Ineficiência do silício no controle da ferrugem do cafeeiro em solução nutritiva

Carré‐Missio, Vivian; Rodrigues, Fabrício Ávila; Schurt, Daniel Augusto; Pereira, Sandra Cerqueira; Oliveira, M. G. A.; Zambolim, Laércio

doi:10.1590/s1982-56762009000600009

Cited by 17 publications

(14 citation statements)

References 17 publications

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“…Coffee plants cannot uptake Si from roots and accumulate it in the shoots (Carré‐Missio et al , ) with great efficiency as compared to rice (Rodrigues et al , ). Coffee plants also show very low leaf Si absorption efficiency, mainly due to the quick polymerisation of PS on the leaf surface before uptake can occur (Carré‐Missio et al , ).…”

Section: Resultsmentioning

confidence: 99%

Effect of foliar‐applied potassium silicate on coffee leaf infection by Hemileia vastatrix

Carré‐Missio

Rodrigues

Schurt

et al. 2014

Annals of Applied Biology

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Coffee leaf rust, caused by Hemileia vastatrix, is the most devastating disease of coffee. Since limited information is available in the literature on silicon (Si) affecting plant diseases in coffee, this study was designed to investigate foliar application of potassium silicate (PS), a source of soluble (Si), on infection process of coffee leaf rust at the microscopic level. The foliar Si concentration for plants sprayed with water and PS has no significant difference (0.24 and 0.30 dag kg −1 , respectively). X-ray microanalysis indicated that the deposition of Si on the leaves of the plants that were sprayed with PS was greater in comparison to the leaf samples from the plants sprayed with water. Rust severity on leaves of plants sprayed with water or sprayed with PS reached 44% and 32%, respectively, at 36 days after inoculation (dai). Plates of polymerised PS were observed on the leaf surfaces of the plants sprayed with the product, in contrast to its absence on the leaf surfaces of plants sprayed with water. At 36 dai, a greater number of uredia were observed on the leaf surfaces of plants sprayed with water in comparison to the leaf surfaces of plants sprayed with PS. On fractured leaf tissues that were sprayed with PS, less fungal colonisation was observed in comparison to the leaves of plants sprayed with water. In conclusion, the results of this study suggest that the effect of foliar-applied Si on the control of the coffee leaf rust development may be attributed to the physical role of the polymerised PS, its osmotic effect against urediniospores germination, or both.

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Section: Resultsmentioning

confidence: 99%

Effect of foliar‐applied potassium silicate on coffee leaf infection by Hemileia vastatrix

Carré‐Missio

Rodrigues

Schurt

et al. 2014

Annals of Applied Biology

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“…Não houve aumento na atividade dessas enzimas em folhas de plantas que receberam aplicação foliar de Si e a redução na severidade do oídio foi atribuída à barreira física formada pela polimerização do silicato e também ao efeito osmótico (Liang et al, 2005). Carré-Missio et al (2009a) observaram que plantas de cafeeiro (cv. Catuaí 44) crescidas em solução nutritiva contendo Si não apresentaram aumento no período de incubação e no período latente da ferrugem e nem mesmo redução no número de pústulas por folha, área pustular, expansão de pústulas e área abaixo da curva do progresso da ferrugem ou aumento na atividade de quitinases, β-1,3-glucanases e peroxidases.…”

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Proteção local, não sistêmica, do silicato de potássio reduz os sintomas da ferrugem do cafeeiro

Carré‐Missio¹,

Rodrigues²,

Schurt³

et al. 2012

Trop. plant pathol.

