ISHS Acta Horticulturae 396: Hydroponics and Transplant Production
EFFECTS OF SAPROPHYTIC BACTERIA IN THE CLOSED HYDROPONIC CULTURE OF GREENHOUSE CROPS |
| Authors: | P. Sundin, B. Waechter-Kristensen, P. Jensén |
| Keywords: | Phenolic acids, Degradation, Bacteria, Tomato, Lycopersicon esculentum, Growth effects |
| Abstract:
Bacteria isolated from closed, hydroponic greenhouse cultures of tomato, using media amended with 1.0 μM of caffeic acid, caused varying degrees of degradation of a mixture of 50 μM each of p-hydroxybenzoic, vanillic and caffeic acids over 72 h, but no degradation of the corresponding mixture of vanillic, p-coumaric and ferulic acid. Unfiltered and sterile filtered irrigation water from a closed hydroponic tomato culture reduced the concentration of mixtures of 50 μM each of p-hydroxybenzoic, vanillic and caffeic acids, or p-hydroxybenzoic, vanillic and ferulic acids over 24 h. It was concluded that both microbial and root cells, and free enzymes were active in the process. The isolated bacteria had no adverse effects on growth of the tomato seedlings. | |
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