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Effect of Inversion on Growth and Movement of Indole-3-acetic Acid in Coleoptiles.

C H Little1, M H Goldsmith

  • 1School of Forestry, Yale University, New Haven, Connecticut 06520.

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This summary is machine-generated.

Plant orientation affects growth. Inverting coleoptile sections inhibits longitudinal growth by disrupting basipetal auxin transport, which is metabolically dependent.

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Area of Science:

  • Plant Physiology
  • Gravitropism Studies
  • Auxin Transport Mechanisms

Background:

  • Plant organs exhibit directional growth in response to gravity (gravitropism).
  • Auxin (indole-3-acetic acid) is a key plant hormone regulating growth and directional movement within plant tissues.

Purpose of the Study:

  • To investigate the impact of a 180-degree inversion on longitudinal growth and auxin movement in Avena sativa and Zea mays coleoptiles.
  • To determine if gravity or metabolic processes are responsible for altered auxin transport upon inversion.

Main Methods:

  • Utilized intact and decapitated coleoptile sections of Avena sativa and Zea mays.
  • Applied 14C-labeled indole-3-acetic acid (IAA) to study acropetal and basipetal movement.
  • Conducted experiments under both aerobic and anaerobic conditions to differentiate metabolic roles.

Main Results:

  • Inversion significantly inhibited longitudinal growth in both intact and decapitated coleoptile sections.
  • Under aerobic conditions, inversion inhibited basipetal auxin transport while promoting acropetal transport.
  • Anaerobic conditions abolished the effect of inversion on auxin movement, indicating a metabolic dependence.

Conclusions:

  • Inversion inhibits growth by impeding metabolically dependent basipetal auxin transport.
  • The observed promotion of acropetal auxin movement is a consequence of inhibited basipetal transport.
  • Gravity's direct physical effect is not the primary cause of inhibited basipetal auxin movement upon inversion.