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TMK-based cell-surface auxin signalling activates cell-wall acidification.

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Transmembrane kinases (TMKs) directly activate plasma membrane H+-ATPases, a key step in auxin-induced plant cell expansion. This discovery clarifies how auxin signaling triggers cell wall acidification and growth in plants.

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Area of Science:

  • Plant Biology
  • Molecular Signaling
  • Cellular Physiology

Background:

  • The phytohormone auxin regulates crucial plant processes, including cell expansion.
  • The acid growth hypothesis explains auxin-stimulated cell expansion via cell-wall acidification, but the underlying mechanism is unclear.
  • Auxin activates plasma membrane H+-ATPases, yet the activation process remains poorly understood.

Purpose of the Study:

  • To elucidate the mechanism by which auxin activates plasma membrane H+-ATPases.
  • To identify the signaling pathway connecting auxin perception to H+-ATPase activation.
  • To investigate the role of transmembrane kinases (TMKs) in auxin-mediated cell expansion.

Main Methods:

  • Genetic, biochemical, and molecular analyses in Arabidopsis.
  • Investigated interactions between TMKs and H+-ATPases using co-immunoprecipitation.
  • Assessed TMK-dependent phosphorylation of H+-ATPases and measured hypocotyl cell elongation.

Main Results:

  • TMK auxin-signaling proteins directly interact with plasma membrane H+-ATPases.
  • Auxin triggers rapid TMK-H+-ATPase interactions and TMK-dependent phosphorylation of H+-ATPases.
  • TMKs are essential for auxin-induced H+-ATPase activation, cell-wall acidification, and hypocotyl cell elongation.

Conclusions:

  • TMKs directly phosphorylate and activate plasma membrane H+-ATPases, establishing a direct link in auxin signaling.
  • This TMK-based pathway is crucial for auxin-induced apoplastic acidification and plant cell expansion.
  • The findings reveal TMK-based cell surface signaling as a key regulator of auxin's effects on plant growth.