Diurnal changes in the transcriptome encoding enzymes of starch metabolism provide evidence for both transcriptional and posttranscriptional regulation of starch metabolism in Arabidopsis leaves

Plant Physiology
Steven M SmithAlison M Smith

Abstract

To gain insight into the synthesis and functions of enzymes of starch metabolism in leaves of Arabidopsis L. Heynth, Affymetrix microarrays were used to analyze the transcriptome throughout the diurnal cycle. Under the conditions employed, transitory leaf starch is degraded progressively during a 12-h dark period, and then accumulates during the following 12-h light period. Transcripts encoding enzymes of starch synthesis changed relatively little in amount over 24 h except for two starch synthases, granule bound starch synthase and starch synthase II, which increased appreciably during the transition from dark to light. The increase in RNA encoding granule-bound starch synthase may reflect the extensive destruction of starch granules in the dark. Transcripts encoding several enzymes putatively involved in starch breakdown showed a coordinated decline in the dark followed by rapid accumulation in the light. Despite marked changes in their transcript levels, the amounts of some enzymes of starch metabolism do not change appreciably through the diurnal cycle. Posttranscriptional regulation is essential in the maintenance of amounts of enzymes and the control of their activities in vivo. Even though the relationships between trans...Continue Reading

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Citations

Oct 16, 2008·Plant Molecular Biology·Fiona C RobertsonAlex A R Webb
May 5, 2010·Proceedings of the National Academy of Sciences of the United States of America·Alexander GrafAlison M Smith
Nov 26, 2010·Proceedings of the National Academy of Sciences of the United States of America·Sunghyun HongC Robertson McClung
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Jan 15, 2011·Plant Physiology·Valera V PeremyslovValerian V Dolja
May 6, 2011·Plant Physiology·Florian SchröderCarsten Müssig

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