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| Abreu,José Renato de; Paiva,Luciano Vilela; Rodríguez,Miguel Angel Dita; Silva,Anderson Tadeu; Henriques,Ariadne Ribeiro; Chalfun-Junior,Antonio. |
| Brazil is the largest citrus producer in the world, being responsible for more than 20% of its production, which is, however still low due to phytosanitary issues such as citrus blight. Citrus blight is an anomaly whose causes still have not yet been determined, therefore there are no efficient control measures to minimize the production losses with the use of resistant varieties being considered the most appropriate method. However, little is known about the genes involved in the defense response of the plants to this anomaly. Considering that many physiological alterations associated with plant stress responses are controlled at a transcriptional level, in this study we sought the identification and characterization of the gene expression products... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Differential gene expression; Subtractive hybridization; RT-qPCR. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542015000100032 |
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| Abreu,José Renato de; Santos,Custódio Donizete dos; Abreu,Celeste Maria Patto de; Corrêa,Angelita Duarte; Lima,Luiz Carlos de Oliveira. |
| Guava is one of the most complete and balanced fruits in in terms of s nutritional value. Highly perishable, due to its intense metabolism during ripening, its shelf life can reach 3 to 5 days under room temperature. The firmness of the green and mature fruits is due mainly to the pectin polymers. The loss of firmness during the guava ripening is due to hydrolytic enzyme activity, which promotes intense solubilization of the cell wall pectins. Given the above, with the purpose of trying to explain the rapid firmness decrease, the centesimal composition and sugar fraction of the guava fruit were determined during ripening at room temperature. The guavas were picked at the half-mature stage and stored for 8 days at 22 ± 1 ºC and 78 ± 1% relative humidity.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Guava; Sugar; Pectin. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000100023 |
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| Abreu,José Renato de; Santos,Custódio Donizete dos; Abreu,Celeste Maria Patto de; Castro,Evaristo Mauro de. |
| Guava (Psidium guajava L.) is a highly perishable fruit due to its intense metabolism during ripening. Information on the enzyme activities that degrade pectic substances, as well as the amount of pectin, is very contradictory and not clearly defined. Thus, this study aimed to monitor the changes occurred in the fruit during ripening through histochemical, physical, and scanning microscopy processes. Guavas were picked at the half-mature stage and stored for 9 days at 22 ± 1 °C and 78 ± 1% RH. The analyses conducted on the day of harvest (0) and each day of storage (1, 2, 3, 4, 5, 6, 7, and 8 days) were: firmness and histochemical analyses (ferric chloride, lugol, comassie blue, vanillin hydrochloric, and ruthenium red) observed under an optic microscope... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Pectin; Firmness; Psidium guajava L. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000100027 |
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| Wobeto,Carmen; Corrêa,Angelita Duarte; Abreu,Celeste Maria Pato de; Santos,Custódio Donizete dos; Abreu,José Renato de. |
| The high number of cassava cultivars adapted to many different regions provides a wide variation in the chemical composition of cassava leaves meal (CLM). Therefore, the contents of some nutrients in CLM from five cultivars at three ages of the plant were investigated in order to select the cultivars and ages with superior levels of these nutrients. When the plants were 12 months old, the highest levels of crude protein (CP), beta-carotene, iron, magnesium, phosphorus and sulfur were observed. The IAC 289-70 cv. showed the highest levels of magnesium, as well as considerable contents of CP, beta-carotene, iron, zinc and sulfur, which did not differ statistically from the cultivars showing the highest levels of these nutrients. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cassava leaves; Cultivar; Minerals; Vitamin; Crude protein. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612006000400024 |
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| Abreu,José Renato de; Santos,Custódio Donizete dos; Abreu,Celeste Maria Patto de; Pinheiro,Ana Carla Marques; Corrêa,Angelita Duarte. |
| Guava is a fruit with high respiration rates and a very short shelf life. Since information on its respiration pattern is contradictory, the objective was to study the changes occurring in the fruit during ripening and to relate them to the respiration behavior of this fruit. Guavas were picked at the half-ripe stage and stored for 8 days at 22 ± 1 ºC and 78 ± 1% relative humidity. The analyses conducted were: peel and pulp coloration, firmness, total soluble solids (TSS), total titratable acidity (TTA), and ethylene production. According to the results, it was verified that the parameters analyzed apparently do not coincide and are ethylene-independent. There was an accentuated ethylene production during ripening, starting from the 4th day. The ethylene... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Psidium guajav; Ripening; Ethylene. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612012000200021 |
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