SciELO - Scientific Electronic Library Online

 
vol.33 issue6Pathogenic and molecular characterization of Plasmodiophora brassicaeVariability of Myrothecium roridum isolates from cultivated melon in the State of Rio Grande do Norte, Brazil author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Tropical Plant Pathology

On-line version ISSN 1983-2052

Abstract

AMARAL, Daniel R. et al. Potassium silicate in the induction of resistance in coffee seedlings against Cercospora coffeicola. Trop. plant pathol. [online]. 2008, vol.33, n.6, pp. 425-431. ISSN 1983-2052.  http://dx.doi.org/10.1590/S1982-56762008000600004.

The objective of this work was to study the effect of potassium silicate doses in greenhouse and field conditions, for the protection of coffee seedlings against Cercospora coffeicola, and to evaluate the effect of potassium silicate on the activities of peroxidase, polyphenoloxidase and on the content of lignin, carotenoids and chlorophyll a and b. Potassium silicate was tested in greenhouse at doses 0.75, 1.5, 3.0 and 6.0 mL/L of water. In these conditions, the dose of 1.5 mL/L provided greater protection against brown eye spot on coffee seedlings, this dose having been chosen for the field trial and biochemical determinations. In the field, potassium silicate provided protection of 31% in relation to the control, while the fungicide mixture of the epoxiconazole + pyraclostrobin provided 61% of protection. Part of this protection conferred by potassium silicate can be explained by the increase in the activities of peroxidases, polifenoloxidases and the higher accumulation of lignin.

Keywords : Coffea arabica; silicon; lignin; disease management.

        · abstract in Portuguese     · text in Portuguese     · pdf in Portuguese