Biblioteca do Café
URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/1
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Resultados da Pesquisa
Item Spatial-temporal patterns of coffee tree physiology(Editora UFLA, 2019-07) Santini, Paula Tristão; Barbosa, Ronei Aparecido; Almeida, Lorena Gabriela; Souza, Kamila Rezende Dázio de; Barbosa, João Paulo Rodrigues Alves Delfino; Alves, José DonizetiThe ecophysiological parameters of coffee canopy were mapped throughout the day. Therefore, evaluations were carried out in ‘Catuaí Vermelho’ Coffea arabica L., measuring 1.7 meters. A vertical gradient (from the apex to the base of the plant canopy) and a horizontal gradient (plagiotropic branches) were established to analyze different positions of the canopy. Thus, in the vertical direction, four heights were analyzed in the plant: top, upper, middle and lower regions. In the horizontal gradient, the plagiotropic branches were divided into three parts: basal, median and apical. Collection was performed on the east and west sides of the canopy, at four times of the day: 6 a.m., 9 a.m., noon, and 3 p.m., totaling 24 collection points at each time. Gas exchange, photosynthetically active radiation and leaf temperature were evaluated in each of the 24 points of the coffee canopy. The gas exchange characteristics of an individual coffee leaf diverge considerably from other leaves, which require caution when scaling estimates of leaf photosynthesis at the global canopy level. The analysis of some punctual leaves does not serve to discriminate the overall dynamics of a canopy.Item Spatio-temporal variability of carbohydrate and chlorophyll content in the coffee canopy(Editora UFLA, 2019-07) Santini, Paula Tristão; Almeida, Lorena Gabriela; Souza, Kamila Rezende Dázio de; Barbosa, João Paulo Rodrigues Alves Delfino; Alves, José DonizetiThe spatial variability of the total chlorophyll content and carotenoids content, starch and soluble sugars of coffee canopy were mapped throughout the day. Therefore, evaluations were carried out in a ‘Catuaí Vermelho’ coffee plant with 1.7 meters height. A vertical gradient (from the apex to the base of the plant canopy) and a horizontal gradient (plagiotropic branches) were established to analyze different positions of the canopy. Thus, in the vertical direction, four heights were analyzed in the plant: top, upper, middle and lower regions. In the horizontal gradient, the plagiotropic branches were divided into three parts: basal, median and apical. Collection of leaf samples was performed on the east and west sides of the canopy, at 9 a.m., totaling 24 collection points at each time. Higher content of photosynthetic pigments and concentration of sugars were observed in the western face and in the inner parts of the coffee tree. The content of chloroplast pigments and sugars of an individual coffee leaf diverge considerably from other leaves, which requires caution when scaling estimates at the global canopy level. The analysis of some punctual leaves does not serve to discriminate the overall dynamics of a canopy.Item Kasugamycin influence on bacterial blight of coffee and on green coffee beans physicochemical quality(Editora UFLA, 2018-01) Barbosa, Ronei Aparecido; Santini, Paula Tristão; Guilherme, Luiz Roberto GuimarãesBrazil stands out as the world’s largest coffee exporter. However, in the cold and windy regions, such as the southern of Minas Gerais, have been undergoing attack of diseases, including the bacterial blight of coffee caused by the bacterium Pseudomonas syringae pv. garcae, which despite not having the same importance as the coffee leaf rust, is causing damages and losses to the coffee plantation. The control is mainly done through preventive measures such as installation of windbreaks. When bacterial blight of coffee is already installed, the chemical control is used with syrups of copper-based products and antibiotics. The aim of the present study was to verify the efficiency of the antibiotic kasugamycin associated with copper hydroxide in the control of bacterial blight of coffee and raw coffee beans quality. The experimental design was a randomized block with five treatments, four replicates and plots of 10 plants in the field where the treatments consisted of different concentrations of the kasugamycin: 0.0, 250, 500, 750 and 1000 mL ha-1 added with 1.0 L copper hydroxide. The percent analysis was performed on the raw beans in order to verify their physical and chemical quality. The obtained results demonstrate that the solution is efficient in the control of bacterial blight of coffee as well as in the improvement of vegetative vigor and production, but does not influence the quality of raw coffee bean.Item Padrões espaço-temporais da fisiologia da copa do cafeeiro(Universidade Federal de Lavras, 2015-07-31) Santini, Paula Tristão; Alves, José DonizetiForam mapiados os parâmetros ecofisiológicos e bioquímicos do metabolismo da copa do cafeeiro. Para isso, as avaliações foram realizadas em cafeeiro (Coffea arabica L.) da cultivar Catuaí Vermelho, medindo 1,7 metros de altura. Estabeleceu-se um gradiente vertical (do ápice das plantas até a base da saia) e um gradiente horizontal (ramos plagiotrópicos) para analisar diferentes posições da copa. Assim, no sentido vertical foram analisadas quatro alturas em uma planta: topo, superior, mediano e inferior, e, no sentido horizontal, os ramos plagiotrópicos foram subdivididos em três partes: basal, mediana e apical, sendo a parte basal aquela que recebe menor intensidade luminosa e a apical a que recebe maior. A coleta foi realizada na face leste e oeste da copa, em 4 horas do dia, sendo elas: 6, 9, 12 e 15 horas, totalizando em 24 pontos de coleta, em cada horário. Foram feitas as trocas gasosas, potencial hídrico, analises bioquímicas do teor de pigmentos cloroplastideos, carboidratos e enzimas do metabolismo antioxidante. As características de trocas gasosas de uma folha individual de café divergem consideravelmente de outras folhas, o que exige cautela ao dimensionar estimativas de fotossíntese da folha ao nível global da copa. É necessário compreender os parâmetros variáveis no interior da copa do cafeeiro, uma vez que a alteração no metabolismo varia de acordo com a profundidade e altura em uma copa. A análise de algumas folhas pontuais não servem para discriminar a dinâmica global de uma copa.