Photosynthesis Research

, Volume 83, Issue 2, pp 239–250

Signaling mechanisms integrating root and shoot responses to changes in the nitrogen supply

  • Pia Walch-Liu
  • Sophie Filleur
  • Yinbo Gan
  • Brian G. Forde
Review

DOI: 10.1007/s11120-004-2080-9

Cite this article as:
Walch-Liu, P., Filleur, S., Gan, Y. et al. Photosynth Res (2005) 83: 239. doi:10.1007/s11120-004-2080-9

Abstract

During their life cycle, plants must be able to adapt to wide variations in the supply of soil nitrogen (N). Changes in N availability, and in the relative concentrations of NO3and NH4+, are known to have profound regulatory effects on the N uptake systems in the root, on C and N metabolism throughout the plant, and on root and shoot morphology. Optimising the plant’s responses to fluctuations in the N supply requires co-ordination of the pathways of C and N assimilation, as well as establishment of the appropriate allocation of resources between root and shoot growth. Achieving this integration of responses at the whole plant level implies long-distance signaling mechanisms that can communicate information about the current availability of N from root-to-shoot, and information about the C/N status of the shoot in the reverse direction. In this review we will discuss recent advances which have contributed to our understanding of these long-range signaling pathways.

Keywords

abscisic acid auxin cytokinin leaf expansion nitrate nodulation root development shoot: root ratio 

Abbreviations

ABA

abscisic acid

IPT

ATP/ADP isopentenyltransferase

iGLR

ionotropic glutamate receptor

Copyright information

© Springer 2005

Authors and Affiliations

  • Pia Walch-Liu
    • 1
  • Sophie Filleur
    • 1
  • Yinbo Gan
    • 1
    • 2
  • Brian G. Forde
    • 1
  1. 1.Department of Biological SciencesLancaster UniversityLancasterUK
  2. 2.Centre for Novel Agricultural ProductsUniversity of YorkYorkUK

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