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Related Experiment Videos

Morphogenesis in cucumber seedlings is negatively controlled by gravity.

H Takahashi1, M Kamada, Y Yamazaki

  • 1Institute of Genetic Ecology, Tohoku University, Katahira, Sendai, Japan. hideyuki@ige.tohoku.ac.jp

Planta
|April 6, 2000
PubMed
Summary

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Cucumber seedlings normally grow one peg to shed their seed coat. Under microgravity, they develop two pegs, suggesting gravity suppresses a second peg

Area of Science:

  • Plant morphogenesis
  • Gravitational biology
  • Spaceflight research

Background:

  • Cucurbitaceous plants develop a peg on the hypocotyl-root transition zone for seed coat removal post-germination.
  • Peg formation is crucial for seedling establishment after germination.

Purpose of the Study:

  • To investigate the role of gravity in cucumber (Cucumis sativus L.) peg development.
  • To determine if microgravity influences the number of pegs formed by cucumber seedlings.

Main Methods:

  • Spaceflight experiments were conducted on the STS-95 space shuttle, Discovery.
  • Cucumber seedlings were grown under microgravity conditions.
  • Peg development was observed and quantified.

Main Results:

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  • Cucumber seedlings grown in microgravity developed two pegs symmetrically at the hypocotyl-root transition zone.
  • Seedlings grown under normal gravity conditions developed only one peg.
  • This indicates that gravity normally suppresses the formation of a second peg.

Conclusions:

  • Cucumber seedlings have the inherent ability to develop two pegs.
  • Gravity acts as a negative regulator for peg morphogenesis in cucumber seedlings.
  • The findings suggest a novel mechanism of gravitational control over plant development.