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RESUMONo primeiro experimento, plantas de cafeeiro com três pares de folhas foram pulverizadas com silicato de potássio (K 2 SiO 3 ), epoxiconazole, acibenzolar-S-metil (ASM) e água destilada de duas maneiras: pulverização do 3º par de folhas, a partir do ápice, protegendo o 2º par de folhas ou pulverização de um par de folhas da lateral esquerda da planta e protegendo o par de folhas da lateral direita. Após 24 h, a face abaxial dos pares de folhas protegidos foi inoculada com Hemileia vastatrix. No segundo experimento, o 3º par de folhas de plantas, a partir do ápice, foi pulverizado com K 2 SiO 3 , ASM e água destilada protegendo o 2º par de folhas. Aos 1, 5, 15, 25 e 35 dias após aplicação dos produtos, a face abaxial do 2º (proteção sistêmica) e do 3º par de folhas (proteção local) de oito plantas de cada tratamento foram inoculadas com H. vastatrix. O K 2 SiO 3 pulverizado no 3º par de folhas ou em um par de folhas da lateral esquerda foi ineficiente em aumentar a concentração de silício e reduzir a intensidade da esporulação (IE), o número total de pústulas (NTP) por folha e a severidade da ferrugem no 2º par de folhas ou no par de folhas da lateral direita, ao contrário do epoxiconazole e do ASM, os quais apresentaram sistemicidade na planta. A pulverização do K 2 SiO 3 no 3º par de folhas também não garantiu, devido a sua natureza não sistêmica, redução da IE, do NTP e da severidade da ferrugem comparado com a proteção local. Os resultados desse trabalho apontam para a possibilidade de se utilizar a pulverização com silicato de potássio para reduzir a intensidade da ferrugem do cafeeiro preventivamente. Palavras-chave: Coffea arabica, Hemileia vastatrix, nutrição mineral. ABSTRACT Local protection, not systemic, of potassium silicate to decrease coffee leaf rust symptomsIn the first experiment, coffee plants with three pairs of leaves were sprayed with potassium silicate (K 2 SiO 3 ), epoxiconazole, acibenzolar-S-methyl (ASM), and distilled water in two different ways: spraying the 3 rd pair of leaves from the apex and protecting the 2 nd pair of leaves or spraying the two pair of leaves on the left side of the plant and protecting the pair of leaves on the right side. After 24 h, the abaxial surface of the protected pair of leaves was inoculated with Hemileia vastatrix. In the second experiment, the 3 rd pair of leaves from the apex was sprayed with K 2 SiO 3 , ASM, and distilled water and the 2 nd pair of leaves was protected. At 1, 5, 15, 25, and 35 days after products application, the abaxial surface of 2 nd (systemic protection) and the 3 rd pair of leaves (local protection) of eight plants per treatment were inoculated with H. vastatrix. The K 2 SiO 3 spray on the 3 rd pair of leaves or on the pair of leaves on the left side was ineffective in increasing silicon concentration and also decreasing the intensity of sporulation (IE), the total number of pustules (TNP) per leaf, and rust severity on the 2 nd pair of leaves or in the pair of leaves on the right side, unlike the epoxiconazole and the ASM...

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“…the product and was thus not efficiently translocated to the shoots. According to Carré-Missio et al (2009), coffee plants have been shown to be inefficient in uptaking Si from the nutrient solution and translocating it to the shoot because it was exclusively restricted to the roots, and no increase in resistance to rust was obtained. Conversely, for a Si-accumulator plant species, Resende et al (2013) observed that the area under anthracnose progress curve was reduced by 40% with the amendment of Si-deficient soil with calcium silicate.…”

Section: Resultsmentioning

confidence: 99%

Silicon and Triadimenol for the Management of Coffee Leaf Rust

Lopes

Zambolim

Neto

et al. 2013

Journal of Phytopathology

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This study documents an experiment that was undertaken in growing seasons on Coffea arabica cv. 'Catua ı Vermelho IAC 144' that sought to evaluate the effects of various calcium silicate rates combined with the fungicide triadimenol on the incidence of coffee leaf rust. The experimental design was a randomized complete block in a split plot with five treatments (with varied calcium silicate rates and with or without triadimenol) and four replications. Each experimental unit (split plot) consisted of seven coffee plants (14 m 2 ), which were the central five plants used for the evaluations. Calcium silicate (CS) and lime (L) were used according to the following mixtures (M): M1: 0% CS and 100% L; M2: 25% CS and 75% L; M3: 50% CS and 50% L; M4: 75% CS and 25% L; and M5: 100% CS and 0% L. The leaf Si concentration did not increase as CS rates increased in the soil. There was no reduction in the area under rust progress curve (AURPC) as the rates of CS increased in the soil. During the growing seasons incidence reached 94, 96 and 92% on plants that did not receive triadimenol, respectively, whereas the incidence did not exceed 6, 38 and 16%, respectively, for those plants that did. For yield, no interaction was observed between the calcium silicate rates and with or without triadimenol. The yield increased by 117% for plants receiving triadimenol compared with those that did not. The 3-year experiments indicated that soil amendment with calcium silicate had no effect on either reducing coffee leaf rust incidence or increasing yield. Conversely, as expected, coffee leaf rust symptoms were dramatically reduced on plants sprayed with triadimenol, and this was accompanied by a significant gain in yield.

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Ineficiência do silício no controle da ferrugem do cafeeiro em solução nutritiva

Cited by 17 publications

References 17 publications

Effect of foliar‐applied potassium silicate on coffee leaf infection by Hemileia vastatrix

Effect of foliar‐applied potassium silicate on coffee leaf infection by Hemileia vastatrix

Proteção local, não sistêmica, do silicato de potássio reduz os sintomas da ferrugem do cafeeiro

Silicon and Triadimenol for the Management of Coffee Leaf Rust

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