Multilevel genomics analysis of carbon signalling during low carbon availability: coordinating the supply and utilisation of carbon in a fluctuating environment

Functional Plant Biology : FPB
Mark StittMaria Piques

Abstract

Plants alternate between a net surplus of carbon in the light and a net deficit at night. This is buffered by accumulating starch in the light and degrading it at night. Enough starch is accumulated to support degradation throughout the night, with a small amount remaining at the end of the 24-h diurnal cycle. This review discusses how this balance between the supply and utilisation of carbon is achieved in Arabidopsis. It is important to regulate starch turnover to avoid an acute carbon deficiency. A 2-4 h extension of the night leads to exhaustion of starch, a collapse of sugars, a switch from biosynthesis to catabolism and an acute inhibition of growth by low carbon, which is not immediately reversed when carbon becomes available again. In starchless pgm mutants, where sugars are depleted each night, this leads to a recurring inhibition of growth that is not reversed until 5-6 h into the following light period. Several lines of evidence show that starch accumulation is regulated in response to events that are initiated during periods of low carbon. Starch accumulation is decreased when small amounts of sucrose are included in the growth medium. Sets of sugar-responsive genes were identified by supplying sugars to carbon-star...Continue Reading

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Citations

Jun 10, 2009·Proceedings of the National Academy of Sciences of the United States of America·Ronan SulpiceMark Stitt
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