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Effects of heavy metals and initial buffering variations on phosphate solubilization of insoluble phosphate were studied. Fourteen PSF obtained were quantitatively screened for phosphate solubilization. The best isolate in each rhizosphere were selected and subjected for further evaluation. The best two isolates were subjected to different buffering values and heavy metal concentrations. Results indicated that there were no significant differences between control of GF1 and 1ug/ml and control of PF7 upto 10 ug/ml copper concentrations. But the solubilization performances of each isolates in cadmium and zinc media indicated that there are significant differences between control and all the concentrations, except for GF1 were there was no significant differences (P˃0.05) between controls and 1ug/ml of cadmium. The results on pH variation showed that isolate GF1 and PF7 were able to solubilize insoluble phosphate at various initial pH levels, but isolate GF1 can be used as better phosphate solubilizers at extreme environmental stress condition..But since these two fungal isolates tested have shown some level of resistance to heavy metal tested, this may make them potential candidates for further investigations for bioremediation of polluted environment and even solubilization at heavy metal environment. Keywords: Buffering, Phosphate solubilization, Heavy metal, Environmental stress, Rhizosphere.

iosr journal of pharmacy and biological sciences

Impact of heavy metals and initial pH variations on the phosphate solubilizing fungi (PSF) isolated from Nsukka pepper and gardenegg plants rhizosphere