Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Coffee Science (Online) |
Texto Completo: | https://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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Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiationDiferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiaçãoAnatomia das gemasdesenvolvimento reprodutivofenologiafloraçãoAnatomia das gemasdesenvolvimento reprodutivofenologiafloraçãoLittle 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.Editora UFLA2011-09-12info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfimage/tiffimage/tiffimage/tiffimage/tiffhttps://coffeescience.ufla.br/index.php/Coffeescience/article/view/301Coffee Science - ISSN 1984-3909; Vol. 6 No. 3 (2011); 256-268Coffee Science; Vol. 6 Núm. 3 (2011); 256-268Coffee Science; v. 6 n. 3 (2011); 256-2681984-3909reponame:Coffee Science (Online)instname:Universidade Federal de Lavras (UFLA)instacron:UFLAporhttps://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/pdfhttps://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/1021https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/1022https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/1023https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/1024Copyright (c) 2012 Coffee Science - ISSN 1984-3909https://creativecommons.org/info:eu-repo/semantics/openAccessQueiroz-Voltan, Rachel BenettiFahl, Joel IrineuCarelli, Maria Luíza Carvalho2013-02-24T13:39:59Zoai:coffeescience.ufla.br:article/301Revistahttps://coffeescience.ufla.br/index.php/CoffeesciencePUBhttps://coffeescience.ufla.br/index.php/Coffeescience/oaicoffeescience@dag.ufla.br||coffeescience@dag.ufla.br|| alvaro-cozadi@hotmail.com1984-39091809-6875opendoar:2024-05-21T19:53:36.765150Coffee Science (Online) - Universidade Federal de Lavras (UFLA)true |
dc.title.none.fl_str_mv |
Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation Diferenciação floral em cafeeiro arábica (Coffea arabica L.) sob diferentes níveis de radiação |
title |
Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation |
spellingShingle |
Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation Queiroz-Voltan, Rachel Benetti Anatomia das gemas desenvolvimento reprodutivo fenologia floração Anatomia das gemas desenvolvimento reprodutivo fenologia floração |
title_short |
Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation |
title_full |
Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation |
title_fullStr |
Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation |
title_full_unstemmed |
Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation |
title_sort |
Floral differentiation in arabica coffee (Coffea arabica L.) under different levels of radiation |
author |
Queiroz-Voltan, Rachel Benetti |
author_facet |
Queiroz-Voltan, Rachel Benetti 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 |
Queiroz-Voltan, Rachel Benetti Fahl, Joel Irineu Carelli, Maria Luíza Carvalho |
dc.subject.por.fl_str_mv |
Anatomia das gemas desenvolvimento reprodutivo fenologia floração Anatomia das gemas desenvolvimento reprodutivo fenologia floração |
topic |
Anatomia das gemas desenvolvimento reprodutivo fenologia floração Anatomia das gemas desenvolvimento reprodutivo 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 |
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 |
https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301 |
url |
https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/pdf https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/1021 https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/1022 https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/1023 https://coffeescience.ufla.br/index.php/Coffeescience/article/view/301/1024 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2012 Coffee Science - ISSN 1984-3909 https://creativecommons.org/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2012 Coffee Science - ISSN 1984-3909 https://creativecommons.org/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf image/tiff image/tiff image/tiff image/tiff |
dc.publisher.none.fl_str_mv |
Editora UFLA |
publisher.none.fl_str_mv |
Editora UFLA |
dc.source.none.fl_str_mv |
Coffee Science - ISSN 1984-3909; Vol. 6 No. 3 (2011); 256-268 Coffee Science; Vol. 6 Núm. 3 (2011); 256-268 Coffee Science; v. 6 n. 3 (2011); 256-268 1984-3909 reponame:Coffee Science (Online) instname:Universidade Federal de Lavras (UFLA) instacron:UFLA |
instname_str |
Universidade Federal de Lavras (UFLA) |
instacron_str |
UFLA |
institution |
UFLA |
reponame_str |
Coffee Science (Online) |
collection |
Coffee Science (Online) |
repository.name.fl_str_mv |
Coffee Science (Online) - Universidade Federal de Lavras (UFLA) |
repository.mail.fl_str_mv |
coffeescience@dag.ufla.br||coffeescience@dag.ufla.br|| alvaro-cozadi@hotmail.com |
_version_ |
1799874918971604992 |