Tropical Plant Pathology (2013) 38, 436-442

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Camila Cristina Lage Andrade, Renata Sousa Resende, Fabrício Ávila Rodrigues, Hélvio Gledson Maciel Ferraz, Wiler Ribas Moreira, José Rogério Oliveira and Rosa Lima Ramos Mariano (2013)
Silicon reduces bacterial speck development on tomato leaves
Tropical Plant Pathology 38 (5), 436-442
Abstract: This study aimed to evaluate the effect of silicon (Si) on the resistance of tomato plants (cv. Santa Clara) to bacterial speck, caused by Pseudomonas syringae pv. tomato (Pst). Tomatoes were grown in soil without calcium silicate (control), in soil without calcium silicate and sprayed with Supa Sílica® (2 mL/L) (SS) and in soil with calcium silicate (0.16 g/kg of soil) (CS). The effect of SS on the growth of Pst was evaluated in vitro. There was no significant difference among the treatments for foliar Si concentration and incubation period. No significant differences were observed between the control and CS for the number of lesions per plant (NLP) and bacterial speck severity estimated by the software QUANT. The NLP was significantly reduced with SS spray. There was a negative linear response of in vitro Pst growth to the SS rates. Peroxidase, polyphenoloxidase and glucanase activities were significantly higher for plants sprayed with SS and grown in soil with CS compared to the control treatment. Phenylalanine ammonia-lyase and lypoxygenase activities were significantly higher for plants grown in soil with CS compared to the control. The concentration of malondialdehyde was significantly higher for plants sprayed with SS compared to the control at 0 and 7 dai. The results of this study indicate that the symptoms of bacterial speck are reduced when plants are sprayed with SS, which can be linked to the direct effect of this product against Pst rather than the potentation of host defense responses.
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Full text of article
Database assignments for author(s): Rosa de Lima R. Mariano, Fabrício A. Rodrigues

Research topic(s) for pests/diseases/weeds:
control - general

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Pseudomonas syringae pv. tomato Tomato (Solanum lycopersicum)
Pseudomonas syringae
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