Pokhilko, Alexandra and Ebenhoeh, Oliver ORCID: 0000-0002-7229-7398 (2015). Mathematical modelling of diurnal regulation of carbohydrate allocation by osmo-related processes in plants. J. R. Soc. Interface, 12 (104). LONDON: ROYAL SOC. ISSN 1742-5662

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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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Pokhilko, AlexandraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ebenhoeh, OliverUNSPECIFIEDorcid.org/0000-0002-7229-7398UNSPECIFIED
URN: urn:nbn:de:hbz:38-409998
DOI: 10.1098/rsif.2014.1357
Journal or Publication Title: J. R. Soc. Interface
Volume: 12
Number: 104
Date: 2015
Publisher: ROYAL SOC
Place of Publication: LONDON
ISSN: 1742-5662
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SUCROSE-PHOSPHATE SYNTHASE; SNF1-RELATED PROTEIN-KINASE; ARABIDOPSIS-THALIANA; TREHALOSE 6-PHOSPHATE; STARCH DEGRADATION; CIRCADIAN CLOCK; TREHALOSE-6-PHOSPHATE SYNTHASE-1; GENE-EXPRESSION; SPINACH LEAVES; ABSCISIC-ACIDMultiple languages
Multidisciplinary SciencesMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/40999

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