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The MYSTERY of the altered GENE Professor Peter M Gresshoff p.gresshoff@uq.au

The MYSTERY of the altered GENE Professor Peter M Gresshoff p.gresshoff@uq.edu.au www.cilr.uq.edu.au. NODULE FORMATION and NITROGEN FIXATION Professor Peter M Gresshoff p.gresshoff@uq.edu.au www.cilr.uq.edu.au. LEGUMES form NODULES. Nodules. Sucrose. 1 mm. Nitrogen Gas.

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The MYSTERY of the altered GENE Professor Peter M Gresshoff p.gresshoff@uq.au

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  1. The MYSTERY of the altered GENE Professor Peter M Gresshoff p.gresshoff@uq.edu.au www.cilr.uq.edu.au

  2. NODULE FORMATION and NITROGEN FIXATION Professor Peter M Gresshoff p.gresshoff@uq.edu.au www.cilr.uq.edu.au

  3. LEGUMES form NODULES Nodules Sucrose 1 mm Nitrogen Gas Amino acids/protein/DNA/RNA Ammonium

  4. N2 + 16 ATP + 8 e- + 8 H+ 2 NH3 + 16 ADP + H2 ENERGY: Solar (photosynthesis) or fossil (Haber-Bosch process)????

  5. Nodulation and nitrogen fixation are key processes for food, feed, and fuel Nodule induction Colonisation Endosymbiosis Root hair deformation and curling Nitrogen Fixation Protein-rich Seeds Cell Division

  6. Nod factors Nod genes RECEPTION NFR1/5 Rhizobium FLAVONES Legume Root

  7. Root hairs Rhizobia

  8. Curling root hair

  9. Infection pocket Cell walls Infection thread

  10. Cell nuclei Inner cortex cells dividing Vascular bundle

  11. Infection thread Rhizobia in cortex

  12. Nodule primordium Epidermis Xylem Cortex Phloem

  13. Bacteroids Vasculature

  14. Nodule cortex Nucleus Rhizobium cells (25,000)

  15. The NODULATION process allows the conversion of atmospheric nitrogen gas to ammonia - which is a fertiliser for all plants malate amino acids Bacteroid within a legume nodule cells, engulfed by a plant membrane controlling nutrient and ammonia transport N2 + 16 ATP + 8 e- + 8 H+ 2 NH3 + 16 ADP + H2 ammonia

  16. ? ? ? ? ?

  17. Thanks to Uli, Brett, Akira, Igor and others for photos

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