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Related Experiment Videos

Diagravitropism in corn roots.

A C Leopold1, S H Wettlaufer

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

Plant Physiology
|January 1, 1988
PubMed
Summary
This summary is machine-generated.

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Corn roots exhibit diagravitropism, a growth response to gravity. This process, unlike positive gravitropism, shows less dependence on calcium, suggesting distinct signaling pathways in root gravitropism.

Area of Science:

  • Plant biology
  • Root development
  • Gravitropism

Background:

  • Plant roots exhibit gravitropism, orienting growth with respect to gravity.
  • Two types of gravitropism exist: positive (downward) and diagravitropism (horizontal).
  • Understanding the mechanisms of these responses is crucial for plant science.

Purpose of the Study:

  • To compare the gravitropic systems of corn (Zea mays L.) roots.
  • To investigate the role of calcium in diagravitropism versus positive gravitropism.
  • To elucidate the signaling pathways involved in root gravitropism.

Main Methods:

  • Growing Merit corn roots in darkness to induce diagravitropism.
  • Assessing the requirement of the root cap for diagravitropism.
Keywords:
NASA Discipline Number 40-10NASA Discipline Plant BiologyNASA Program Space BiologyNon-NASA Center

Related Experiment Videos

  • Evaluating the effect of calcium chelation (EGTA) and re-addition on root curvature.
  • Comparing the time course and presentation time of diagravitropism and positive gravitropism.

    • Main Results:

    • Diagravitropism, like positive gravitropism, requires the root cap and shares similar timing for curvature onset and presentation.
    • Diagravitropism is insensitive to calcium chelation by EGTA and subsequent calcium re-addition.
    • Positive gravitropism is markedly dependent on calcium, unlike diagravitropism.

    Conclusions:

    • Corn root gravitropism involves a shared sensing system but separate transductive pathways.
    • Diagravitropism utilizes a calcium-independent signaling pathway.
    • Positive gravitropism relies on a calcium-dependent signaling pathway.