Legume nodulation: successful symbiosis through short- and long-distance signalling.

@article{Kinkema2006LegumeNS,
  title={Legume nodulation: successful symbiosis through short- and long-distance signalling.},
  author={Mark Kinkema and Paul T. Scott and Peter M. Gresshoff},
  journal={Functional plant biology : FPB},
  year={2006},
  volume={33 8},
  pages={
          707-721
        }
}
Nodulation in legumes provides a major conduit of available nitrogen into the biosphere. The development of nitrogen-fixing nodules results from a symbiotic interaction between soil bacteria, commonly called rhizobia, and legume plants. Molecular genetic analysis in both model and agriculturally important legume species has resulted in the identification of a variety of genes that are essential for the establishment, maintenance and regulation of this symbiosis. Autoregulation of nodulation… 
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Computational Complementation: A Modelling Approach to Study Signalling Mechanisms during Legume Autoregulation of Nodulation
TLDR
It is predicted by computational complementation that the cotyledon is part of the shoot in terms of AON and that it produces the SDI signal, a result that was confirmed by reciprocal epicotyl-and-hypocotyl grafting in a real-plant experiment.
Functional genomic analysis of systemic cell division regulation in legumes
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High through-put transcript analysis in soybean leaf and root indicated that major genes involved in JA synthesis or response are preferentially down-regulated in leaf but not root of wild type, but not NARK mutants, suggesting that AON signaling may in part be controlled by events relating to hormone metabolism.
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References

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TLDR
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