Dataset Information


Transcription profiling by array of Arabidopsis after growth in constant white light

ABSTRACT: Most higher organisms, including plants and animals, have developed a time-keeping mechanism that allows them to anticipate daily fluctuations of environmental parameters such as light and temperature. This circadian clock efficiently coordinates plant growth and metabolism with respect to time-of-day by producing self-sustained rhythms of gene expression with an approximately 24-hour period. The importance of these rhythms has in fact been demonstrated in both phytoplankton and higher plants: organisms that have an internal clock period matched to the external environment possess a competitive advantage over those that do not. We used microarrays to identify circadian-regulated genes of Arabidopsis thaliana to elucidate how the clock provides an adaptive advantage by understanding how the clock regulates outputs and determining which pathways and processes may be under circadian control. Experiment Overall Design: Groups of Arabidopsis seedlings were grown in light/dark cycles for 7 d before, transferred to constant light, and after 24 h in constant light 12 samples were harvested at 4-h intervals over the next 44 h for RNA extraction and hybridization on Affymetrix microarrays.

INSTRUMENT(S): 418 [Affymetrix]

ORGANISM(S): Arabidopsis thaliana  

SUBMITTER: Michael F. Covington  

PROVIDER: E-GEOD-8365 | ArrayExpress | 2008-06-17



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The circadian clock regulates auxin signaling and responses in Arabidopsis.

Covington Michael F MF   Harmer Stacey L SL  

PLoS biology 20070801 8

The circadian clock plays a pervasive role in the temporal regulation of plant physiology, environmental responsiveness, and development. In contrast, the phytohormone auxin plays a similarly far-reaching role in the spatial regulation of plant growth and development. Went and Thimann noted 70 years ago that plant sensitivity to auxin varied according to the time of day, an observation that they could not explain. Here we present work that explains this puzzle, demonstrating that the circadian c  ...[more]

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