- ELSEVIER SCIENCE BV
To establish the use of low-pressure carbon dioxide microbubbles (MB-CO2), developed as a food sterilizing method, as a practical technique for inactivating plant pathogens in hydroponic nutrient solution, Fusarium oxysporum f. sp. melonis and Pectobacterium carotovorum subsp. carotovorum were inactivated by MB-CO2. The inorganic components in the MB-CO2-treated hydroponic nutrient solution were also analyzed, and a growth test of leaf lettuces with the MB-CO2-treated hydroponic nutrient solution was performed. Five-log reductions in F. oxysporum f. sp. melonis spores and P. carotovorum subsp. carotovorum cells were achieved by MB-CO2 treatment performed at 15 degrees C and 1,5 MPa in the mixing vessel, and at 40 degrees C or 45 degrees C and 4.0 MPa at the heating coil. No changes of the inorganic components in the MB-CO2-treated hydroponic nutrient solution were observed. Furthermore, CO2 dissolved in the hydroponic nutrient solution at high concentration by MB-CO2 treatment had little influence on the growth of leaf lettuces. MB-CO2 appears to be a promising new technique for inactivating plant pathogens in hydroponic nutrient solution. (C) 2013 Elsevier B.V. All rights reserved.
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