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PLANT PHYSIOLOGY , Vol 103, Issue 1 15-19, Copyright © 1993 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Genetic Evidence That the Red-Absorbing Form of Phytochrome B Modulates Gravitropism in Arabidopsis thaliana
E. Liscum and R. P. Hangarter
Department of Plant Biology, The Ohio State University, Columbus, Ohio 43210
Hypocotyls of dark-grown Arabidopsis seedlings exhibit strong negative
gravitropism, whereas in red light, gravitropism is strongly reduced.
Red/far-red light-pulse experiments and analysis of specific
phytochrome-deficient mutants indicate that the red-absorbing (Pr) form of
phytochrome B regulates normal hypocotyl gravitropism in darkness, and
depletion of Pr by photoconversion to the far-red-absorbing form attenuates
hypocotyl gravitropism. These studies provide genetic evidence that the Pr
form of phytochrome has an active function in plant development.
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