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A mutation (modE), previously described as a membrane mutation, results in several modifications of the female developmental cycle: a high density of protoperithecia, the unscheduled development of protoperithecia into sterile perithecia on the homokaryons of each mating type, and the independence of ascospore outgrowth from the substances normally required for germination. Cultured in liquid medium, the modE strain showed two additional specific features: a higher growth yield than that of wild-type cultures (plus 10% of dry weight) and an extreme reduction of cell life span. Both mutant traits were specific to glucose limitation. Despite the large difference existing in the sensitivity of cells to glucose starvation, the glycogen and trehalose reserves of mutant and wild-type cells were nearly identical. Considered together, these results suggest that the primary effect of the mutation lies in the disruption of a glucose-dependent regulation controlling the transition of the metabolic pattern of cells from growth to quiescence.

Podospora mutant defective in glucose-dependent growth control