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The impact of media composition and petite mutation on the longevity of a polyploid brewing yeast strain
Author(s) -
Powell C.D.,
Quain D.E.,
Smart K.A.
Publication year - 2000
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1046/j.1472-765x.2000.00766.x
Subject(s) - brewing , yeast , longevity , saccharomyces cerevisiae , biology , strain (injury) , polyploid , senescence , ageing , fermentation , genetics , food science , ploidy , gene , anatomy
Ageing in Saccharomyces cerevisiae is a finite phenomenon, determined by replicative, rather than chronological lifespan. Yeast physiological condition is known to influence industrial fermentation performance, however, until recently cellular senescence has not been considered as a brewing yeast stress factor. A polyploid lager yeast (BB11) and a brewery isolate, exhibiting petite mutation were analysed for longevity. It was observed that mitochondrial deficiency induced a reduction in lifespan. In addition, replicative capacity was perceived to be dependent on environmental conditions.