Signaling mechanisms integrating root and shoot responses
to changes in the nitrogen supply |
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Authors: | Pia?Walch-Liu Sophie?Filleur Yinbo?Gan Email author" target="_blank">Brian?G?FordeEmail author |
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Institution: | (1) Department of Biological Sciences, Lancaster University, Lancaster, Bailrigg, UK, LA1 4YQ;(2) Present address: Centre for Novel Agricultural Products, University of York, Heslington, York, UK |
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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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Keywords: | abscisic acid auxin cytokinin leaf expansion nitrate nodulation root development shoot: root ratio |
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