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Possible relationships among cellular energy status and the induction and initiation of aflatoxin synthesis were studied by using replacement culture techniques in conjunction with aflatoxin-supporting and-nonsupporting media. Transcription and translation processes associated with the induction of aflatoxin synthesis occurred 3 to 6 and 6 to 10 h, respectively, after mycelia were transferred to glucose-containing media. From adenylate energy charge determinations and in situ 31P nuclear magnetic resonance analyses, a relationship between overall energy status and the induction or initiation of aflatoxin synthesis could not be identified; however, electron microscopic evaluations indicated that aflatoxin synthesis occurred in association with a glucose-mediated inactivation of mitochondria. The results suggest that aflatoxin synthesis is not regulated by the overall energy status of the fungal cell but may be controlled by the energy status of specific subcellular compartments.

Regulation of aflatoxin biosynthesis: assessment of the role of cellular energy status as a regulator of the induction of aflatoxin production