Ethylene-independent promotion of photomorphogenesis in the dark by cytokinin requires COP1 and the CDD complex.

ABSTRACT: The transition of skotomorphogenesis to photomorphogenesis is induced by the perception of light, and is characterized by the inhibition of hypocotyl elongation and opening of cotyledons. Although it is known that the plant hormone cytokinin inhibits hypocotyl elongation in dark-grown Arabidopsis plants when applied in high concentrations, it is unclear to what extent this response is the result of cytokinin alone or cytokinin-induced ethylene production. Here, we show that cytokinin-induced inhibition of hypocotyl elongation is largely independent of ethylene and suggest a close connection between the cytokinin two-component system and the light-signaling networks. We show that this cytokinin signal is mainly mediated through the cytokinin receptor ARABIDOPSIS HISTIDINE KINASE3 and the AR

SUBMITTER: Cortleven A 

PROVIDER: S-EPMC6305196 | biostudies-literature | 2019 Jan

REPOSITORIES: biostudies-literature