Understanding circadian regulation of carbohydrate metabolism in arabidopsis using mathematical models

Alex A.R. Webb, Akiko Satake

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

C3 plants assimilate carbon by photosynthesis only during the day, but carbon resources are also required for growth and maintenance at night. To avoid carbon starvation, many plants store a part of photosynthetic carbon in starch during the day, and degrade it to supply sugars for growth at night. In Arabidopsis, starch accumulation in the day and degradation at night occur almost linearly, with the shape of this diel starch profile adaptively changing to allow continuous supply of sugar even in long-night conditions. The anticipation of dawn required to ensure linear consumption of starch to almost zero at dawn presumably requires the circadian clock. We review the links between carbon metabolism and the circadian clock, and mathematical models aimed at explaining the diel starch profile. These models can be considered in two classes, those that assume the level of available starch is sensed and the system ensures linearity of starch availability, and those in which sugar sensing is assumed, yielding linearity of starch availability as an emergent property of sucrose homeostasis. In the second class of model the feedback from starch metabolism to the circadian clock is considered to be essential for adaptive response to diverse photoperiods, consistent with recent empirical data demonstrating entrainment of the circadian clock by photosynthesis. Knowledge concerning the mechanisms regulating the dynamics of starch metabolism and sugar homeostasis in plants is required to develop new theories about the limitations of growth and biomass accumulation.

Original languageEnglish
Pages (from-to)586-593
Number of pages8
JournalPlant and Cell Physiology
Volume56
Issue number4
DOIs
Publication statusPublished - Jan 1 2015
Externally publishedYes

Fingerprint

Carbohydrate Metabolism
carbohydrate metabolism
Arabidopsis
Starch
Theoretical Models
mathematical models
starch
Circadian Clocks
Carbon
circadian rhythm
carbon
sugars
Photosynthesis
metabolism
homeostasis
Homeostasis
Growth
photosynthesis
C3 plants
Photoperiod

All Science Journal Classification (ASJC) codes

  • Medicine(all)
  • Physiology
  • Plant Science
  • Cell Biology

Cite this

Understanding circadian regulation of carbohydrate metabolism in arabidopsis using mathematical models. / Webb, Alex A.R.; Satake, Akiko.

In: Plant and Cell Physiology, Vol. 56, No. 4, 01.01.2015, p. 586-593.

Research output: Contribution to journalArticle

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