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Plant Physiology 63:440-443 (1979)
© 1979 American Society of Plant Biologists

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Articles

Short Term Phytochrome Control of Oat Coleoptile and Pea Epicotyl Growth 1

Carl S. Pike, Alice E. Richardson, Ellen R. Weiss2, J. Marc Aynardi3 and Jane Grushow

a Department of Biology, Franklin and Marshall College, Lancaster, Pennsylvania 17604

Continuous recordings of the effect of light on oat (Avena sativa L. cv. Victory) coleoptile and pea (Pisum sativum L. cv. Alaska) epicotyl growth were made. Using a single excised coleoptile 10 minutes of red light was found to promote growth after a latent period of 46 minutes. The stimulation was transient and was not far red-reversible. Blue and far red light also promoted growth with similar kinetics. The action of continuous red or far red light was similar to that of 10-minute light. The growth of the intact pea third internode (as well as excised segments) was strongly inhibited by red light, with a latent period of 80 minutes. This effect was far red-reversible, and far red and blue light caused only a slight inhibition of growth.

2 Present address: National Cancer Institute, Bethesda, Maryland 20014.

3 Present address: School of Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania 15213.

1 Supported in part by National Science Foundation Grant PCM 75-06450.






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Copyright © 1979 by the American Society of Plant Biologists