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Journal Articles EMBO Journal Year : 2021

Adjustment of the PIF7‐HFR1 transcriptional module activity controls plant shade adaptation

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Abstract

Shade caused by the proximity of neighboring vegetation triggers a set of acclimation responses to either avoid or tolerate shade. Comparative analyses between the shade-avoider Arabidopsis thaliana and the shade-tolerant Cardamine hirsuta revealed a role for the atypical basic-helix-loop-helix LONG HYPOCOTYL IN FR 1 (HFR1) in maintaining the shade tolerance in C. hirsuta, inhibiting hypocotyl elongation in shade and constraining expression profile of shade-induced genes. We showed that C. hirsuta HFR1 protein is more stable than its A. thaliana counterpart, likely due to its lower binding affinity to CONSTITUTIVE PHOTOMORPHOGENIC 1 (COP1), contributing to enhance its biological activity. The enhanced HFR1 total activity is accompanied by an attenuated PHYTOCHROME INTERACTING FACTOR (PIF) activity in C. hirsuta. As a result, the PIF-HFR1 module is differently balanced, causing a reduced PIF activity and attenuating other PIF-mediated responses such as warm temperature-induced hypocotyl elongation (thermomorphogenesis) and dark-induced senescence. By this mechanism and that of the already-known of phytochrome A photoreceptor, plants might ensure to properly adapt and thrive in habitats with disparate light amounts.

Dates and versions

hal-03726750 , version 1 (18-07-2022)

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Sandi Paulišić, Wenting Qin, Harshul Arora Verasztó, Christiane Then, Benjamin Alary, et al.. Adjustment of the PIF7‐HFR1 transcriptional module activity controls plant shade adaptation. EMBO Journal, 2021, 40 (1), ⟨10.15252/embj.2019104273⟩. ⟨hal-03726750⟩
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