Abstract
Inoculation of pearlmillet withA. brasilense resulted in significant increase in growth and dry matter both under sterilized and unsterilized conditions. There was a marked stimulation of root growth and increase in the number of lateral roots and root hairs. Nitrogenase activity of the roots was very low and did not support the increase in plant growth due to inoculation. Significant differences in plant growth were observed among the strains ofA. brasilense and the most effective strain was S14, an isolate fromCyanodon dactylon. Strains which caused maximum increase in plant growth in all the experiments showed lower specific nitrogenase activity and total N2-fixation in the laboratory but produced higher quantities of auxins in the culture filtrates.
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