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Table 1 Results of the Southern hybridizations of undigested plasmid preparations from various spiroplasma species and S. citri strains to either an arp1-derived probe or whole pBJS-O probe. + and - denote positive and negative hybridizations, respectively.

From: Sequence comparisons of plasmids pBJS-O of Spiroplasma citri and pSKU146 of S. kunkelii: implications for plasmid evolution

Spiroplasma Probe Biological features
Species* Strain arp1 pBJS-O Transmissibility Pathogenicity
  BR3-3X + + + +
  BR3-G + + - -
  BR3-T + + + +
S. citri BR3-M + + + +
  BR3-P + + Very low -
  ASP-1 - + Unknown Unknown
  R8A2 - + Unknown Unknown
  Beni Mellal - - Unknown Unknown
S. kunkelii CR2-3X + + + +
S. phoeniceum P40 - - +** +
S. melliferum TS2 + + Unknown -
S. floricola 23-6 - - Unknown -
  1. *S. citri, S. kunkelii, S. phoeniceum and S. melliferum belong to serogroup I, whereas S. floricola belongs to serogroup III. The biological features of the spiroplasmas, except for S. phoeniceum, are taken from references 25 and 46.
  2. **Only experimental transmission to the plant host is known for this spiroplasma. It is unclear whether it can be naturally transmitted by leafhoppers.