Abstract
Morphological, developmental and antimetabolite-resistant mutants of T. lanuginosus were characterized and used for screening with the aim to develop constitutive alpha-amylase-hyperproducing strains. The protoplast fusion of two spontaneous mutants of T. lanuginosus, characterized as asporulating and resistant to 2-deoxy-D-glucose (2DG), resulted in sporulating, 2DG sensitive heterokaryotic fusants. A recombinant haploid strain F64fB developed there from produced alpha-amylase constitutively in glucose-containing medium. Constitutive alpha-amylase-hyperproducing mutant (III8) obtained after cyclic mutagenesis and screening yielded approximately 20 fold more alpha-amylase in a glycerol-containing medium than the wild strain.
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