Isolation and Physiological Characterization of PGPR from Potato Plant Rhizosphere in Medium Land of Buru Island

A total of 70 bacteria were isolated from the rhizosphere of potato cv. Hartapel that grew at an altitude of 700 m above sea level on the island of Buru-Maluku. Of these isolates, 36 isolates were capable of producing IAA, GA, Siderophore and phosphate solubilization. Among the selective isolates, isolate HB8 produced the highest amount of IAA (5.816 mg l-1), while isolate HB32 produced the highest amount of GA (6.879 mg l-1). Isolate HB18 had the best ability in producing salicylate type siderophore (4.214 mg l-1) and isolate HB3 showed the highest phosphate solubilization (14.237 mg l-1). There were three isolates (HB3, HB8 and HB31) positively produced HCN. All 36 isolate showed physiological characters which revealed the potential use for biostimulant, biofertilizer and bioprotectant against soil borne pathogens.