title: Mathematical modelling of diurnal regulation of carbohydrate allocation by osmo-related processes in plants.
abstract: Plants synthesize sucrose in source tissues (mainly mature leafs) and supply it for growth of sink tissues (young leafs). Sucrose is derived from photosynthesis during daytime and from starch at night. Because the diurnal regulation of sucrose fluxes is not completely understood, we built a mathematical model designed to reproduce all key experimental observations. For this, assumptions were made about the molecular mechanisms underlying the regulations, which are all motivated by experimental facts. The key regulators in our model are two kinases (SnRK1 and osmo-sensitive kinase OsmK) under the control of the circadian clock. SnRK1 is activated in the night to prepare for regularly occurring carbon-limiting conditions, whereas OsmK is activated during the day to prepare for water deficit, which often occurs in the afternoon. Decrease of SnRK1 and increase of OsmK result in partitioning of carbon towards sucrose to supply growing sink tissues. Concomitantly, increasing levels of the growth regulator trehalose-6-phosphate stimulates the development of new sink tissues and thus sink demand, which further activates sucrose supply in a positive feedback loop. We propose that OsmK acts as a timer to measure the length of the photoperiod and suggest experiments how this hypothesis can be validated.
authors: Institute for Complex Systems and Mathematical Biology, University of Aberdeen, Meston Building, King's College, Aberdeen, UK.
authors: Alexandra
authors: A
authors: Pokhilko
authors: Institute for Complex Systems and Mathematical Biology, University of Aberdeen, Meston Building, King's College, Aberdeen, UK Cluster of Excellence on Plant Sciences (CEPLAS), Heinrich-Heine-University, Universitätsstraße 1, Dusseldorf 40225, Germany oliver.ebenhoeh@uni_duesseldorf.de.
authors: Oliver
authors: O
authors: Ebenhöh
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000378:metabolism; D002241:Carbohydrates / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D002454:Cell Differentiation; D057906:Circadian Clocks; D002940:Circadian Rhythm; D025461:Feedback, Physiological; D008962:Models, Theoretical; D009995:Osmosis; D010770:Phosphotransferases / Q000737:chemistry*; D017440:Photoperiod; D010788:Photosynthesis; D018515:Plant Leaves / Q000378:metabolism; D018521:Plant Physiological Phenomena; D015398:Signal Transduction; D013395:Sucrose / Q000737:chemistry; D013403:Sugar Phosphates / Q000737:chemistry; D014199:Trehalose / Q000031:analogs & derivatives / Q000737:chemistry
chemical_list: D029681:Arabidopsis Proteins; D002241:Carbohydrates; D013403:Sugar Phosphates; C082722:trehalose-6-phosphate; D013395:Sucrose; D002244:Carbon; D014199:Trehalose; D010770:Phosphotransferases
keywords: carbohydrate metabolism; circadian clock; mathematical modelling; plant physiology; systems biology
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