Production of phytoalexins, glycoalkaloids and phenolics in leaves and tubers of potato cultivars with different degrees of field resistance after infection withPhytophthora infestans |
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Authors: | Adriana Andreu Claudia Oliva Sonia Distel G Daleo |
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Institution: | (1) Instituto de Investigaciones Biológicas, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Mar del Plata, C.C. 1245, 7600 Mar del Plata, Argentina;(2) Departamento de Agronomia, Instituto Nacional de Tecnología Agropecuaria (INTA), C.C. 276, 7620 Balcarce, Argentina |
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Abstract: | Summary The kinetics of accumulation of phytoalexins, glycoalkaloids and phenolics was studied in two potato cultivars differing in
their degrees of field resistance when infected withPhytophthora infestans. Tuber slices and leaves of cvs Pampeana INTA (high degree of field resistance, free of R genes) and Bintje (susceptible)
were infected with race C (complex race 1, 3, 5, 7, 11) ofPhytophthora infestans. Phytoalexins and phenolics accumulated in tuber and leaf tissues which had been inoculated. The levels of these compounds
in the susceptible cv. Bintje were relatively low and similar to those found before inoculation. Leaves of cv. Pampeana INTA
had a very high glycoalkaloid content, suggesting that glycoalkaloids may play a role in protection of leaves against the
fungus. However, we could find no correlation between resistance and glycoalkaloid content of tubers. Our results suggest
a major role of phytoalexins, phenolics and glycoalkaloids in the complex mechanisms of field resistance. |
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Keywords: | potato blight pathogen defence Solanum tuberosum L |
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