Plant Protect. Sci., 2002, 38(10):S141-S144 | DOI: 10.17221/10340-PPS

Resistance mechanisms in Lycopersicon spp. to tomato powdery mildew (Oidium neolycopersici)Original Paper

A. Lebeda, B. Mieslerová, L. Luhová, K. Mlíčková
1 Department of Botany and
2 Department of Biochemistry, Faculty of Science, Palacký University, 783 71 Olomouc-Holice, Czech Republic *Tel.: +420 585 223 325, Fax: +420 585 241 027, E-mail: lebeda@prfholnt.upol.cz

Limited information on the resistance mechanisms in Lycopersicon spp. to Oidium neolycopersici is still available. Macroscopically the resistance is characterized by a very low amount of mycelium development and a lack of sporulation. The leaf surface did not effectively inhibite conidium germination, however significant differences in germ tube and appressorium development were recorded. A large variation was observed in host tissue response. The prevailing resistance mechanism was hypersensitivity (HR). Considerable changes of peroxidase and catalase activities during pathogenesis were detected among tested wild Lycopersicon spp. There was positive correlation between increasing of peroxidase activity and extent of necrosis. Histochemistry showed large differences in production of superoxid ions, H2O2 and peroxidase in Lycopersicon spp. with various level of resistance.

Keywords: Oidium neolycopersici; Lycopersicon spp.; resistance mechanisms; hypersensitive response; peroxidase; catalase; reactive oxygen species

Published: June 30, 2002  Show citation

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Lebeda A, Mieslerová B, Luhová L, Mlíčková K. Resistance mechanisms in Lycopersicon spp. to tomato powdery mildew (Oidium neolycopersici). Plant Protect. Sci. 2002;38(SI 1 - 6th Conf EFPP):S141-144. doi: 10.17221/10340-PPS.
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