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CIRCADIAN CLOCK ASSOCIATED 1 gates morning phased auxin response in Arabidopsis thaliana.

Biochem Biophys Res Commun. 2020 Jul 05;527(4):935-940. Epub 2020 May 16
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摘要


Circadian clock controls plant behaviors to anticipate day-night switch and keeps plant fitness. Here, we reported that plant response to auxin is also strictly governed by clock. The amplitude of auxin-responsive gene expressions gradually declined from morning to the dusk, and then enhanced from dusk to dawn. Plants with defects in both CIRCADIAN CLOCK ASSOCIATED1 (CCA1) and its closest homologue LATE ELONGATED HYPOCOTYL (LHY) (cca1 lhy) showed comparable responses to auxin at different time points in consecutive days, suggesting that CCA1 and LHY were required for gating auxin responses. Moreover, CCA1/LHY physically interacted with the core transcriptional repressors (Aux/IAA proteins), which might further modulate plant sensitivity to auxin. Taken together, we demonstrate that the central morning phased circadian oscillator CCA1 plays a pivotal role in gating auxin response.

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基因功能


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