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Related Experiment Videos

Gravity sensing and signaling.

Miyo Terao Morita1, Masao Tasaka

  • 1Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan. mimorita@bs.naist.jp

Current Opinion in Plant Biology
|October 20, 2004
PubMed
Summary

Plant gravitropism, the growth response to gravity, is explained by amyloplast movement within specialized cells. This movement triggers signaling pathways leading to differential auxin distribution, guiding root and shoot growth.

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Area of Science:

  • Plant biology
  • Plant physiology
  • Developmental biology

Background:

  • Gravitropism is a fundamental plant growth response crucial for orientation.
  • Two key hypotheses, the starch-statolith and Cholodney-Went hypotheses, have long been proposed to explain gravitropism.
  • Recent molecular studies offer evidence supporting these classical theories.

Purpose of the Study:

  • To review and synthesize recent molecular findings on plant gravitropism.
  • To highlight the role of amyloplasts in gravity perception.
  • To discuss the signaling events linking amyloplast movement to auxin redistribution.

Main Methods:

  • Review of recent molecular and genetic studies on gravitropism.
  • Analysis of evidence supporting the starch-statolith and Cholodney-Went hypotheses.

Related Experiment Videos

  • Synthesis of proposed intracellular signaling pathways.

    • Main Results:

    • Molecular evidence supports the starch-statolith hypothesis, implicating amyloplasts in gravity sensing.
    • Amyloplasts, moving within statocytes along the gravity vector, are the likely initial trigger.
    • Several signaling events downstream of amyloplast movement are proposed to cause differential auxin distribution.

    Conclusions:

    • Amyloplasts are central to gravity perception in plants.
    • The movement of statoliths initiates a signaling cascade.
    • This cascade ultimately leads to the differential auxin distribution that directs gravitropic growth in roots and shoots.