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[Woody plant and gravity].

T Nakamura1, M Yoshida

  • 1Faculty of Science, Japan Women's Univ, Tokyo. teruko-n@jwu.ac.jp

Uchu Seibutsu Kagaku
|October 24, 2001
PubMed
Summary

Gravity significantly influences woody plant growth, affecting stem orientation and secondary xylem formation. Reduced gravity in space experiments may alter plant development and tissue differentiation.

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Area of Science:

  • Plant Biology
  • Gravitational Biology
  • Wood Science

Context:

  • Gravity is a critical environmental factor influencing plant growth and development on Earth.
  • Woody plants, particularly broad-leaved trees, exhibit gravitropism, a response to gravitational forces.
  • Tension wood formation in secondary xylem is a known mechanism for negative gravitropism in tilted trees.

Purpose:

  • To review the effects of gravity on the growth of woody plants, focusing on broad-leaved trees.
  • To explore the role of secondary xylem formation in stem attitude control and morphogenesis under gravity.
  • To highlight recent findings on microgravity effects on Japanese cherry tree seedlings and identify knowledge gaps.

Summary:

  • Gravity influences the orientation and structural development of woody plants.
  • Tension wood, a type of secondary xylem, mediates negative gravitropism, enabling upright growth.
  • Simulated microgravity decreased secondary xylem formation and inhibited fiber cell differentiation in cherry tree seedlings, suggesting gravity's crucial role.

Impact:

  • Understanding gravity's role is vital for predicting plant development in terrestrial and space environments.
  • This research underscores the importance of secondary xylem in plant structural integrity and gravitropic responses.
  • Further space experiments are needed to elucidate the mechanisms of gravity perception and signal transduction in woody plants.

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