufla.br/index.php/Coffeescience/article/view/301Coffee Science; v. 6, n. 3 (2011); 256-268Coffee Science; v. 6, n. 3 (2011); 256-268Coffee Science; v. 6, n. 3 (2011); 256-2681984-39091809-6875reponame:Repositório Institucional da UFLAinstname:Universidade Federal de Lavras (UFLA)instacron:UFLAporhttp://www.coffeescience.ufla.br/index.php/Coffeescience/article/view/301/pdfhttp://www.coffeescience.ufla.br/index.php/Coffeescience/article/downloadSuppFile/301/131http://www.coffeescience.ufla.br/index.php/Coffeescience/article/downloadSuppFile/301/132http://www.coffeescience.ufla.br/index.php/Coffeescience/article/downloadSuppFile/301/133http://www.coffeescience.ufla.br/index.php/Coffeescience/article/downloadSuppFile/301/134Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessVoltan, Rachel Benetti QueirozFahl, Joel IrineuCarelli, Maria Luíza CarvalhoVoltan, Rachel Benetti QueirozFahl, Joel IrineuCarelli, Maria Luíza Carvalho2021-03-19T16:44:45Zoai:localhost:1/13805Repositório InstitucionalPUBhttp://repositorio.ufla.br/oai/requestnivaldo@ufla.br || repositorio.biblioteca@ufla.bropendoar:2021-03-19T16:44:45Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA)false |
dc.title.none.fl_str_mv |
Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation |
title |
Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação |
spellingShingle |
Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação Voltan, Rachel Benetti Queiroz Cafeicultura Anatomia das gemas Ciências agrárias Fenologia Floração |
title_short |
Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação |
title_full |
Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação |
title_fullStr |
Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação |
title_full_unstemmed |
Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação |
title_sort |
Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação |
author |
Voltan, Rachel Benetti Queiroz |
author_facet |
Voltan, Rachel Benetti Queiroz Fahl, Joel Irineu Carelli, Maria Luíza Carvalho |
author_role |
author |
author2 |
Fahl, Joel Irineu Carelli, Maria Luíza Carvalho |
author2_role |
author author |
dc.contributor.author.fl_str_mv |
Voltan, Rachel Benetti Queiroz Fahl, Joel Irineu Carelli, Maria Luíza Carvalho Voltan, Rachel Benetti Queiroz Fahl, Joel Irineu Carelli, Maria Luíza Carvalho |
dc.subject.por.fl_str_mv |
Cafeicultura Anatomia das gemas Ciências agrárias Fenologia Floração |
topic |
Cafeicultura Anatomia das gemas Ciências agrárias Fenologia Floração |
description |
Little is known about the radiation effect on the induction and differentiation phases of reproductive nodes of Coffea arabica L. This knowledge would allow defining shading levels, or planting densities, appropriate to maximize the development, the production and the sustainability of the coffee crop. Floral differentiation was evaluated in plants of ‘Catuai Vermelho IAC 81, cultivated under four radiation regimes (30, 50, 70 and 100%), by using different plastic screens. Plagiotropic branches with fruits were collected from february to september, for two consecutive years. Slides of longitudinal sections of the node regions were mounted for the characterization and quantification of histological stages of bud differentiation. The undifferentiated buds formation began in February and, their differentiation to reproductive buds, in April/May. At the end of July practically all buds were already reproducing. The percentage of undifferentiated buds in February was 50% lower in 2005 because the sample branches had a large number of fruits in the basal region, indicating that the branches in a year of high production show a delay in flower bud differentiation in relation to the branches with few fruits during low productive years. The intermediate levels of shading, 50 to 70%, solar radiation, anticipated the development of buds from the plants grown under full sun in years of high production, the opposite occurred in the low productive years. The percentage of undifferentiated buds between irradiance treatments varied more than the percentage of reproductive buds, indicating that the radiation intensity has a greater effect in the early stages of floral differentiation. |
publishDate |
2011 |
dc.date.none.fl_str_mv |
2011-09-12 2011 2017-08-01T20:08:21Z 2017-08-01T20:08:21Z |
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 |
VOLTAN, R. B. Q.; FAHL, J. I.; CARELLI, M. L. C. Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação. Coffee Science, Lavras, v. 6, n. 3, p. 256-268, set./dez. 2011. http://repositorio.ufla.br/jspui/handle/1/13805 http://www.coffeescience.ufla.br/index.php/Coffeescience/article/view/301 |
identifier_str_mv |
VOLTAN, R. B. Q.; FAHL, J. I.; CARELLI, M. L. C. Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação. Coffee Science, Lavras, v. 6, n. 3, p. 256-268, set./dez. 2011. |
url |
http://repositorio.ufla.br/jspui/handle/1/13805 http://www.coffeescience.ufla.br/index.php/Coffeescience/article/view/301 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
http://www.coffeescience.ufla.br/index.php/Coffeescience/article/view/301/pdf http://www.coffeescience.ufla.br/index.php/Coffeescience/article/downloadSuppFile/301/131 http://www.coffeescience.ufla.br/index.php/Coffeescience/article/downloadSuppFile/301/132 http://www.coffeescience.ufla.br/index.php/Coffeescience/article/downloadSuppFile/301/133 http://www.coffeescience.ufla.br/index.php/Coffeescience/article/downloadSuppFile/301/134 |
dc.rights.driver.fl_str_mv |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf application/pdf |
dc.source.none.fl_str_mv |
Coffee Science; v. 6, n. 3 (2011); 256-268 Coffee Science; v. 6, n. 3 (2011); 256-268 Coffee Science; v. 6, n. 3 (2011); 256-268 1984-3909 1809-6875 reponame:Repositório Institucional da UFLA instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Repositório Institucional da UFLA |
collection |
Repositório Institucional da UFLA |
repository.name.fl_str_mv |
Repositório Institucional da UFLA - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
nivaldo@ufla.br || repositorio.biblioteca@ufla.br |
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1807835104239681536 |