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Biochemistry of spore germination in Phycomyces

Biochemistry of spore germination in Phycomyces AbstractThe constitutionally dormant spores of Phycomyces blakesleeanus can be activated by heat shock or treatment with several monocarboxylic acids. Activation is followed first by a general stimulation of metabolism, e.g. respiration, protein-, RNA- and cell-wall synthesis, and subsequently by nuclear division and germ-tube emergence. Initial germination is not dependent on RNA synthesis and can even start without protein synthesis. The first common effect of different activating treatments is a transient rise in cyclic AMP (cAMP) content, caused by a change in phosphodiesterase activity after heat activation, and by unknown factors during activation by acids. cAMP transiently activates trehalase and glycerol-3-phosphatase in the spores. The activation of these enzymes causes a quick turnover of trehalose into glycerol. During the same period, the water status of the cells is altered so dramatically that perhaps this may explain at least part of the stimulation of metabolism in the germinating spore. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png FEMS Microbiology Reviews Oxford University Press

Biochemistry of spore germination in Phycomyces

FEMS Microbiology Reviews , Volume 1 (3-4) – Apr 1, 1986

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References (67)

Publisher
Oxford University Press
Copyright
© 1986 Federation of European Microbiological Societies
ISSN
0168-6445
eISSN
1574-6976
DOI
10.1111/j.1574-6968.1986.tb01193.x
Publisher site
See Article on Publisher Site

Abstract

AbstractThe constitutionally dormant spores of Phycomyces blakesleeanus can be activated by heat shock or treatment with several monocarboxylic acids. Activation is followed first by a general stimulation of metabolism, e.g. respiration, protein-, RNA- and cell-wall synthesis, and subsequently by nuclear division and germ-tube emergence. Initial germination is not dependent on RNA synthesis and can even start without protein synthesis. The first common effect of different activating treatments is a transient rise in cyclic AMP (cAMP) content, caused by a change in phosphodiesterase activity after heat activation, and by unknown factors during activation by acids. cAMP transiently activates trehalase and glycerol-3-phosphatase in the spores. The activation of these enzymes causes a quick turnover of trehalose into glycerol. During the same period, the water status of the cells is altered so dramatically that perhaps this may explain at least part of the stimulation of metabolism in the germinating spore.

Journal

FEMS Microbiology ReviewsOxford University Press

Published: Apr 1, 1986

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