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| Registros recuperados: 24 | |
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| STEPHANO FILHO, R.; PEREIRA, C. C.; COELHO, S. V. B.; ROSA, S. D. V. F. da; SOUZA, L. N. C. de; COELHO, L. F. S.. |
| Operações pós-colheita como beneficiamento, armazenamento e secagem podem causar danos às sementes influenciando a qualidade fisiológica. Em pesquisas recentes, tem sido confirmado que o endosperma é mais sensível ao processo de deterioração do que o embrião, sendo que este pode germinar e gerar uma plântula normal, quando isolado de uma semente deteriorada. O uso de antioxidantes pode melhorar o desempenho de sementes submetidas a estresses pela remoção de radicais livres presentes nas sementes deterioradas. Dessa forma o objetivo neste trabalho foi avaliar tratamentos antioxidantes em sementes inteiras e em sementes com parte do endosperma removido. |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Água catódica; Ácido ascórbico; Qualidade fisiológica. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1065780 |
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| VILELA, A. L. O.; ROSA, S. D. V. F. da; COELHO, S. V. B.; PEREIRA, C. C.; SOUZA, A. C. de; RIBEIRO, F. A. S.. |
| Coffee seeds rapidly lose viability during storage, which hinders the development of vigorous seedlings for crop establishment. There are reports that seed endosperm is more sensitive to deterioration than embryos, which can be excised and cultivated in vitro. However, a substantial number of plants grown in vitro do not survive during transfer to a greenhouse or field environment. The objective of this study was to evaluate the acclimatization of coffee seedlings of cultivar Catuaí Amarelo IAC 62, developed from zygotic embryos obtained from aged seeds in different substrates and environments, for the production of well-developed seedlings suitable for planting. For this purpose, seedlings were obtained from the in vitro cultivation of embryos obtained... |
| Tipo: Artigo de periódico |
Palavras-chave: Zygotic embryos; Coffea arabica var. arabica; Seedlings; Seeds. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1148763 |
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| VILELA, A. L. O.; ROSA, S. D. V. F. da; COELHO, S. V. B.; PEREIRA, C. C.; SOUZA, A. C. de; RIBEIRO, F. A. S.. |
| Coffee seeds rapidly lose viability during storage, which hinders the development of vigorous seedlings for crop establishment. There are reports that seed endosperm is more sensitive to deterioration than embryos, which can be excised and cultivated in vitro. However, a substantial number of plants grown in vitro do not survive during transfer to a greenhouse or field environment. The objective of this study was to evaluate the acclimatization of coffee seedlings of cultivar Catuaí Amarelo IAC 62, developed from zygotic embryos obtained from aged seeds in different substrates and environments, for the production of well-developed seedlings suitable for planting. For this purpose, seedlings were obtained from the in vitro cultivation of embryos obtained... |
| Tipo: Artigo de periódico |
Palavras-chave: Coffea arabica var. arabica; In vitro culture; Greenhouses; Enzyme substrates. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1150877 |
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| COELHO, S. V. B.; FIGUEIREDO, M. A. de; CLEMENTE, A. da C. S.; COELHO, L. F. S.; ROSA, S. D. V. F. da. |
| O objetivo deste trabalho foi avaliar alterações fisiológicas e bioquímicas em sementes de café submetidas à secagem rápida, em sílica gel, e à secagem lenta, em soluções salinas saturadas. As sementes foram secas até que atingissem os seguintes teores de água: 40, 30, 20, 15, 10 e 5% (base úmida). Após a secagem, uma parte das sementes foi imediatamente avaliada quanto ao desempenho fisiológico e ao perfil de enzimas do processo oxidativo, e outra parte foi avaliada após armazenagem em condição hermética, em câmara fria e seca, por quatro meses. A velocidade de secagem e o teor final de água tiveram efeito significativo sobre a qualidade fisiológica das sementes. Após a secagem rápida em sílica gel, as sementes toleraram teores finais de água mais baixos.... |
| Tipo: Artigo de periódico |
