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Plant Physiology 66:433-437 (1980)
© 1980 American Society of Plant Biologists

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Evidence that Auxin-induced Growth of Soybean Hypocotyls Involves Proton Excretion 1

David L. Rayle and Robert E. Cleland

Botany Department, San Diego State University, San Diego, California 92182, Botany Department, University of Washington, Seattle, Washington 98195

The role of H+ excretion in auxin-induced growth of soybean hypocotyl tissues has been investigated, using tissues whose cuticle was rendered permeable to protons or buffers by scarification (scrubbing). Indoleacetic acid induces both elongation and H+ excretion after a lag of 10 to 12 minutes. Cycloheximide inhibits growth and causes the tissues to remove protons from the medium. Neutral buffers (pH 7.0) inhibit auxin-induced growth of scrubbed but not intact sections; the inhibition increases as the buffer strength is increased. Both live and frozen-thawed sections, in the absence of auxin, extend in response to exogenously supplied protons. Fusicoccin induces both elongation and H+ excretion at rates greater than does auxin. These results indicate that H+ excretion is involved in the initiation of auxin-induced elongation in soybean hypocotyl tissue.

1 This research was supported by National Science Foundation Grant PCM77-02933 (to D.L.R.) and by Department of Energy Contract EY-76-S-06-2225 (to R.E.C.).




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 Plant Cell PhysiolHome page
N. Ezaki, N. Kido, K. Takahashi, and K. Katou
The Role of Wall Ca2+ in the Regulation of Wall Extensibility During the Acid-induced Extension of Soybean Hypocotyl Cell Walls
Plant Cell Physiol., November 1, 2005; 46(11): 1831 - 1838.
[Abstract] [Full Text] [PDF]


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Copyright © 1980 by the American Society of Plant Biologists