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PLANT PHYSIOLOGY , Vol 110, Issue 1 155-162, Copyright © 1996 by American Society of Plant Biologists
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DEVELOPMENT AND GROWTH REGULATION |
Phytochrome A Regulates Red-Light Induction of Phototropic Enhancement in Arabidopsis
B. M. Parks, P. H. Quail and R. P. Hangarter
Department of Plant Biology, The Ohio State University, Columbus, Ohio 43210 (B.M.P., R.P.H.)
Phytochrome A (phyA) and phytochrome B photoreceptors have distinct roles
in the regulation of plant growth and development. Studies using specific
photomorphogenic mutants and transgenic plants overexpressing phytochrome
have supported an evolving picture in which phyA and phytochrome B are
responsive to continuous far-red and red light, respectively.
Photomorphogenic mutants of Arabidopsis thaliana that had been selected for
their inability to respond to continuous irradiance conditions were tested
for their ability to carry out red-light-induced enhancement of
phototropism, which is an inductive phytochrome response. We conclude that
phyA is the primary photoreceptor regulating this response and provide
evidence suggesting that a common regulatory domain in the phyA polypeptide
functions for both high-irradiance and inductive phytochrome responses.
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