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Microgravity effects on plant growth and lignification.

J R Cowles1, R Lemay, G Jahns

  • 1University of Houston, TX 77004, USA.

Astrophysical Letters & Communications
|January 1, 1988
PubMed
Summary
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Gravity influences plant growth. Space experiments showed microgravity significantly slowed lignin formation in mung bean, oat, and pine seedlings, impacting plant structure and development.

Area of Science:

  • Plant Biology
  • Space Biology
  • Biochemistry

Background:

  • Lignin is a crucial plant cell wall component supporting vertical growth in gravity.
  • Previous research suggests gravity influences lignification processes in plants.

Purpose of the Study:

  • To investigate the impact of microgravity on lignin formation in young plant seedlings.
  • To assess the effects of microgravity on overall seedling growth and development.

Main Methods:

  • Mung bean, oat, and pine seeds were germinated and grown under microgravity conditions aboard Spacelab II.
  • Seedling growth, morphology, and lignin content were compared to 1 g control groups.

Main Results:

  • Microgravity significantly reduced the rate of lignin formation across all three plant species.
Keywords:
NASA Discipline Number 00-00NASA Discipline Plant BiologyNASA Program FlightNon-NASA Center

Related Experiment Videos

  • Mung bean and oat seedlings exhibited slower growth and orientation issues in space.
  • Pine seedlings showed comparable growth to 1 g controls, but with reduced lignification.

    • Conclusions:

    • Direct evidence confirms that microgravity slows down lignification in plants.
    • Gravity plays a significant role in regulating plant lignification and development.