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Related Experiment Videos

Springback in root gravitropism.

A C Leopold1, S H Wettlaufer

  • 1Boyce Thompson Institute, Cornell University, Ithaca, New York 14853.

Plant Physiology
|January 1, 1989
PubMed
Summary
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Corn roots exhibit "springback," a rapid loss of gravitropic curvature after gravistimulus removal. This phenomenon is independent of the root cap and auxin transport, suggesting a memory-based response.

Area of Science:

  • Plant biology
  • Plant physiology
  • Developmental biology

Background:

  • Gravitropism is a crucial plant growth response to gravity.
  • Understanding the mechanisms underlying gravitropism is essential for plant science.
  • Corn roots (Zea mays L.) are a model system for studying gravitropism.

Purpose of the Study:

  • To investigate the phenomenon of "springback" in corn roots.
  • To determine the factors influencing the loss of gravitropic curvature after gravistimulus removal.
  • To elucidate the underlying mechanisms of this rapid curvature change.

Main Methods:

  • Gravistimulation and withdrawal experiments on Merit corn roots.
  • Observation of root curvature changes over time.
  • Testing the effects of root cap presence/absence.
Keywords:
NASA Discipline Number 29-20NASA Discipline Plant BiologyNASA Program Space BiologyNon-NASA Center

Related Experiment Videos

  • Assessing the impact of auxin transport inhibitors and added auxin.
  • Utilizing clinostat treatment to neutralize gravistimulation.

    • Main Results:

    • Gravitropic curvature is rapidly lost (1-10 minutes) after gravistimulus withdrawal, termed "springback."
    • Springback occurs irrespective of the root cap's presence or absence.
    • The phenomenon is insensitive to auxin transport inhibitors (e.g., 2,3,5-triiodobenzoic acid) and exogenous auxin (2,4-dichlorophenoxyacetic acid).
    • Clinostat treatment during germination prevents springback, indicating a role for prior gravistimulation.

    Conclusions:

    • Springback in corn roots is a rapid response to the withdrawal of gravistimulus.
    • The mechanism is not directly mediated by auxin transport or the root cap.
    • The prevention of springback by clinostat treatment suggests a "memory" effect from prior gravistimulation.