Palavras-chave: Pefil enzimático; Qualidade fisiológica; Velocidade de secagem; Coffea arabica; Armazenamento; Secagem. |
| Ano: 2015 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1020245 |
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| VILELA, A. L. O.; ROSA, S. D. V. F. da; COELHO, S. V. B.; FÁVARIS, N. A. B.; FANTAZZINI, T. B.; BAUTE, J. L.. |
| Seed deterioration induces the formation of free radicals and proliferation of microorganisms, but the application of external antioxidants may lessen these effects. The aim of this study was to investigate the antioxidant and antimicrobial activity of cathode and anode water on the physiological quality and health of Coffea arabica L. seeds. Part of the seeds were soaked in cathode water and the other part in anode water for periods of 1, 6, 12, 24, and 36 hours. The physiological quality of the seeds was evaluated by the germination test and tetrazolium test, and seed health by the Blotter test. Analysis of variance and Pearson correlation analysis were performed on the data for all the response variables. Soaking in cathode water or anode water up to 24... |
| Tipo: Artigo de periódico |
Palavras-chave: Antioxidante; Fungicida; Função Fisiológica; Qualidade; Antioxidant activity; Seed quality; Microorganisms; Coffea arabica var. arabica. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1132330 |
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| FANTAZZINI, T. B.; ROSA, S. D. V. F. da; COELHO, S. V. B.; SOUSA, P. H. A.; PEREIRA, D. de S.; VILELA, A. L. de O.; RIBEIRO, F. A. S.. |
| For sale or use of coffee seeds after harvest, the coffee grower must have information regarding their initial quality, which must meet the standards established in the Sistema Nacional de Sementes e Mudas (SNSM). However, slow germination of coffee seeds makes it difficult to obtain results from evaluation of the seed physiological quality. An alternative for quick evaluation of coffee seed viability is the tetrazolium test. However, there are still questions regarding the true potential of the test for estimating the quality of seed lots with different levels of quality. The aim of this study was to eval-uate the applicability of the tetrazolium test in estimating the viability of coffee seeds with different types of stress and levels of quality. Seeds... |
| Tipo: Artigo de periódico |
Palavras-chave: Seed germination; Quality control; Coffea arabica var. arabica. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1150878 |
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| RICALDONI, M. A.; ROSA, S. D. V. F. da; CARVALHO, M. A. de F.; FIGUEIREDO, M. A. de; COELHO, S. V. B.; BAUTE, J. L.; FANTAZZINI, T. B.. |
| Para viabilizar a produção de sementes e mudas em épocas mais favoráveis, atendendo às necessidades dos produtores, é importante que a viabilidade das sementes de café seja mantida ao longo do armazenamento. Uma alternativa viável para a conservação de sementes de espécies recalcitrantes ou intermediárias, como as sementes de coffea SP, é a criopreservação (Chen 2011). Por meio de estudos prévios, constatou-se que o teor de água de 17% (bu) permite maior sobrevivência de sementes de Coffea arabica L. à imersão direta em nitrogênio líquido (Coelho et al., 2017; Figueiredo et al., 2017). Diante disso, objetivou-se com este trabalho estudar o desenvolvimento de mudas de café com o uso de sementes de Coffea arabica L. armazenadas em câmara fria ou em... |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Produção de Sementes; Muda; Coffea Arábica. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1124827 |
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| FANTAZZINI, T. B.; ROSA, S. D. V. F. da; CARVALHO, G. R.; LISKA, G. R.; CARVALHO, M. L. M. de; COELHO, S. V. B.; CIRILLO, M. A.; RIBEIRO, F. A. S.. |
| In the Brazilian National System of Seeds and Seedlings, coffee seeds are evaluated by the germination or tetrazolium test. However, differences have been observed between the results of these tests in various studies, especially when the seeds have a lower level of quality. Given this situation, the aim of this study was to evaluate the correlation between historical data of results of the germination test and of the tetrazolium test in samples of coffee seeds using Generalized Additive Models for Location, Scale and Shape (GAMLSS). Historical data of results of the germination test and of the tetrazolium test of coffee seeds originating from different cultivars and different crop seasons were used. The zero-or-one inflated beta GAMLSS is suitable for... |
