Foliar application of potassium silicate reduces the intensity of soybean rust

Rodrigues, Fabrício Ávila; Duarte, Henrique da Silva Silveira; Domiciano, Gisele Pereira; Souza, C. A.; Korndörfer, Gaspar Henrique; Zambolim, Laércio

doi:10.1071/ap09010

Cited by 71 publications

(58 citation statements)

References 19 publications

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“…In support of previous findings that Si can improve the resistance of several dicots against foliar pathogens (Datnoff et al, 2007;Rodrigues et al, 2009), the present study describes the first physiological and biochemical features associated with the increase in the resistance of bean plants supplied with Si against C. lindemuthianum infection. The leaf Si concentration of +Si plants (values ranging from 0.9 to up to 1.2 dag kg -1 ) is consistent with what has been reported previously for dicots, which are able to accumulate, on average, 1 dag Si kg -1 (Datnoff et al, 2007).…”

Section: Discussionsupporting

confidence: 68%

Photosynthetic gas exchange and antioxidative system in common bean plants infected by Colletotrichum lindemuthianum and supplied with silicon

Polanco

Rodrigues

Nascimento

et al. 2014

Trop. plant pathol.

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This study investigated the effects of silicon (Si) on the resistance of common bean plants to anthracnose caused by Colletotrichum lindemuthianum. The plants were grown in a nutrient solution containing 0 (control) or 2 mM Si (+Si) and both photosynthesis and antioxidative metabolism levels were evaluated. The Si concentrations in the leaf tissues of +Si plants increased by 33% in comparison to those of control plants. Anthracnose severity was reduced by 34% in +Si plants in comparison to control plants. The net carbon assimilation rate, stomatal conductance to water vapor and transpiration rate values were significantly higher in +Si plants than in control plants. The activities of superoxide dismutase (SOD), ascorbate peroxidase (APX) and glutathione reductase (GR) tended to be higher in +Si plants than in control plants. The hydrogen peroxide concentration was significantly lower in +Si plants than in control plants. In conclusion, the Si supply was associated with lower anthracnose severity and up-regulation of antioxidant enzymes, which in turn might be associated with better gas exchange in +Si plants. The impaired photosynthetic performance in +Si plants was associated with stomatal limitations, whereas in control plants those impairments likely reflected dysfunctions at the level of biochemical reactions involved in CO 2 fixation.

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Section: Discussionsupporting

confidence: 68%

Photosynthetic gas exchange and antioxidative system in common bean plants infected by Colletotrichum lindemuthianum and supplied with silicon

Polanco

Rodrigues

Nascimento

et al. 2014

Trop. plant pathol.

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“…Thus, it appears that Si, in addition to functioning as a mechanical barrier which limits pathogen penetration, is also involved in the potentiation of host resistance against fungal infection. The application of PS reduced the severity of ASR and the number of uredia per cm² of leaf area corroborating with the results obtained by Lemes et al (2011) and Rodrigues et al (2009).…”

supporting

confidence: 80%

Potassium silicate and calcium silicate on the resistance of soybean to Phakopsora pachyrhizi infection

