COP1 destabilizes DELLA proteins in Arabidopsis
- Blanco Touriñán, Noel
- Legris, Martina
- Minguet, Eugenio G.
- Costigliolo Rojas, María Cecilia
- Nohales, María A.
- Iniesto, Elisa
- García León, Marta
- Pacín, Manuel
- Heucken, Nicole
- Blomeier, Tim
- Locascio, Antonella
- Cerný, Martin
- Esteve Bruna, David
- Díez Díaz, Mónica
- Brzobohatý, Bretislav
- Frerigmann, Henning
- Zurbriggen, Matías D.
- Kay, Steve A.
- Rubio, Vicente
- Blázquez, Miguel A.
- Casal, Jorge José
- Alabadí, David
DOIAbstract
DELLA transcriptional regulators are central components in the control of plant growth responses to the environment. This control is considered to be mediated by changes in the metabolism of the hormones gibberellins (GAs), which promote the degradation of DELLAs. However, here we show that warm temperature or shade reduced the stability of a GA-insensitive DELLA allele in Arabidopsis thaliana. Furthermore, the degradation of DELLA induced by the warmth preceded changes in GA levels and depended on the E3 ubiquitin ligase CONSTITUTIVELY PHOTOMORPHOGENIC1 (COP1). COP1 enhanced the degradation of normal and GAinsensitive DELLA alleles when coexpressed in Nicotiana benthamiana. DELLA proteins physically interacted with COP1 in yeast, mammalian...
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