| Tipo: Artigo de periódico |
Palavras-chave: Germinação; Teste de Sementes; Café. |
| Ano: 2020 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1122355 |
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| COELHO, S. V. B.; ROSA, S. D. V. F. da; FANTAZZINI, T. B.; BAUTE, J. L.; SILVA, L. C.. |
| Coffee is one of the main agricultural commodities in the country, and it is important to conservation of plant material for breeding programs. Cryopreservation is a promising alternative for preserving in the long-term the germplasm of species considered recalcitrant. However, studies should be performed to achieve maximum survival of seedlings after immersion in liquid nitrogen. The objective of this work was to find a cryopreservation protocol for storing seeds of Coffea canephora, studying two methods of cryopreservation, slow and fast cooling. Seeds were subjected to drying in silica gel up to the water content of 0.25 g g-1. In the first experiment, dried seeds were subjected to treatments of slow cooling at speeds of -1 ºC min-1,-3 ºC min-1 and -5... |
| Tipo: Artigo de periódico |
Palavras-chave: Drying in silica gel; Ice crystals; Isoenzymes; Physiological quality; Secagem em sílica gel; Semente recalcitrante; Cristal de gelo; Qualidade fisiológica; Secagem; Isoenzima; Recalcitrant seeds. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1108759 |
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| CARVALHO, M. H. de; ROSA, S. D. V. F. da; COELHO, S. V. B.; GUIMARÃES, C. C.; MARTINS, R. de S.; CLEMENTE, A. da C. S.; PAIVA, L. V.. |
| The reduced longevity of coffee seeds has been attributed to their sensitivity to desiccation. Studies related to gene expression and enzyme activity in coffee seeds under drying are important for understanding the effects of drying on their physiological quality. The aim of this study was to investigate the molecular aspects of seeds under different drying methods and associate them with physiological quality. Coffee seeds with different water contents were dried both slowly and rapidly. Enzymatic activity was analysed, as well as the expression of genes that encode the enzymes superoxide dismutase, catalase, peroxiredoxins, isocitrate lyase, and endo-ß-mannanase. There was a significant effect of drying speed and final water content on enzyme activity... |
| Tipo: Artigo de periódico |
Palavras-chave: Drying; Coffea arabica var. arabica; Enzyme activity; Oxidative stress. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1148771 |
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| FIGUEIREDO, M. A. de; COELHO, S. V. B.; ROSA, S. D. V. F. da; VILELA, A. L.; SILVA, L. C.. |
| Cryopreservation is a viable option for conservation of coffee germplasm. However, for this technique to be completely successful, it is of fundamental importance to carry out studies that ensure maintenance of cell integrity before and after immersion in liquid nitrogen (LN). Therefore, the aim in this study was to investigate the water content, cooling rate, and final temperature most suitable for cryopreservation of Coffea arabica L. seeds. The seeds were dried by silica gel to water contents of 5, 10, 15, 20, 30 and 40 % wb, subjected to slow cooling treatments at speeds of -1, -3 and -5 °C min.-1 to final temperatures of -40, -50 and -60 °C and then directly immersed in LN. After storage, seeds were rewarmed at 40 °C for two minutes. The survival rate... |
| Tipo: Artigo de periódico |
Palavras-chave: Coffee; Slow cooling; Liquid nitrogen; Teor de água; Resfriamento lento; Nitrogênio líquido.; Café; Water content; Silica gel.. |
| Ano: 2017 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1081992 |
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| SANTOS, F. C. dos; ROSA, S. D. V. F. da; COELHO, S. V. B.; CLEMENTE, A. C. S.; FANTAZZINI, T. B.; PEREIRA, C. C.; CAIXETA, F.; FÁVARIS, N. A. B.; BAÚTE, J. L.. |
