INTERSEXUAL HETEROZYGOUS PHYCOMYCES

摘要

The present invention discloses intersexual heterozygous Phycomyces strains. These strains show an improved .beta.-carotene productivity and an increased stability when compared with both the wild typ e and heterokaryotic Phycomyces strains. The pres- ent invention also disclosed a method for obtaining Phycomyces transformants without using selection markers. Furthermore, a process is provided for producing .beta.-carotene comprising the use of intersexual heterozygous Phycomyces strains in a submerged culture.