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J Bacteriol. 1964 January; 87(1): 150-155
Copyright © 1964 by the American Society for Microbiology. All Rights Reserved.

ACCUMULATION OF PHOSPHORUS COMPOUNDS BY MUCOR RACEMOSUS¹

^a Department of Microbiology, The Pennsylvania State University, University Park, Pennsylvania

ABSTRACT

JAMES, A. W. (The Pennsylvania State University, University Park), AND L. E. CASIDA, JR. Accumulation of phosphorus compounds by Mucor racemosus. J. Bacteriol. 87:150–155. 1964.—In glucose-inorganic salts media containing excess KH₂PO₄, Mucor racemosus accumulated 5 to 6% phosphorus on a dry-weight basis in its mycelium. Fractionation of phosphorus compounds in young, rapidly growing mycelium revealed that approximately 58% of this phosphorus was in the form of inorganic polyphosphate; nucleic acids accounted for an additional 17% of the total phosphorus. Upon further growth, morphological changes were observed in many of the hyphae, and polyphosphate appeared in the culture media. In media containing limited amounts of KH₂PO₄, exogenous polyphosphate was utilized by M. racemosus, and the phosphorus content of the mycelium decreased to approximately 0.3%.

² Present address: Biochemistry Department, University of California, Berkeley.

¹ Authorized for publication on 13 September 1963 as paper no. 2825 in the journal series of the Pennsylvania Agricultural Experiment Station.