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Applied and Environmental Microbiology, September 1998, p. 3220-3224, Vol. 64, No. 9
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Comparative Study of Pressure-Induced Germination of Bacillus subtilis Spores at Low and High Pressures

Elke Y. Wuytack, Steven Boven, and Chris W. Michiels*

Laboratory of Food Microbiology, Katholieke Universiteit Leuven, Leuven, Belgium

Received 13 May 1998/Accepted 2 July 1998

We have studied pressure-induced germination of Bacillus subtilis spores at moderate (100 MPa) and high (500 to 600 MPa) pressures. Although we found comparable germination efficiencies under both conditions by using heat sensitivity as a criterion for germination, the sensitivity of pressure-germinated spores to some other agents was found to depend on the pressure used. Spores germinated at 100 MPa were more sensitive to pressure (>200 MPa), UV light, and hydrogen peroxide than were those germinated at 600 MPa. Since small, acid-soluble proteins (SASPs) and dipicolinic acid (DPA) are known to be involved in spore resistance to UV light and hydrogen peroxide, we studied the fate of these compounds during pressure germination. DPA was released upon both low- and high-pressure germination, but SASP degradation, which normally accompanies nutrient-induced germination, occurred upon low-pressure germination but not upon high-pressure germination. These results adequately explain the UV and hydrogen peroxide resistance of spores germinated at 600 MPa. The resistance to pressure inactivation of 600-MPa-germinated spores could also, at least partly, be attributed to alpha /beta -type SASPs, since mutants deficient in alpha /beta -type SASPs were more sensitive to inactivation at 600 MPa. Further, germination at 100 MPa resulted in rapid ATP generation, as is the case in nutrient-induced germination, but no ATP was formed during germination at 600 MPa. These results suggest that spore germination can be initiated by low- and high-pressure treatments but is arrested at an early stage in the latter case. The implications for the use of high pressure as a preservation treatment are discussed.


* Corresponding author. Mailing address: Laboratory of Food Microbiology, Kard. Mercierlaan 92, B-3001 Heverlee, Belgium. Phone: 32-16-32.15.78. Fax: 32-16-32.19.60. E-mail: chris.michiels{at}agr.kuleuven.ac.be.


Applied and Environmental Microbiology, September 1998, p. 3220-3224, Vol. 64, No. 9
0099-2240/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.



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