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

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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 NO3 −and 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.

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Abbreviations

ABA:

abscisic acid

IPT:

ATP/ADP isopentenyltransferase

iGLR:

ionotropic glutamate receptor

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  1. Yinbo Gan

    Present address: Centre for Novel Agricultural Products, University of York, Heslington, York, UK

Authors and Affiliations

  1. Department of Biological Sciences, Lancaster University, Lancaster, Bailrigg, UK, LA1 4YQ

    Pia Walch-Liu, Sophie Filleur, Yinbo Gan & Brian G. Forde

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  1. Pia Walch-Liu
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  2. Sophie Filleur
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  3. Yinbo Gan
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  4. Brian G. Forde
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Correspondence to Brian G. Forde.

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Walch-Liu, P., Filleur, S., Gan, Y. et al. Signaling mechanisms integrating root and shoot responses to changes in the nitrogen supply. Photosynth Res 83, 239–250 (2005). https://doi.org/10.1007/s11120-004-2080-9

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