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Applied and Environmental Microbiology, January 2000, p. 257-261, Vol. 66, No. 1
0099-2240/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Comparative Study of Pressure- and Nutrient-Induced
Germination of Bacillus subtilis Spores
Elke Y.
Wuytack,
Johan
Soons,
Filip
Poschet, and
Chris W.
Michiels*
Laboratory of Food Microbiology, Katholieke
Universiteit Leuven, Leuven, Belgium
Received 6 July 1999/Accepted 22 October 1999
Germination experiments with specific germination mutants of
Bacillus subtilis, including a newly isolated mutant
affected in pressure-induced germination, suggest that a pressure of
100 MPa triggers the germination cascades that are induced by the nutrient germinant alanine (Ala) and by a mixture of asparagine, glucose, fructose, and potassium ions (AGFK), by activating the receptors for alanine and asparagine, GerA and GerB, respectively. As
opposed to germination at 100 MPa, germination at 600 MPa apparently shortcuts at least part of the Ala- and AGFK-induced germination pathways. Inhibitors of nutrient-induced germination (HgCl2
and N
-P-tosyl-L-arginine methyl ester) also
inhibit pressure-induced germination at 600 MPa, suggesting that
germination at 600 MPa involves activation of a true physiological
germination pathway and is therefore not merely a physico-chemical
process in which water is forced into the spore protoplast.
*
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, January 2000, p. 257-261, Vol. 66, No. 1
0099-2240/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
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