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J Bacteriol. 1964 February; 87(2): 293-302
Copyright © 1964 by the American Society for Microbiology. All Rights Reserved.

PIGMENTATION AND TAXONOMY OF THE GENUS XANTHOMONAS

^a Department of Bacteriology, University of California, Davis, California

ABSTRACT

STARR, MORTIMER P. (University of California, Davis), AND WILLIAM L. STEPHENS. Pigmentation and taxonomy of the genus Xanthomonas. J. Bacteriol. 87:293–302. 1964.—The colonies formed by phytopathogenic bacteria of the genus Xanthomonas are typically yellow in color. This chromogenesis stems from the presence in all yellow xanthomonads of a particular carotenoid pigment. This unique "Xanthomonas-carotenoid," which has not been found in any yellow nonxanthomonad, is characterized herein to the extent required for its recognition by relatively simple screening procedures. In general, the occurrence of a carotenoid "alcohol" with absorption maxima at 418, 437, and 463 mµ (petroleum ether)—in a gram-negative, polarly-flagellated, oxidative, rod-shaped bacterium—would suggest placement of that microorganism in the genus Xanthomonas.

¹ Present address: Department of Biology, Chico State College, Chico, Calif.