Nitrogen Fixation: From Molecules to Crop Productivity

Volume 38 of the series Current Plant Science and Biotechnology in Agriculture pp 455-456

Flavan-Containing Cells Delimit Frankia Infected Compartments in Casuarina glauca Nodules

  • L. LaplazeAffiliated withPCMA, GeneTrop IRD
  • , H. GherbiAffiliated withPCMA, GeneTrop IRD
  • , T. FrutzAffiliated withPCMA, GeneTrop IRD
  • , K. PawlowskiAffiliated withBiochemie der Pflanze Universitat Göttingen
  • , C. FrancheAffiliated withPCMA, GeneTrop IRD
  • , J-J. MacheixAffiliated withBPVA, Université Montpellier
  • , F. AuguyAffiliated withPCMA, GeneTrop IRD
  • , D. BoguszAffiliated withPCMA, GeneTrop IRD
  • , E. DuhouxAffiliated withPCMA, GeneTrop IRD

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We have found that Frankia infection leads to a dramatic increase of flavans biosynthesis in nodules compared to uninfected roots. We have shown the existence of regular pattern of cell layers containing flavans. Besides the flavan accumulation below the peridem, in the endoderm and between the nodule root and the apex, we have shown accumulation in cell layers of the cortex limiting compartment of infected and uninfected cells. The biological significance of this compartmentation might be to prevent the spread of the endophyte in the vascular bundle and in the nodule root. Alternatively, the flavan layers might contribute to the protection of secondary infection and/or the limitation of oxygen penetration in the nodule.