Intratetrad mating: 60 years later

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Abstract

The article describes the history of the discovery and study of intratetrad mating as a form of closely related crosses in fungi. The results of studying the prevalence and genetic features of this phenomenon in phytopathogenic basidiomycete Microbotryum violaceum and yeast (Saccharomyces sp., Saccharomycodes ludwigii) are presented. The evolutionary and genetic consequences of intratetrad mating are considered.

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About the authors

I. A. Zakharov

Vavilov Institute of General Genetics of the Russian Academy of Sciences

Author for correspondence.
Email: iaz34@mail.ru
Russian Federation, Moscow, 119991

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3. Fig. 1. Scheme of the life cycle of heterothallic yeast Saccharomyces. D – diploid cell, A – ascus with a tetrad of haploid spores, H – haploid cells; 1 – fusion of haploid cells of different mating types (a and α); 2 – intratetrad mating – fusion of spores of one ascus; 3 – cytoduction – fusion of haploid cells with the formation of a haploid zygote with mixed cytoplasm (see [17]).

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4. Fig. 2. Expected change in the proportion of heterozygotes for letali in a series of generations with intratetrad mating and linkage of letali with the mating type locus (according to: [34]). Generations are along the abscissa axis, and the proportion of heterozygotes is along the ordinate axis. a – (k – 2a) > (k – s), with k : a : s = 12 : 1 : 3; b – (k – 2a) < (k – s), with k : a : s = 12 : 1 : 1.

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