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Plant development regulated by cytokinin sinks.

Evelyne Zürcher1, Jingchun Liu1, Martin di Donato2

  • 1Zürich-Basel Plant Science Center, Department of Plant and Microbial Biology, University of Zürich, 8008 Zürich, Switzerland.

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Summary

PURINE PERMEASE 14 (PUP14) acts as a cytokinin transporter, controlling plant development. Loss of PUP14 leads to abnormal growth by disrupting cytokinin signaling patterns essential for morphogenesis.

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Area of Science:

  • Plant biology
  • Developmental biology
  • Molecular signaling

Background:

  • Morphogenetic signals guide multicellular organism patterning.
  • Cytokinins are mobile plant hormones crucial for development.
  • Cytokinin perception is restricted to specific cell populations.

Purpose of the Study:

  • To investigate the role of PURINE PERMEASE 14 (PUP14) in regulating cytokinin signaling.
  • To understand how PUP14 constrains cytokinin responses during plant development.
  • To elucidate the mechanism by which PUP14 influences plant morphogenesis.

Main Methods:

  • Analysis of PUP14 expression patterns in Arabidopsis.
  • Phenotypic analysis of pup14 loss-of-function mutants.
  • Protein localization studies of PUP14.
  • Cytokinin transport assays.

Main Results:

  • PUP14 expression inversely correlated with cytokinin signaling.
  • Loss of PUP14 function resulted in ectopic cytokinin signaling and aberrant morphogenesis in embryos, roots, and shoot apical meristems.
  • PUP14 localized to the plasma membrane and imported cytokinins.
  • PUP14 functions as a cytokinin sink, depleting extracellular hormone levels.

Conclusions:

  • PUP14 is a critical regulator of cytokinin signaling.
  • PUP14-mediated cytokinin sinks shape the signaling landscape.
  • Spatiotemporal control of cytokinin signaling by PUP14 is essential for land plant morphogenesis.