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Int J Syst Bacteriol 45 (1995), 729-734; DOI 10.1099/00207713-45-4-729
© 1995 Society for General Microbiology
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Chromosomal Heterogeneity among Various Strains of Spiroplasma citri

FENGCHUN YE1, FRÉDÉRIC LAIGRET2,*, PATRICIA CARLE2 and JOSEPH MARIE BOVÉ2

1 Department of Plant Pathology, Oklahoma State University, Stillwater, Oklahoma 74078
2 Laboratoire de Biologic Cellulaire et Moléculaire, Institut National de la Recherche Agronomique and Université de Bordeaux II, 33883, Villenave d'Ornon Cedex, France

* Corresponding author. Mailing address: Laboratoire de Biologie Cellulaire et Moléculaire, INRA et Universite de Bordeaux II, BP81, 71 Avenue Edouard-Bourleaux, 33883 Villenave d'Ornon Cedex, France. Phone: 33 56 84 31 50. Fax: 33 56 84 31 59. Electronic mail address: laigret{at}bordeaux.inra.fr.

ABSTRACT

The genomes of various Spiroplasma citri strains were digested with several restriction enzymes, and the fragments were analyzed by pulsed-field gel electrophoresis. Polymorphism of the restriction patterns was observed. The genome sizes of the strains obtained when we added the restriction fragment sizes ranged from 1,650 to 1,910 kbp. Physical and genetic maps of 12 strains were constructed by using several DNA probes as genetic markers. The relative positions of mapped loci were conserved in most of the strains; the main differences were differences in the order and number of restriction sites and differences in the sizes of certain fragments. The distribution of viral sequences, which occur at multiple sites in the 5. citri genome and are homologous to the sequences of S. citri virus SpV1 strains R8A2B and S102, was also studied.




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