Studies were conducted to determine the relationship of vitamin production and ability to dissolve bicalcium phosphate in bacteria isolated from rhizosphere, rhizoplane and control soil. Production of vitamin B12, riboflavin, niacin, pantothenate and biotin was determined using a bioassay procedure that may be useful for large-scale screening of bacteria for vitamin production. Among isolates producing one or more vitamins, 76.4, 37.5 and 57.5% of control, rhizosphere and rhizoplane isolates, respectively, solubilized phosphate. However, phosphate-solubilizing isolates from rhizosphere and rhizoplane were more active vitamin producers than solubilizing isolates from control soil, and non-solubilizing isolates from any of the three regions. Production of vitamin B12, riboflavin and niacin by rhizosphere isolates and of riboflavin by rhizoplane isolates was also correlated with ability to solubilize phosphate, but similar relationships were not observed for control isolates. © 1981.
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