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Plant Physiology 68:1024-1026 (1981)
© 1981 American Society of Plant Biologists

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Phytochrome Control of Maize Coleoptile Section Elongation: the Role of Cell Wall Extensibility 1

Timothy J. Warner and James D. Ross

Department of Botany, University of Reading, Whiteknights, Reading RG6 2AS England, Plant Science Laboratories, University of Reading, Whiteknights, Reading RG6 2AS England

Maize (Zea mays) coleoptile section cell wall extensibility was found to be stimulated by red light. This stimulation was largely removed by simultaneous or immediately subsequent far-red treatment. Qualitatively similar patterns of response occurred at 0 C and 20 C. Plastic extensibility responded more than elastic extensibility after red light treatment. Red-induced extensibility increases were detectable by 20 minutes after irradiation, and extensibility continued to increase up to at least 1 hour after irradiation. The kinetics of escape from far-red reversibility indicate that the initial events leading to this phenomenon are among the fastest known phytochrome responses.

1 This work was supported in part by a grant (to T. J. W.) from the Science Research Council (Cooperative Awards in Science and Engineering Award in conjunction with Tate and Lyle Group Research Limited).






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Copyright © 1981 by the American Society of Plant Biologists