Short Term Phytochrome Control of Oat Coleoptile and Pea Epicotyl Growth

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Abstract
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 min of red light was found to promote growth after a latent period of 46 min. 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 min light. The growth of the intact pea third internode (and excised segments) was strongly inhibited by red light, with a latent period of 80 min. This effect was far red-reversible and far red and blue light caused only a slight inhibition of growth.