ISHS Acta Horticulturae 548: International Symposium on Growing Media and Hydroponics
EFFECTS OF SOME PLANT AND MICROBIAL METABOLITES ON GERMINATION AND EMERGENCE OF TOMATO SEEDLINGS |
| Authors: | B. Jung, B.W. Alsanius, P. Jensén |
| Keywords: | Axenic conditions, benzoic acid derivates, benzoic acid, chlorogenic acid, cinnamonic acid derivates, cultivar, ferulic acid, growth inhibition, Lycopersicon esculentum, p-hydroxybenzoic acid, salicylic acid, vanillic acid |
| Abstract:
Microbial and plant metabolites may occur in the irrigation water of closed hydroponic systems. The present study examines effects of some phenolic compounds (benzoic acid, chlorogenic acid, ferulic acid, p-hydroxy-benzoic acid, salicylic acid, vanillic acid, and 2,4-diacetyl phloroglucinol) at different concentrations (0, 1, 10, 100 and 1000 µM in the fresh nutrient solution, pH 5.50) with respect to germination, shoot and root fresh weight of tomato cvs. ‘Aromata’, ‘Armada’ and ‘Dalton’, respectively. Our results show a significant decrease in both emergence as well as root and shoot weight at external acid concentrations exceeding 10 µM. Differences in effects between the tested compounds were found. Chlorogenic acid showed the strongest phytotoxic effect in all three tested cultivars. | |
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