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 Previous Article

J. Bacteriol., Jul 1996, 3985-3988, Vol 178, No. 13
Copyright © 1996, American Society for Microbiology

Physical map of the Western X-disease phytoplasma chromosome

G Firrao, CD Smart and BC Kirkpatrick
Dipartimento di Biologia Applicata alla Difesa delle Piante, Universita di Udine.

A physical map of the chromosome of the western X-disease phytoplasma was constructed and represents the first physical map of a phytoplasma chromosome. The western X-disease phytoplasma is a nonculturable, plant- pathogenic member of the class Mollicutes and is the causal agent of a severe disease of fruit trees in North America. The map was generated by performing restriction digests of the chromosome and resolving the restriction fragments by pulsed-field gel electrophoresis. Southern blot analysis using cloned phytoplasma probes confirmed the arrangement of contiguous restriction fragments. The locations of 20 restriction sites for the enzymes SalI, XhoI, BssHII, RsrII, SmaI, and NotI were mapped on the chromosome, which is circular and comprises approximately 670 kb. The locations or the two rRNA operons and of four previously cloned fragments of chromosomal DNA were also placed on the map.


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