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.

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	-

*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.

**Only experimental transmission to the plant host is known for this spiroplasma. It is unclear whether it can be naturally transmitted by leafhoppers.