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Related Experiment Videos

Rapid Auxin-induced Decrease in Free Space pH and Its Relationship to Auxin-induced Growth in Maize and Pea.

M Jacobs1, P M Ray

  • 1Department of Biological Sciences, Stanford University, Stanford, California 94305.

Plant Physiology
|August 1, 1976
PubMed
Summary

Plant hormone auxin rapidly lowers the pH of plant tissues, correlating with cell elongation. This supports the acid growth hypothesis for auxin action in pea and maize.

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Area of Science:

  • Plant Physiology
  • Molecular Biology

Background:

  • Auxin is a key plant hormone regulating growth and development.
  • The acid growth hypothesis proposes auxin stimulates cell elongation via proton secretion.

Purpose of the Study:

  • To investigate the effect of auxin on free space pH.
  • To correlate changes in pH with auxin-stimulated elongation in plant tissues.

Main Methods:

  • Utilized a pH microelectrode to measure free space pH in pea and maize tissues.
  • Measured auxin-stimulated elongation in the same plant tissue segments.

Main Results:

  • Auxin induced a rapid decrease in free space pH in both pea and maize tissues.
  • Observed a temporal correlation between pH decrease and cell elongation.

Related Experiment Videos

  • Auxin analogs that do not stimulate elongation also did not alter pH.

    • Conclusions:

    • Findings support the acid secretion theory of auxin action.
    • Demonstrates a direct link between auxin-induced pH changes and stimulated elongation.