Journal
EMBO JOURNAL
Volume 40, Issue 1, Pages -Publisher
WILEY
DOI: 10.15252/embj.2019104273
Keywords
Cardamine hirsuta; HFR1; PIFs; shade avoidance; shade tolerance
Categories
Funding
- Agencia d'Ajuts Universitaris i de Recerca (AGAUR-Generalitat de Catalunya, FI programme)
- predoctoral Chinese Scholarship Council (CSC) fellowship
- European Commission
- CRAG short-term fellowship
- MINECO [SEV-2015-0533]
- CERCA Programme/Generalitat de Catalunya
- LabEx Saclay Plant Sciences-SPS [ANR-10-LABX-0040-SPS]
- BBSRC [BB/H006974/1]
- Max Planck Society
- MINECO-FEDER [BIO2017-85316-R]
- AGAUR [2017-SGR1211]
- AGAUR (Xarba)
- BBSRC [BB/H006974/1] Funding Source: UKRI
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The study reveals that the HFR1 protein in Cardamine hirsuta is more stable than in Arabidopsis thaliana, likely due to its lower binding affinity to COP1, enhancing its biological activity. This leads to a different balance of the PIF-HFR1 module in C. hirsuta, reducing PIF activity and attenuating other PIF-mediated responses.
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.
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