1887

Abstract

Spiroplasma strain LD-1 (T = type strain), which was isolated from the gut of a Colorado potato beetle () larva collected in Maryland, was serologically distinct from other spiroplasmas. Similar isolates were obtained from other specimens collected in various parts of North America, in Poland, and in other eastern European countries and from specimens collected in Texas. Cells of strain LD-1, which in early passages were spiral, exhibited exceptionally rapid translational motility. This rapid motility and the spiral shape were lost after extended passage in culture. The organism required serum for growth. Originally isolated in coculture with insect cells in DCCM medium, strain LD-1 adapted to several media in the absence of cocultured cells. Use of anaerobic conditions allowed primary isolation in a variety of media. The organism did not grow in serum-free media containing 2% serum fraction. Optimal growth in M1D medium occurred at 30 to 37°C (doubling time, 7.2 h). On solid M1D medium containing 2.0% Noble agar (pH 6.25) at 30°C, strain LD-1 produced discrete colonies with numerous satellites. Strain LD-1 hydrolyzed arginine, but did not utilize urea; there was evidence of weak fermentation of glucose. The guanine-plus-cytosine content of the DNA was determined to be 25 ± 1 mol%, and the genome size was 1,085 kb. The results of extensive studies of the ecology of this spiroplasma suggest that it is host specific for beetles. Strain LD-1 (= ATCC 43213) is designated the type strain of a new species, .

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1996-10-01
2022-10-04
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