אסיף מאגר המחקר החקלאי

Polyamine biosynthesis in Rhizopus-infected tomato fruits: possible interaction with ethylene

Year:

1987

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Authors :

Volume :

31

Co-Authors:

Bakanashvili, M., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Barkai-Golan, R., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel
Kopeliovitch, E., Department of Field Crops, Faculty of Agriculture, The Hebrew University of Jerusalem, Rehovot, Israel
Apelbaum, A., Department of Fruit and Vegetable Storage, Agricultural Research Organization, The Volcani Center, P.O. Box 6, Bet Dagan, 50250, Israel

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Abstract:

Polyamine metabolism was examined in Rhizopus stolonifer-infected normal tomato fruit, cv. Rutgers, and the related non-ripening mutant nor. In both normal and mutant fruit ornithine decarboxylase was the major enzyme for putrescine biosynthesis. In non-infected normal fruit, the activity of ornithine and arginine decarboxylase decreased markedly prior to ripening. Consequently, the level of putrescine, spermidine and spermine declined, reaching their lowest level at fruit maturation. An increase in the level of lysine decarboxylase activity and in cadaverine accumulation was found to coincide with the decrease in the level of the other polyamines. No changes in polyamine biosynthetic enzymes and polyamine content were observed in the mutant fruit upon maturation. Infection of both normal and mutant fruits with R. stolonifer resulted in reductions in ornithine and arginine decarboxylase activity and in polyamine content. No distinct difference was found between the infected normal and the infected non-ripening mutant fruit with respect to their polyamine metabolism, indicating that the resistance of the nor mutant fruit to fungal infection is not related to their polyamine profile. Treatment of both green normal fruit and mutant fruit with ethylene resulted in decreases in ornithine and arginine decarboxylase and in polyamine content similar to those recorded upon fungal infection or during ripening of the normal fruit. Treatment of infected normal and mutant fruits with ethylene did not show any additional effects. The results presented in this study suggest that the ethylene induced by pathogen infection is responsible for the altered polyamine content of the Rhizopus-infected tomato fruits. © 1987.

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