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. 1972 Jul;111(1):260-6.
doi: 10.1128/jb.111.1.260-266.1972.

Effect of peptone on Azotobacter morphology

G R Vela, R S Rosenthal

Effect of peptone on Azotobacter morphology

G R Vela et al. J Bacteriol. 1972 Jul.

Abstract

Pleomorphism in cultures of Azotobacter vinelandii was induced by addition of Difco peptone to the growth medium. Under the conditions of the study, 5% peptone gave rise to transient forms described as "fungoid cells" which were osmotically fragile. After some 48 hr of culture, they became osmotically stable and resumed a more typical morphology. It was shown that the pleomorphism-inducing principle in peptone was glycine.

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