ISHS Acta Horticulturae 338: VI International Workshop on Fireblight
IN VITRO BEHAVIOUR OF ERWINIA AMYLOVORA TOWARDS SOME NATURAL PRODUCTS SHOWING BACTERICIDAL ACTIVITY. |
| Authors: | M. Scortichini, M.P. Rossi |
| Abstract:
Essential oils and pure terpenes and terpenoids were tested for pointing out their possible bactericidal activity towards Erwinia amylovora. All of the tests were carried out in vitro, utilizing several strains of the bacterium. Different inoculum sizes, different temperatures of incubation as well as different phases of growth of the microorganism and growth media were also taken into consideration. Only origanum oil has proved bactericidal at 900 mg/l, whereas citronellol and geraniol were the most effective terpenoids. Geraniol resulted effective towards a larger number of strains, whereas citronellol exerted its bactericidal action also in the stationary-death phase of growth of the bacterium. The minimum bactericidal concentration of geraniol, against 1x105cfu/ml cells of E. amylovora, ranged from 800 to 1.700 mg/l. One strain resulted relatively resistant to terpenoids, whereas origanum oil has proved effective against it. In order to reduce the occurrence of resistance to antibiotics and/or to copper, in vivo tests with these compounds and studies concerning their possible utilization with other chemicals seem worthwhile. | |
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