A subset of Arabidopsis AP2 transcription factors mediates cytokinin responses in concert with a two-component pathway.

ABSTRACT: The plant hormone cytokinin regulates numerous growth and developmental processes. A signal transduction pathway for cytokinin has been elucidated that is similar to bacterial two-component phosphorelays. In Arabidopsis, this pathway is comprised of receptors that are similar to sensor histidine kinases, histidine-containing phosphotransfer proteins, and response regulators (ARRs). There are two classes of response regulators, the type-A ARRs, which act as negative regulators of cytokinin responses, and the type-B ARRs, which are transcription factors that play a positive role in mediating cytokinin-regulated gene expression. Here we show that several closely related members of the Arabidopsis AP2 gene family of unknown function are transcriptionally up-regulated by cytokinin through this

SUBMITTER: Rashotte AM 

PROVIDER: S-EPMC1544176 | biostudies-literature | 2006 Jul

REPOSITORIES: biostudies-literature