SEXUAL REPRODUCTION AND INTERCROSSING IN VOLVULINA STEINW1

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Abstract
Gametes of Volvulina steinii barnearapical mating papillae. Zygospore germination yields a single biflagellate cell that develops into a colony whose asexual progeny are all of the same mating type. Backcrossing of clones of progeny indicated a 1:1 ratio of mating types among the progeny. Of 20 clones from a number of localities, none was homothallic and 3 showed no mating reaction. Mating reactions of clones crossed in all possible combinations indicated the presence of 2 sexually isolated groups of clones producing smooth-walled zygospores and 1 group that produced spiny-walled zygospores. In the latter group weak and nonreciprocal mating reactions occurred in some clone combinations. Failure of germination of spiny-walled zygospores from certain crosses suggests further subdivision into genetically isolated groups.

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