Abstract
Sexual isolation between dioecious isogamous syngens of the clade Chlamydomonas moewusii can be ascribed to the nonoccurrence of initial contact between noncompatible gamete types. As demonstrated by its sensitivity to enzymes and concanavalin, sex-cell contact depends on a molecular complementarity between glycoproteinaceous components on the gametic flagella tips, the mating-type substances. In related syngens gamete contact is mediated by a carbohydrate ligand on one gamete type interacting with a trypsin-sensitive, sugar-binding component on the other. Modulating features render this basic complementarity taxon specific and account for cell-to-cell recognition and the gametic isolation between syngens. The polymorphism of the bipolar contact mechanism seems to be conditioned by a specifying complexity of the carbohydrate compound on the (+) substance and its selective recognition by a discriminating contact site on the (-) substance. A comparative study between several related taxa suggests a simple c...
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