Table 2.

Physiologic characteristics and antibiogram for the phosphate solubilizing bacteria isolated from rhizosphere of C. papaya L. in both conventional and organic farming systems

	Farming system
	Conventional					Organic
	Enterobacter sp C	Klebsiella sp C1	Klebsiella sp C2	Klebsiella sp C3	B. vietnamiensis C	B.cepacia O	B. vietnamiensis O	Klebsiella sp O1	Klebsiella sp O2	Klebsiella sp O3	Klebsiella sp O4	Leclercia sp O
Physiology
N Fixation	*	*	*	*	++	++	++	*	*	*	*	++
Siderophore Production	+	+	+	+	+	+	+	+	+	+	+	+
Antibiotic Resistance
Metacycline	r	r	r	r	r	r	r	r	r	r	r	nd
Ampicillin	r	r	r	r	r	r	r	r	r	r	r	nd
Chloramphenicol	s	s	s	s	s	s	s	s	s	s	s	nd
Erythromycin	s	s	s	s	s	s	s	s	s	s	s	nd
Kanamycin	s	s	s	s	s	s	s	s	s	s	s	nd
Tetracycline	s	s	s	s	s	s	s	s	s	s	s	nd

*, no nitrogen-fixing; ++, nitrogen-fixing; +, producing Siderophores; r, antibiotic resistant; s, susceptible to antibiotics; nd, not detectable