Previous studies of species indicated that this genus could be separated from on the basis of the ability to synthesize lipids from acetate. We report that recently described strains of (strain L1 isolated from a lemon flower and strain GF-1 isolated from a grapefruit flower) and two unclassified strains (strain J233 from coconut palm and sp. strain PS-1 from an insect) convert little if any acetate carbon to lipid, in contrast to sp. strain 0502-CL1 isolated from broccoli and six other established species of animal origin. Thus, the ability to synthesize lipid from acetate in Edward test medium containing horse serum is not characteristic of all members of the genus (class ), but appears to be a property only of a subgroup in the genus containing the species that are most frequently isolated from animals ( BTS39, 19L, N93, and probably S743 and PG49). Like other species which we studied, PG11, PG27, G230, and four sterol-requiring mycoplasmas of insect or plant origin ( sp. strain MQ3 from an insect, sp. strain pommier from an apple, sp. strain melaleuca from a flower, and sp. strain 831-C4 from lettuce) convert little acetate to lipid. Similarly, eight serovars of convert little if any acetate to lipid.


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