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

Article Article scientifique Article Adjustment of the PIF7-HFR1 transcriptional module activity controls plant shade adaptation eng 2021 author Paulišić Sandi author Qin Wenting author Arora Veraszto Harshul 926011 author Then Christiane author Alary Benjamin author Nogue Fabien author Tsiantis Miltos author Hothorn Michael 826130 author Martínez-García Jaime F 10.15252/embj.2019104273 0261-4189 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. Dewey 580 45 Département des sciences végétales 163 false 830 Groupe Hothorn EMBO Journal 40 e104273 1623bc08-d074-4179-94a5-3477ade8aa4d Article (Published version) Restricted embj.2019104273.pdf 2975014 application/pdf restrictedAccess Faculté des sciences / Section de biologie / Département des sciences végétales

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Adjustment of the PIF7-HFR1 transcriptional module activity controls plant shade adaptation	EMBO Journal			2021	379	0

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Arora Veraszto, Harshul