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Plant Physiology 67:355-357 (1981)
© 1981 American Society of Plant Biologists

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Articles

Phytochrome Control of Maize Coleoptile Section Elongation 1

A RAPID LOSS OF PHOTOREVERSIBILITY

Timothy J. Warner, James D. Ross and James Coombs2

Department of Botany, University of Reading, Whiteknights, Reading, RG2 6AS, United Kingdom, Plant Science Laboratories, University of Reading, Whiteknights, Reading, RG2 6AS, United Kingdom, 2 Philip Lyle Memorial Research Laboratory, University of Reading, Whiteknights, Reading, RG2 6AS, United Kingdom

A rapid loss of far red light (FR) reversibility of red-light (R) stimulated elongation of maize coleoptile sections was observed. Reversal was not possible when the interval between R and FR treatment was greater than 45 seconds. Most of the R-stimulated elongation occurred during the first 15 hours after irradiation.

Exogenous gibberellic acid did not alter the time course of R/FR reversibility loss. These results are interpreted as indicating independence of R- and gibberellic acid-stimulated elongation in this system.

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, in conjunction with Tate and Lyle, Group Research and Development Ltd., University of Reading, Reading, United Kingdom).






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Copyright © 1981 by the American Society of Plant Biologists