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The aim of the study was to investigate changes of photosynthetic efficiency, amount of photosynthetic pigments, superoxide dismutase (SOD) enzyme activity, and rate of lipid peroxidation in bean-rust interaction. The clarification of the role of the above changes involved in the defence mechanism can significantly contribute to the breeding of plant varieties with natural resistance. Consequently, the amount of chemicals used in food production can be significantly reduced. In the present study some principal physiological parameters, such as the relative chlorophyll content of the host plant, the amount of photosynthetic pigments, changes in photosynthetic efficiency, and the activity of superoxide-dismutase (SOD) in addition to rate of lipid peroxidation (LP) were measured. The experiment was conducted in a humidity tent. Significant decrease in the relative chlorophyll content and in the amount of photosynthetic pigments was measured. At both sampling times, an increase was found in superoxide-dismutase enzyme activity and in rate of lipid peroxidation due to the bean rust infection. Notably, in several cases the differences were significant. The results indicate that the above parameters have important role in the bean-rust interaction, which should be taken into consideration in resistance breeding.

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: Committee on disease resistance breeding and use of genebanks, IBPGR Secretariat, Rome & CEC Secretariat, Brussels, pp. 25-26. Kays, S. J. (1991): Postharvest physiology of perishable plant products . An AVI Book, Publ

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59 243 267 Frank-Oberspach, S.L. & Keller, B. (1997): Consequences of classical and biotechnological resistance breeding for food

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): A mikotoxinok táplálékláncból való kiiktatásának lehetőségei, a rezisztencianemesítés, a fajtaelismerés és az agrotechnika területén. (Possibilities of the elimination of mycotoxins in the field of resistance breeding, variety approval and

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