Genetic diversity and involvement in bread spoilage of Bacillus strains isolated from flour and ropy bread.
OBJECTIVE
To study Bacillus contamination of wheat flour and ropy bread, to analyse genetic diversity of isolated strains and to evaluate the ability of these strains to produce ropy bread.


RESULTS
Classical and molecular methods [16S rDNA sequencing and random amplified polymorphic DNA (RAPD)-PCR] were used to identify and type-isolated strains. The predominant species isolated were Bacillus subtilis and B. licheniformis. RAPD analysis demonstrated that the same sample may harbor different strains. Ten of 15 strains of B. subtilis and four of six strains of B. licheniformis were able to cause rope spoilage of the laboratory-baked bread.


CONCLUSIONS
RAPD typing can be useful in the tracking of Bacillus strains during bakery processing and in the understanding of the role of different Bacillus strains in the rope spoilage of bread.


CONCLUSIONS
The results indicate the variability of Bacillus strains isolated from flour and responsible for rope spoilage of bread.
Sorokulova
I B
IB
Laboratoire de Microbiologie, Ecole Nationale d'Ingénieurs de Techniques Agricoles (ENITA) de Bordeaux, Gradignan, France.
Reva
O N
ON
Smirnov
V V
VV
Pinchuk
I V
IV
Lapa
S V
SV
Urdaci
M C
MC
D001407:Bacillus / Q000235:genetics* / Q000302:isolation & purification*; D001412:Bacillus subtilis / Q000235:genetics / Q000302:isolation & purification; D001939:Bread / Q000382:microbiology* / Q000592:standards; D015169:Colony Count, Microbial; D004269:DNA, Bacterial / Q000235:genetics; D004275:DNA, Ribosomal / Q000235:genetics; D005433:Flour / Q000382:microbiology* / Q000592:standards; D014644:Genetic Variation; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D019105:Random Amplified Polymorphic DNA Technique
D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S