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J Bacteriol. 1962 May; 83(5): 1025-1028
Copyright © 1962, The Williams & Wilkins Company. All Rights Reserved.

HETEROCARYOSIS-LIKE PHENOMENON IN BACILLUS SUBTILIS

Institute of Applied Microbiology, University of Tokyo, Tokyo, Japan

ABSTRACT

IKEDA, Y. (University of Tokyo, Tokyo, Japan) AND T. IIJIMA. Heterocaryosis-like phenomenon in Bacillus subtilis. J. Bacteriol. 83:1025–1028. 1962.—When a mixture of methionine-dependent, histidine-dependent, streptomycin-resistant cells and tryptophan-dependent, streptomycin-sensitive cells of Bacillus subtilis K is plated on minimal medium supplemented with asparagine and streptomycin, tiny colonies consisting of both component cells and X-type cells appear at a frequency of about 10^–6. Because the X-type cell segregates persistently both components and X-type, even after spore formation, it is considered to be a heterocaryon or a syncaryon possessing two kinds of genomes in a common cytoplasm.