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Autotropism, automorphogenesis, and gravity.

B Stankovic1, D Volkmann, F D Sack

  • 1Dept of Plant Biology, Ohio State Univ., Columbus 43210, USA.

Physiologia Plantarum
|September 7, 2001
PubMed
Summary
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Organ straightening during gravitropism is a complex growth adjustment, not autotropism. Autotropism specifically refers to straightening after the gravity vector is removed or randomized.

Area of Science:

  • Plant biology
  • Gravitropism research
  • Developmental biology

Background:

  • Organ straightening during gravitropism is poorly understood.
  • Related phenomena are described by overlapping terms like autotropism and automorphogenesis.
  • Existing terminology lacks precise definitions regarding gravitropism.

Purpose of the Study:

  • To critically review terms associated with organ straightening and gravitropism.
  • To clarify the definition and application of "autotropism".
  • To distinguish between gravitropic straightening and other forms of organ curvature.

Main Methods:

  • Literature review of historical and current research on gravitropism and related phenomena.
  • Critical analysis of terminology based on observed plant responses.
Keywords:
NASA Discipline Plant BiologyNon-NASA Center

Related Experiment Videos

  • Comparison of organ straightening during gravitropism versus post-stimulus conditions.

    • Main Results:

    • Organ straightening during gravitropism is a complex growth adjustment, not a tropism.
    • The term "autotropism" should be reserved for straightening after gravity vector randomization (clinostat, microgravity).
    • Automorphogenesis is best suited for curvatures arising from internal morphological relationships.

    Conclusions:

    • Precise terminology is crucial for understanding plant gravitropism.
    • Revising the definition of autotropism enhances clarity in plant science.
    • Distinguishing between gravitropic and non-gravitropic straightening is essential.