Cruz

Rodrigues²,

Diniz³

et al. 2013

Bragantia

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The control of Asian Soybean Rust (ASR), caused by Phakopsora pachyrhizi, has been difficult due to the aggressiveness of the pathogen and the lack of resistant cultivars. The objective of this study was to evaluate the effects of spray of potassium silicate (PS) and soil amendment with calcium silicate (CS) on soybean resistance to ASR. The PS solution was sprayed to leaves 24 hours prior to fungal inoculation while CS was amended to the soil at thirty-five days before sowing. The infection process of P. pachyrhizi was investigated by scanning electron microscopy. The uredia on leaves of plants sprayed with PS were smaller and more compact than those observed on the leaves of plants grown in soil amended with CS or in soil non-amended with CS (control treatment). On leaves of plants from the control treatment, uredia produced many urediniospores at 9 days after inoculation, and the ASR severity was 15, 8 and 9%, respectively, for plants from control, PS and CS treatments. In conclusion, the spray of PS contributed to reduce the number of uredia per cm² of leaf area and both PS spray and CS resulted in lower ASR symptoms.Key words: Glycine max, biotrophic fungi, scanning electron microscopy.Silicato de potássio e silicato de cálcio na resistência da soja à infecção por Phakopsora pachyrhizi Resumo O controle da Ferrugem Asiática da Soja (FAS), causado pelo fungo Phakopsora pachyrhizi, tem sido difícil devido à agressividade do patógeno e pela falta de cultivares resistentes. O objetivo deste estudo foi avaliar os efeitos da pulverização com silicato de potássio (SP) e do suprimento de Si via silicato de cálcio (SC) no solo sobre a resistência da soja à FAS. A solução de PS foi pulverizada nas folhas 24 horas antes da inoculação, enquanto que o SC foi aplicado no solo 35 dias antes da semeadura. O processo infeccioso de P. pachyrhizi foi investigado por microscopia eletrônica de varredura. As urédias nas folhas das plantas pulverizadas com SP foram menores e mais compactas do que as observadas nas folhas das plantas cultivadas em solo contendo SC ou em solo não contendo SC (tratamento controle). Nas folhas das plantas do tratamento controle, as urédias produziram muitos uredosporos aos nove dias após inoculação e a severidade da FAS foi de 15, 8 e 9% para as plantas dos tratamentos controle, SP e SC, respectivamente. Em conclusão, a pulverização de SP contribuiu para reduzir o número de urédias cm -2 da área foliar e ambas, a pulverização com SP e a aplicação do SC, resultaram na redução dos sintomas da FAS.Palavras-chave: Glycine max, fungo biotrófico, microscopia eletrônica de varredura.

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“…A similar result was found with potassium silicate alone or mixed with mancozeb + cymoxanil on the control of late blight of potato (Duarte et al, 2008) and with "Calda Viçosa" (a mixture of copper and micronutrients) to control ramularia leaf spot on cotton (Aquino et al, 2008). On the other hand, Rodrigues et al (2009) reported decreased soybean rust severity by foliar application of potassium silicate at rates ranging from 8 to 60 g/L.…”

Section: Rust Caused By the Fungus Hemileia Vastatrixsupporting

confidence: 60%

Effect of foliar application of potassium silicate on the progress of coffee leaf rust

Lopes¹,

Zambolim²,

Neto³

et al. 2013

Trop. plant pathol.

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In order to evaluate the effect of potassium silicate spray on the control of coffee leaf rust and coffee yield, an experiment was conducted during the 2005/2006 and 2006/2007 growing seasons on Coffea arabica cv. Catuaí Vermelho IAC 144, in a location situated at an elevation of 850 m in Coimbra, Minas Gerais, Brazil. The treatments consisted of: 1 -potassium silicate; 2 -potassium silicate + copper hydroxide; 3 -copper hydroxide; 4 -epoxiconazole formulated with pyraclostrobin and 5 -control treatment. Six applications of potassium silicate and copper hydroxide were made twice per month from December to March of each year. Two applications of the systemic fungicide were done in December and March of each year. Potassium silicate alone or in combination with copper hydroxide was not efficient in reducing coffee leaf rust incidence and increasing yield under high incidence of coffee leaf rust.

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Foliar application of potassium silicate reduces the intensity of soybean rust

Cited by 71 publications

References 19 publications

Photosynthetic gas exchange and antioxidative system in common bean plants infected by Colletotrichum lindemuthianum and supplied with silicon

Photosynthetic gas exchange and antioxidative system in common bean plants infected by Colletotrichum lindemuthianum and supplied with silicon

Potassium silicate and calcium silicate on the resistance of soybean to Phakopsora pachyrhizi infection

Effect of foliar application of potassium silicate on the progress of coffee leaf rust

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