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Effects of shoot inversion on stem structure in Pharbitis nil.

T K Prasad1, F D Sack, M G Cline

  • 1Department of Botany, The Ohio State University, Columbus 43210, USA.

American Journal of Botany
|November 1, 1988
PubMed
Summary

Shoot inversion in Pharbitis nil plants increased stem diameter by affecting cell number and size, particularly in the pith. This treatment also inhibited stem elongation, suggesting an ethylene-mediated effect on cell dimensions.

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Area of Science:

  • Plant Biology
  • Plant Physiology
  • Developmental Biology

Background:

  • Plant shoot orientation is crucial for development.
  • Gravitropism influences plant growth and structure.
  • Hormonal regulation, like ethylene, plays a role in plant responses.

Purpose of the Study:

  • To investigate the impact of shoot inversion on stem structure in Pharbitis nil.
  • To analyze cellular and tissue-level changes in response to altered orientation.
  • To explore the potential role of ethylene in observed structural modifications.

Main Methods:

  • Pharbitis nil shoots were inverted for 72 hours.
  • Stem structure was analyzed by measuring cell number, cell length, and cross-sectional areas.
  • Microscopic examination assessed cell wall thickness.
Keywords:
NASA Discipline Number 40-10NASA Discipline Plant BiologyNASA Program Space BiologyNon-NASA Center

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Main Results:

  • Shoot inversion led to increased stem diameter, primarily due to greater pith cell number and cross-sectional area.
  • Vascular tissue also contributed secondarily to the increased stem diameter.
  • Stem elongation was inhibited, accompanied by a significant decrease in pith cell length.

Conclusions:

  • Shoot inversion alters stem structure in Pharbitis nil, affecting cell dimensions and tissue organization.
  • The observed changes in cell number and length are consistent with ethylene's influence on plant development.
  • Ethylene likely mediates the effects of shoot inversion on stem growth and structure, especially within the pith.