• Nitrogenase activity of pearl millet—Azospirillum association in relation to the availability of organic carbon in the root exudates

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    • Keywords


      Root exudates; organic carbon; N2-ase activity; pearl millet; Azospirillum

    • Abstract


      There were significant differences in the amount of organic carbon exuded by the roots of different pearl millet varieties. The nitrogenase activity of the axenically grown pearl millet varieties inoculated withAzospirillum was related to the quantity of organic carbon released by their roots. However, the amount of exudate was found to be inadequate for the optimum expression of N2-ase activity which was considerably enhanced following the addition of carbon source. The stimulation of activity varied with the type of a carbon source and was related to preference shown by the organism for its growth in vitro. There was no significant change in the total plant dry weight following the addition of carbon to the root zone but there was a marginal reduction in the root growth and the root/shoot ratio.

    • Author Affiliations


      A V Rao1 B Venkateswarlu1

      1. Division of Soil-Water-Plant-Relationship, Central Arid Zone Research Institute, Jodhpur - 342 003, India
    • Dates


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