Plant Physiol.
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Plant Physiology 70:1470-1474 (1982)
© 1982 American Society of Plant Biologists

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Articles

Evaluation of H+ Secretion Relative to Zeatin-Induced Growth of Detached Cucumber Cotyledons 1

Cleon W. Ross2 and David L. Rayle

Department of Botany and Plant Pathology, Colorado State University, Fort Collins, Colorado 80523, Department of Botany, San Diego State University, San Diego, California 92182

Cytokinins promote expansion of cotyledons detached from seedlings of more than a dozen species. The zeatin-enhanced expansion of cucumber (Cucumis sativus L. cv Marketer) cotyledons was investigated. In addition, whether acid secretion is involved in wall loosening accompanying such accelerated growth was evaluated. For cotyledons abraded with carborundum or cut into either eight or 18 pieces, we detected no zeatin-enhanced acidification of the growth medium during growth periods of 3 days. Measurements of pH values on each surface of zeatin-treated, abraded cotyledons after 3 days of growth also showed no detectable acidification caused by the hormone. Furthermore, with several buffers at pH values ranging from 5 to 8, growth of nonabraded, abraded, or cut cotyledons with or without zeatin was independent of external pH. However, experiments restricted to about 12 hours indicated that certain acidic buffers enhanced growth of cotyledons cut into 18 pieces. Lastly, concentrations of fusicoccin that caused growth promotion equal to that of zeatin initiated substantial acidification of the medium. Collectively, these data suggest that zeatin-induced expansion of detached cucumber cotyledons is independent of H+ secretion.

2 To whom reprint requests should be addressed.

1 This work was supported by National Science Foundation Grant PCM79-22139 to Colorado State University.






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Copyright © 1982 by the American Society of Plant Biologists