| During maturation in seeds, metabolic processes dependent on gene expression are controlled by hormones, including abscisic acid and gibberellin. These hormones determine dormancy or the capacity for germination in seeds and may have different expression levels in the endosperm and embryo of coffee seeds. We quantified gene expression in the biosynthetic pathway of gibberellin and abscisic acid in different parts of Coffea arabica L. seeds in pre and post physiological maturity, in order to better understand the germination mechanisms of this species. Coffee fruits were harvested at green, yellowish-green, cherry, over-ripe and dry stages. For studies of gene expression, intact seeds were used in addition to endosperm and isolated embryos. The RNA from... |
| Tipo: Artigo de periódico |
Palavras-chave: QRT-PCR; Coffea Arábica; Gibberellic acid; Abscisic acid. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1114204 |
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| LOUSADO, A. V. C.; COELHO, S. V. B.; ROSA, S. D. V. F. da; OLIVEIRA, R. M. E. de O.; STÉPHANO FILHO, R.; PEREIRA, C. C.. |
| Sementes de café (Coffea arabica L.) são classificadas como intermediárias em relação à tolerância à dessecação, são sensíveis à desidratação até certo grau de umidade, e tem sua armazenabilidade reduzida, o que tem sido um desafio para os produtores de sementes e programas de melhoramento. Análises ultraestruturais das membranas e da parede celular do endosperma e embrião podem contribuir para a compreensão dos processos de perda de qualidade durante a secagem e armazenamento das sementes de café. Assim, objetivou-se neste trabalho analisar as alterações ultraestruturais em sementes de café secadas até diferentes teores de água. Foram utilizadas sementes da safra 2012/2013, da espécie Coffea arabica L., cultivar Catuaí Amarelo IAC 62. As sementes foram... |
| Tipo: Anais e Proceedings de eventos |
Palavras-chave: Coffea arabica L; Análise ultraestrutural.; Silica gel.. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1065702 |
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| FIGUEIREDO, M. A. de; ROSA, S. D. V. F. da; RICALDONI, M. A.; PEREIRA, C. C.; COELHO, S. V. B.. |
| Cryopreservation is a technique that may potentially conserve the germplasm of species of the Coffea genus for an indeterminate time. The aim of this study was to evaluate the physiological, biochemical and ultrastructural characteristics of cryopreserved seeds of Coffea arabica L., cultivar Catucaí amarelo IAC 62, which was subjected to different protocols regarding dehydration, precooling, cooling, rewarming and cathode water use. According to each protocol, the seeds were subjected to fast or slow drying to moisture contents of 17 or 20% (wet basis), cooled in different ways, and then immersed in liquid nitrogen for 24 hours. Different rewarming times in a water bath were also used. Physiological, biochemical and ultrastructural analyses were performed... |
| Tipo: Artigo de periódico |
Palavras-chave: Fisiologia; Bioquímica Vegetal; Desidratação; Conservação; Resfriamento; Semente; Coffea Arábica; Cryopreservation; Germplasm conservation; Seeds; Coffea arabica var. arabica. |
| Ano: 2021 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1131310 |
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| FÁVARIS, N. A. B.; ROSA, S. D. V. F. da; FIGUEIREDO, M. A. de; COELHO, S. V. B.; VILELA, A. L. de O.; PADILHA, L.. |
| Coffee seeds are sensitive to desiccation and are used or stored with different moisture content values, which may affect the results of quality assessment. The aim of this study was to evaluate the changes in protein profile in electrophoresis gel in coffee seeds with different moisture content values under freeze-drying and without freeze-drying. Two lots of arabica coffee seeds were used, one of newly-harvested seeds and another of stored seeds. The seeds were dried to the moisture content values of 12, 15, 20, 25, 30, 35, and 40%. The physiological quality of the seeds was assessed through the germination test, electrical conductivity, and the profiles of the enzymes SOD, CAT, PO, GOT, MDH, and EST and of heat-resistant proteins. In general, there is... |
| Tipo: Artigo de periódico |
Palavras-chave: Coffea Arábica; Enzymes; Seeds; Freeze drying. |
| Ano: 2022 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1150809 |
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| Registros recuperados: 24 | |
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