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Applied and Environmental Microbiology, October 2001, p. 4520-4530, Vol. 67, No. 10
INRA, UMR A408 INRA-Université d'Avignon, Domaine St
Paul, Site Agroparc,1 and INRA, Station
de Pathologie Végétale, Domaine St
Maurice,4 84914 Avignon Cedex 9, CEA/Cadarache, DSV-DEVM, Laboratoire d'Ecologie Microbienne de
la Rhizosphère, UMR 163 CNRS-CEA, 13108 Saint-Paul-Lez-Durance
Cedex,2 and Laboratoire d'Ecologie
Microbienne du Sol, UMR 6000 CNRS and DTAMB, Université Claude
Bernard Lyon I, F-69622 Villeurbanne Cedex,3
France
Received 12 February 2001/Accepted 16 July 2001
One hundred nineteen isolates from a commercial zucchini
purée stored at 4, 10, and 20 to 25°C were fingerprinted using
repetitive sequence-based PCR (REP-PCR) and classified into 35 REP types. One representative isolate of each REP type was subsequently
identified by API50CHB/20E profile and partial rrs gene
sequence analysis. Nine REP types were misidentified by the API system.
Strains were misidentified as being in the Bacillus
circulans (group 2) API taxon or in taxa with a low number of
positive API characters such as Brevibacillus brevis. A
phylogenetic analysis pointed to one new species of
Bacillus and three new species of
Paenibacillus among the misidentified REP types.
Bacterial components in zucchini purée were compared
phenotypically with those obtained in previous work on broccoli,
carrot, leek, potato, and split pea purées, based on simple
matching coefficient and unweighted pair group method with averages
cluster analysis. Out of 254 strains, 69 strains previously identified
as B. circulans (group 2) or B. circulans/B.
macerans/B. polymyxa were assigned to a new
Paenibacillus taxon phylogenetically related to
P. azotofixans. Storage conditions at 4°C favored the
development of "B. macroides/B. maroccanus" and Paenibacillus spp. in zucchini purées and
Paenibacillus spp. in other purées. Storage
conditions at 20 to 25°C favored the development of B.
subtilis group (B. licheniformis and B.
subtilis) and B. cereus group strains. At
10°C, Paenibacillus spp. were always present at high
frequencies, whereas the occurrence of B. macroides/B.
maroccanus (in zucchini purées), B.
cereus, and B. pumilus varied with the experiment.
0099-2240/01/$04.00+0 DOI: 10.1128/AEM.67.10.4520-4530.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Identification of Bacteria in Pasteurized Zucchini
Purées Stored at Different Temperatures and Comparison with Those
Found in Other Pasteurized Vegetable Purées
*
Corresponding author. Mailing address: INRA, UMR A408
INRA-Université d'Avignon, Domaine St Paul, Site Agroparc, 84914 Avignon Cedex 9, France. Phone: (33) 4 32 72 25 24. Fax: (33) 4 32 72 24 92. E-mail: guinebre{at}avignon.inra.fr.
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