Pathogenic and biochemical-physiological characteristics of the bacteria group "Erwinia carotovora" of different origin. [A short version of doctoral dissertation]
1998
Jovanovic, O. (University of Belgrade, Belgrade - Zemun (Yugoslavia). Faculty of Agriculture)
The pathogenic and bacteriological properties of 27 strains were examined. These strains belong to the bacteria group "Erwinia carotovora", such as: Erwinia carotovora ssp. carotovora, Erwinia carotovora ssp. atroseptica and Erwinia chrysanthemi. The check of the pathogenic qualities was done by inoculation of 24 hosts at four different temperature (18, 24, 28 and 32 deg C), using four different concentration of bacteria suspension (10**6,10**7,10**8 and 10**9 cfu/ml). The optimum temperature for making the intensive pathogenic quality with the strains of Erwinia carotovora ssp. atroseptica is 24 deg C, of Erwinia carotovora ssp. carotovora 32 deg C for plants, slices and cauliflower's blossom and 24 deg C, for the parts of the leaves, unripe fruits and onion bulbs. For the pathogenic qualities of strains of Erwinia chrysanthemi, the optimum temperature is 32 deg C. There were obtained the most intensive pathogenic qualities using 10**9 cfu/ml conc. of bacteria suspension, conc. of 10**8 and 10**7 cfu/ml being sufficient in virulent strains. Unlike the uniformity of morphologic and cultivated qualities, the studied strains showed heterogeneous qualities in the biochemical-physiological tests. This points to the existence of new taxons as well as to intermediate (transitional) strains.
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