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Springback and diagravitropism in Merit corn roots.

M O Kelly1, A C Leopold

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

Plant Physiology
|June 1, 1992
PubMed
Summary
This summary is machine-generated.

Merit corn roots exhibit diagravitropism and a "springback" phenomenon when gravity is removed. This root behavior, linked to growth response, was absent in orthogravitropic corn and when tropism was enhanced.

Keywords:
NASA Discipline Number 40-50NASA Discipline Plant BiologyNASA Program Space BiologyNon-NASA Center

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Area of Science:

  • Plant biology
  • Plant physiology
  • Gravitropism research

Background:

  • Plant roots exhibit gravitropism, orienting growth in response to gravity.
  • Merit corn roots show diagravitropism (growing at an angle to gravity) in the dark.
  • A phenomenon termed 'springback' (loss of curvature upon stimulus withdrawal) has been observed in these roots.

Purpose of the Study:

  • To investigate the characteristics of root gravitropism in corn.
  • To understand the 'springback' phenomenon in diagravitropic corn roots.
  • To explore factors influencing root curvature and springback.

Main Methods:

  • Observing root growth and curvature in Merit corn under dark conditions.
  • Comparing springback in Merit corn with orthogravitropic corn varieties.
  • Assessing the effect of red light and abscisic acid on tropistic response and springback.

Main Results:

  • Merit corn roots displayed diagravitropism and exhibited springback.
  • Springback was not observed in orthogravitropic corn varieties.
  • Enhanced tropistic responses (via red light or abscisic acid) in Merit corn roots did not show springback.

Conclusions:

  • Springback in corn roots appears specifically linked to diagravitropism.
  • The springback phenomenon may be associated with a weaker growth response in diagravitropic roots.
  • Gravitropism and associated growth responses in corn roots are complex and influenced by multiple factors.