No inbreeding degeneration in a homozygous Hungarian wine yeast

János, Zsolt and Bánhidi, Zoltán (1948) No inbreeding degeneration in a homozygous Hungarian wine yeast. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 18. pp. 377-383. ISSN 0365-3005

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Abstract

We prepared single ascospore cultures from the 16 progeny of 4 daughter strains of the "Balaton Füred 2" strain of Hungarian wine yeast and found a successive increase in the percentual ratio of 2-spored asci at the expense of the one-spored, as opposed to the proportions maintained in the mother strain and the Fx generation. The ratio of 3 and 4 spored asci did not change during the three generations. The germinating capacity of the asci did not diminish even in the third generation. Investigation of fermentative capacity showed no differences between the mother and daughter strains. The data from this investigation establish that the material examined is free from the inbreeding degeneration which usually occurs. In none of the three generations of spores isolated by Inicromanipulator are colonies regularly formed in all cases, but in operating on many asci we could always find 4-spored ones all the isolated spores of which did form colonies. From this we point out that the nongermination of one or two sister spores deriving from one 4-spored ascus cannot always be taken as a sign of heterozygosis.

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