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Variable Cell Growth Yields Reproducible OrganDevelopment through Spatiotemporal Averaging.

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Organ size precision relies on averaging cell variability. Mutations disrupting this process, like in FtsH4, alter cell growth and reactive oxygen species (ROS) levels, impacting organ uniformity.

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Area of Science:

  • Plant biology
  • Cellular biology
  • Developmental biology

Background:

  • Organ size and shape are remarkably consistent despite cellular variability.
  • Understanding the mechanisms ensuring developmental precision is crucial.

Purpose of the Study:

  • To identify genetic factors controlling organ size and shape uniformity in Arabidopsis.
  • To elucidate the cellular mechanisms underlying developmental precision.

Main Methods:

  • Genetic screen for disrupted sepal size and shape uniformity in Arabidopsis thaliana.
  • Live imaging to observe cellular growth dynamics.
  • Analysis of reactive oxygen species (ROS) accumulation.

Main Results:

  • Mutations in the mitochondrial i-AAA protease FtsH4 disrupt sepal uniformity.
  • ftsh4 mutants exhibit reduced neighboring cell growth variability.
  • Spatiotemporal averaging of cellular variability in wild-type sepals ensures organ shape precision.
  • Increased ROS accumulation in ftsh4 mutants disrupts organ size consistency.
  • ROS act as endogenous signals to terminate organ growth in wild-type sepals.

Conclusions:

  • Spatiotemporal averaging of cellular variability is essential for precise organ size determination.
  • Mitochondrial FtsH4 and ROS signaling play critical roles in regulating organ development and uniformity.