Thursday 27 February 2020, 1.00PM
Speaker(s): George Constable, University of York
Sexual reproduction is not always synonymous with the existence of two morphologically different sexes; isogamous species produce sex cells of equal size, typically falling into multiple distinct self-incompatible classes, termed mating types. A long-standing open question in evolutionary biology has been what governs the number of these mating types across species, which varies from 2 in many yeasts and algae, to hundreds or even thousands in some multicellular fungi.
In this talk I will describe some recent modelling work that suggests that the rate of sexual reproduction in these species may prove to be a key predictor of the number of sexes observed [1,2,3]. I will then go on to describe my plans for future work investigating the link between mating type number and genetic diversity in these species, with a particular emphasis on the role of sexual reproduction in the evolution of plant pathogenic fungi.
 The rate of facultative sex governs the number of expected mating types in isogamous species, Nature Ecology & Evolution, 2018 G.W.A.C, H. Kokko
 Invasion and extinction dynamics of mating types under facultative sexual reproduction, Genetics, 2019, P. Czuppon, G.W.A.C
 Fitness differences suppress the number of mating types in evolving isogamous species, To Appear: Royal Society Open Science, Y. Krumbeck, G.W.A.C, T. Rogers
Location: Dianna Bowles Lecture Theatre B/K/018