Plant and Soil

, Volume 162, Issue 1, pp 113–116

3Hthymidine incorporation of rhizosphere bacteria influenced by plant N-status

  • H. Christensen
  • S. Christensen
Article
  • 34 Downloads

Abstract

The effect of plant-root N-status on bacterial growth in the rhizosphere was studied with 5-week-old wheat plants grown in soil with low N content obtained by mixing 9:1 gravel:sandy loam. As a consequence of N limitation, significant increase in3Hthymidine (Tdr) incorporation rate occured 3 days after addition of 30 mM ammonium compared to controls without ammonium. Plants were grown with split-roots to separate the effect of soil N from effect of plant root derived organic matter-N on bacterial activity. The increase in nitrate concentration from 10 mM to 30 mM at one part of the root system led to significant increased3HT dr incorporation in the rhizosphere at the other part of root system after 4 days showing that the composition of root exudates became more favourable for bacterial growth when plants were fertilized with the higher level of nitrate.

Key words

ammonium nitrate split-roots root exudate wheat 

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Copyright information

© Kluwer Academic Publishers 1994

Authors and Affiliations

  • H. Christensen
    • 1
  • S. Christensen
    • 1
  1. 1.Department of Population BiologyCopenhagen UniversityCopenhagenDenmark
  2. 2.Biotechnological InstituteLyngbyDenmark

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