1887

Abstract

Two mollicutes (strains 0502 [T = type strain] and J233), which were isolated from the surfaces of broccoli ( var. ) plants or the crown tissues of the coconut palm (), were capable of sustained growth in serum-free (or cholesterol-free) mycoplasma broth media. Examination by electron and dark-field microscopic techniques revealed that the cells of each strain were small, nonhelical, nonmotile, pleomorphic, and coccoid and that each cell was surrounded by a single cytoplasmic membrane. No evidence of a cell wall was found. The organisms were filterable and grew rapidly in most conventional mycoplasma culture medium formulations containing horse or fetal bovine sera under either aerobic or anaerobic conditions. The optimum temperature for growth of both organisms was 30°C, but multiplication occurred over a temperature range from 18 to 37°C. Both strains catabolized glucose, but did not hydrolyze arbutin, arginine, or urea. The genome size of strain 0502 was 1,215 kbp, and the DNA base composition (guanine-plus-cytosine content) was 35.5 mol%. The genome size of strain J233 was 1,610 kbp, and the DNA base composition was 30.0 mol%. The two isolates were not serologically related to each other or to the type strains of 11 previously described species. Strain 0502 (= ATCC 49388) is the type strain of sp. nov., and strain J233 (= ATCC 49389) is the type strain of sp. nov.

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1994-10-01
2024-07-24
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