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Abstract
Mutants of the filamentous fungusMucor circinelloidesaltered in the synthesis of β-carotene (genotypecar) have been isolated by direct inspection of the color shown by the colonies derived from mutagenized spores. The mutants were analyzed for the carotenoid content in darkness and light and studied with respect to complementation in heterokaryons made by spheroplast fusion. The results revealed the existence of at least four complementation groups. ThecarBmutants are white and accumulate phytoene. ThecarRmutants are red and accumulate lycopene. ThecarPmutants are most likely disturbed in the synthesis of phytoene: two of them are white and do not accumulate carotenoids; anothercarPmutant is yellowish, probably because it is leaky. There are three yellowish mutants which belong to one or more complementation groups different fromcarB, carR,andcarP.Two white mutants obtained in a single mutagenization step failed to complement with thecarRand thecarPmutants. The wild-type and thecarBandcarRmutants tested forM. circinelloidesshowed similar photoinduction.
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