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Appl Environ Microbiol. 1992 March; 58(3): 877-883
Copyright © 1992, American Society for Microbiology. All Rights Reserved.

Isolation of New Aureobasidium Strains That Produce High-Molecular-Weight Pullulan with Reduced Pigmentation

Thomas J. Pollock*, Linda Thorne and Richard W. Armentrout

Shin-Etsu Bio, Inc., 6650 Lusk Boulevard, Suite B-106, San Diego, California 92121

ABSTRACT

New isolates of Aureobasidium pullulans were obtained from plant leaf surfaces gathered in San Diego County. The new fungal isolates were identified as A. pullulans on the basis of the appearance of polymorphic colonies formed on agar plates, the electrophoretic profiles of repeated genomic DNA sequences, and the production of pullulan in shake flask cultures. The isolates showed different degrees of pigmentation. One of the natural isolates was nonpigmented under mock production conditions in liquid culture, but was still able to synthesize a reduced amount of pigment on agar plates at late times. A mutagenic treatment with ethidium bromide produced derivatives of normally pigmented natural isolates that exhibited an increased tendency toward yeastlike growth and reduced pigmentation. Additionally, some of the new isolates and mutant derivatives accumulated pullulan of relatively high molecular weight in the culture broths.

FOOTNOTES

* Corresponding author.

Appl Environ Microbiol. 1992 March; 58(3): 877-883
Copyright © 1992, American Society for Microbiology. All Rights Reserved.



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Copyright © 1992 by the American Society for Microbiology. All rights reserved.