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Regulation of Carbon and Nitrogen Assimilation Through Gene Expression

  • Tatsuo Sugiyama
  • Hitoshi Sakakibara
Part of the Advances in Photosynthesis and Respiration book series (AIPH, volume 12)

Summary

Regulation of the partitioning of nitrogen (N) into proteins is an important mechanism whereby plants can alter metabolism to adjust or acclimate to changes in N availability. Alterations in N assimilation brought about by changes in N availability require regulation of other metabolic processes and re-allocation of nutrients. This requires the mutual coordination and complementation of metabolism and allocation throughout the plant by shuttling substrates, metabolites, and signals. The control of the C/N interaction is particularly important since these elements are abundant in plants and provide the skeletons and moieties for most of the building biomolecules. As a signaling pathway to communicate between plants and their nutritional environment, the ‘His-Asp phosphorelay,’ concept originally called ‘two-component system,’ has recently been proposed in higher plants. This chapter focuses on the recent advances that have uncovered genes and mechanisms responsible for the regulation of N partitioning into the machinery of C and N assimilation.

Abbreviations

AlaAT — alanine aminotransferase ARR — Arabidopsis thaliana response regulators AS — asparagine synthetase Asn — asparagine Asp — aspartate AspAT — aspartate aminotransferase C — Carbon C3 — three carbon C4 — four carbon C4Ppcl — C4-type PEP carboxylase C4Ppdk — C4-type PPDK cAlaAT — cytosolic AlaAT Fd — ferredoxin FNR — Fd-NADP oxidoreductase Gln — glutamine Glu — glutamate GOGAT — glutamate synthase GS — glutamine synthetase HPt — His-containing phosphotransfer domain mAlaAT — mitochondrial AlaAT N — nitrogen NIR — nitrite reductase NR — nitrate reductase PEP — phosphoenolpyruvate PEPc — PEP carboxylase PPDK — pyruvate, orthophosphate dikinase RPP — reductive pentose phosphate: Rubisco-ribulose-1,5-bisphosphate carboxylase/oxygenase SUMT — S-adenosylmethionine- dependent uroporphyrinogen III C-methyltransferase Z — t-zeatin ZmRR — Zea mays response regulators ZR — t-zeatin riboside 

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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • Tatsuo Sugiyama
    • 1
  • Hitoshi Sakakibara
    • 2
  1. 1.Plant Science CenterRIKEN (The Institute of Physical and Chemical Research)WakoJapan
  2. 2.Laboratory for Communication MechanismRIKEN (The Institute of Physical and Chemical Research) Plant Science CenterWakoJapan

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