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| Araujo,Leonardo; Bispo,Wilka Messner Silva; Rios,Jonas Alberto; Fernandes,Sergio Antonio; Rodrigues,Fabrício de Ávila. |
| ABSTRACT Mango wilt, caused by Ceratocystis fimbriata, is one of the most important diseases affecting mango yields in Brazil. Information regarding the biochemical mechanisms involved in mango resistance against C. fimbriata is absent in the literature. Thus, the present study determined and quantified alkaloids and phenolics in the stem tissue of mango plants from Palmer (susceptible) and Ubá (resistant) cultivars. Furthermore, it was examined the effect of these secondary metabolites against C. fimbriata growth in vitro. The high-performance liquid chromatography revealed that the concentration of two alkaloids (theobromine and 7-methylxanthine) and six phenolic compounds (caffeic acid, p-coumaric acid, gallic acid, protocatechuic acid, catechin and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ceratocystis fimbriata; Mangifera indica; High-performance liquid chromatography; Host defense responses; Secondary metabolism in plants; Vascular pathogen. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000200199 |
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| Moreira,Wiler Ribas; Bispo,Wilka Messner da Silva; Rios,Jonas Alberto; Debona,Daniel; Nascimento,Clístenes Williams Araújo; Rodrigues,Fabrício Ávila. |
| Brown spot (BS), caused by the fungus Bipolaris oryzae, is one of the most important diseases contracted by rice. We investigated the effect of magnesium (Mg) on the development of BS, caused by Bipolaris oryzae, and the effects of disease development on the photosynthetic performance of rice (Oryza sativa L.) plants (cv. Metica-1) grown in nutrient solutions containing 0.25 or 4.0 mM of Mg. Assessments of BS severity, leaf Mg and pigment concentrations (total chlorophylls and carotenoids), were carried out at 120 h after inoculation, in addition to gas exchange parameters,. Higher leaf concentration of Mg was observed in plants supplied with 4.0 mM Mg than in those supplied with 0.25 mM. The increase in leaf Mg was accompanied by a decrease in BS... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Oryza sativa; Foliar disease; Macronutrient; Photosynthesis; Plant nutrition. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000400328 |
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| Cruz,Maria Fernanda Antunes da; Silva,Larisse Arantes Freitas; Rios,Jonas Alberto; Debona,Daniel; Rodrigues,Fabrício Ávila. |
| Considering the importance of blast, caused by Pyricularia oryzae, to reduce wheat yield, this study investigate how silicon (Si) could reduce the wheat blast symptoms in the rachis tissues using light microscopy and scanning electron microscopy. Wheat plants (cv. BR 18) were grown in hydroponic culture with either 0 (–Si) or 2 mM (+Si) of Si. Blast symptoms were very well developed on the spikes of the –Si plants, which showed intense discoloration in contrast with the spikes of the +Si plants. At 72 hours after inoculation (hai), fungal hyphae extensively colonized the epidermis and the collenchyma tissue in the radial direction in the rachis of the –Si plants. In the +Si plants, fungal hyphae colonized the epidermis and the collenchyma cells to a lesser... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Triticum aestivum L.; Blast; Host defense responses; Mineral nutrition. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052015000200207 |
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| Cacique,Isaias Severino; Bispo,Wilka Messner Silva; Araujo,Leonardo; Aucique-Pérez,Carlos Eduardo; Rios,Jonas Alberto; Silva,Leandro Castro; Rodrigues,Fabrício Ávila. |
| ABSTRACT Mango wilt, caused by the fungus Ceratocystis fimbriata, is an important disease affecting mango production. In view of the beneficial effects of potassium (K) in other profitable crops and the lack of information about the effect of macronutrients on mango wilt development, the present study aimed to evaluate how mango plants supplied with K respond physiologically when infected by C. fimbriata. Mango plants (» 3 years old) from cultivar Ubá were grown in plastic pots containing 58 mg of K·dm−3 (original K level based on the chemical analysis of the substrate) or in plastic pots with substrate amended with a solution of 0.5 M potassium chloride (KCl) to achieve the rate of 240 mg K·dm−3. Disease symptoms were more pronounced in inoculated plants... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mangifera indica; Gas exchange; Host defense; Mango wilt; Plant nutrition; Vascular disease. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000400521 |
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| Duarte,Henrique da Silva Silveira; Zambolim,Laércio; Rodrigues,Fabrício de Ávila; Rios,Jonas Alberto; Lopes,Ueder Pedro. |
| A produção da soja pode ser afetada pela ocorrência de várias doenças. Dentre estas, a ferrugem, causada pelo fungo Phakopsora pachyrhizi, tem se destacado. Atualmente, novas estratégias de controle para essa doença devem ser pesquisadas. Assim, este trabalho teve como objetivo avaliar a eficiência do silicato de potássio (KSi), acibenzolar-S-metil e fungicidas no controle da ferrugem da soja. Um experimento foi conduzido em condições de campo, em delineamento em blocos ao acaso, utilizando-se 10 tratamentos, com três repetições. Foi utilizada a cultivar 'Monarca' por ser suscetível à ferrugem. Os tratamentos utilizados foram: T1 - testemunha (pulverização com água); T2 - KSi (1,2kg ha-1); T3 - KSi (2,4kg ha-1); T4 - KSi (3,6kg ha-1); T5 - KSi (4,8kg... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phakopsora pachyrhizi; Glycine max; Nutrição mineral; Controle de doenças. |
| Ano: 2009 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782009000800001 |
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