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Properties of a germination mutant of Phycomyces blakesleeanus (1986)

Laere, André J. ; Rivero, Francisco

Springer

Archives of microbiology 145 (1986), S. 290-294

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ISSN: 1432-072X

Keywords: Phycomyces ; Spores ; Germination ; cAMP ; Trehalase ; Dormancy

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Abstract Spores of the Phycomyces blakesleeanus strain S440 germinated only for some 4 to 7% when activated with a heat treatment or with ammonium acetate. Contrary to wild type spores, they showed no increase in trehalase activity during or after the activating treatment. This was not due to a variant trehalase or a defective protein kinase but rather to the absence of an increase in cellular cyclic AMP which normally occurs in the wild type. Phosphodiesterase activity in the mutant was comparable to wild type activity and in both strains phosphodiesterase was inactivated by a heat treatment. The phosphodiesterase inhibitor 1-isobutyl, 3-methyl xanthine caused germination and trehalase activation in the wild type but not in the mutant. The results corroborate the importance of cyclic AMP in the breaking of dormancy and the activation of trehalase in this fungus.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00443661

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Spore Dormancy Mutants of Phycomyces

Rivero, F. ; Cerda-Olmedo, E.

Amsterdam : Elsevier

Experimental Mycology 18 (1994), S. 221-229

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ISSN: 0147-5975

Keywords: Phycomyces ; cAMP ; fermentative metabolism ; glycogen ; spore germination

Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002