Journal
DEVELOPMENTAL CELL
Volume 21, Issue 4, Pages 796-804Publisher
CELL PRESS
DOI: 10.1016/j.devcel.2011.08.014
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Funding
- ERC [ERC-2007-Stg-207362-HCPO]
- Austrian Science Fund RAT [P21533]
- GA ASCR [IAA601630703, MSM0021622415]
- Ministry of Education of the Czech Republic [LC06034, MSM 0021620858]
- MEXT [23012026]
- Austrian Science Fund (FWF) [P21533] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 21533] Funding Source: researchfish
- Grants-in-Aid for Scientific Research [23012026] Funding Source: KAKEN
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Cytokinin is an important regulator of plant growth and development. In Arabidopsis thaliana, the two-component phosphorelay mediated through a family of histidine kinases and response regulators is recognized as the principal cytokinin signal transduction mechanism activating the complex transcriptional response to control various developmental processes. Here, we identified an alternative mode of cytokinin action that uses endocytic trafficking as a means to direct plant organogenesis. This activity occurs downstream of known cytokinin receptors but through a branch of the cytokinin signaling pathway that does not involve transcriptional regulation. We show that cytokinin regulates endocytic recycling of the auxin efflux carrier PINFORMED1 (PIN1) by redirecting it for lytic degradation in vacuoles. Stimulation of the lytic PIN1 degradation is not a default effect for general downregulation of proteins from plasma membranes, but a specific mechanism to rapidly modulate the auxin distribution in cytokinin-mediated developmental processes.
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