In vitro screening of the isolates for zinc solubilization and growth promoting attributes

Abstract

In our present study, screening was carried out for the Zinc solubilizing ability of bacteria isolated from the rhizosphere of rice. All the 40 isolates subjected for screening for their efficiency to produce solubilization zone around the colonies on TRIS-minimal agar plates supplemented with 0.1% ZnO. Out of 40 bacterial isolates, two of them produced highest zone of solubilization which were notified as MZSB- 8 and MZSB- 6 with a hallow zone of 21 mm and 19 mm diameter respectively. In the broth assay, total zinc in the media was found to be solubilized by MZSB8 on the 21st day i.e. 17.675 ppm. Later, the isolates were examined for their plant growth influencing characters viz., production of IAA, siderophore and phosphate solubilization for which MZSB8 and MZSB6 showed maximum results.