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GENETIC ANALYSIS OF MATING LOCUS LINKED MUTATIONS IN CHLAMYDOMONAS REINHARDII
R. E. Galloway 1 and U. W. Goodenough 1
1 Department of Biology, Washington University, St. Louis, Missouri
63130
The mating-type (mt) locus of Chlamydomonas reinhardii has been analyzed using four mutant strains (imp-1, imp-10, imp-11 and imp-12). All have been shown, or are shown here, to carry mutations linked to either the plus (mt+) or the minus (mt-) locus, and their behavior in complementation tests has allowed us to define several distinct functions for each locus. Specifically, we propose that the mt+ locus contains the following genes or regulatory elements: a locus designated sfu, which is necessary for sexual fusion between gametes; a locus designated upp (uniparental plus), which controls aspects of chloroplast gene inheritance and perhaps also zygote maturation; and a locus designated sad, which functions in sexual adhesion. The mt- locus also contains a sad locus as well as a gene or regulatory element designated mid, which is necessary for the minus dominance in mt+/mt- diploids.
Submitted on March 25, 1985Accepted on July 22, 1985
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