Effect of sources of silicon on the control of Fusarium oxysporum f. sp. lycopersici. in tomato.
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Effect of sources of silicon on the control of Fusarium oxysporum f. sp. lycopersici. in tomato.
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| Id. |
6170014 |
| Idioma |
PT
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| Titulo |
Effect of sources of silicon on the control of Fusarium oxysporum f. sp. lycopersici. in tomato. |
| Autor(es) |
Fernanda Carvalho de Aquino Lopes
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| Localización |
http://bibtede.ufla.br/tede//tde_busca/arquivo.php?codArquivo=158
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| Versión |
1.0 |
| Estado |
Final
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| Descripción |
One of the alternatives for the control of plant diseases is the use of silicon and this work was aimed at evaluating different sources and doses of this element for the protection of tomato against Fusarium wilt. The experiments were carried out in greenhouse and in the Laboratory of Physiopathology of UFLA. In the greenhouse test, pure silicic acid, two commercial sources of silicon (slag and termophosphate) and calcium silicate p.a were tested at 0, 1, 2 and 4g of SiO2 per dm3 of soil. For the in vitro test, doses were 0, 200, 500 and 1000g.dm-3 for the first assay and 0, 1000, 2000 and 4000g.dm-3 for the second one. An increase of the germination of tomato seeds was observed for both tested cultivars, grown in silicic acid amended soil, until the dose of 359g SiO2.dm-3 soil. Furthermore, increases in plant height and seed germination were observed in soil amended with slag doses, until those of 34.48mg.dm-3 and 37.81mg.dm-3 of Si, available in soil for cv. Bônus and 36.48mg.dm-3 and 41.50mg.dm-3 for cv. Ângela, respectively. For the in vitro assays there were no significant differences for conidium germination and fungal sporulation among tested doses and sources of silicon. All tested sources and doses increased the mycelial growth index. For the effect of media amended with silicon doses on colony diameter, all treatments fitted a square regression model and an increase was observed until doses of 1666.67g.dm-3, 2500g.dm-3, 1250g.dm-3 and 3000g.dm-3 for silicic acid, slag, calcium silicate and thermophosphate, respectively. In the in vivo assay, where silicon sources were compared, plants treated with slag displayed a lower disease severity, assuring 27.3% protection. Similarly, in the second assay, where commercial sources were tested at the above listed doses, the best results were obtained for slag treated plants, to which a linear decrease of the disease severity with dose increase was observed, reaching 33% protection for 4g of SiO2.kg-1 of the soil. Treatments with thermophosphate reached its maximum protection (16%), also at the highest dose.
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| Tipo |
PDF
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| Palabras clave |
FITOPATOLOGIA
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| Tipo de recurso |
Electronic Thesis or Dissertation
Tese ou Dissertacao Eletronica
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| Tipo de Interactividad |
Expositivo
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| Nivel de Interactividad |
muy bajo
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| Audiencia |
Estudiante
Profesor
Autor
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| Estructura |
Atomic |
| Coste |
no
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| Copyright |
sí
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| Formatos |
PDF
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| Requerimientos técnicos |
Browser: Any
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| Fecha de contribución |
21-feb-2009 |
| Contacto |
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