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Genetic Interactions between Phytochrome A, Phytochrome B, and Cryptochrome 1 during Arabidopsis Development1

Michael M. Neff and Joanne Chory*

Plant Biology Laboratory (M.M.N., J.C.) and Howard Hughes Medical Institute (J.C.), The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, California 92037

Single, double, and triple null combinations of Arabidopsis mutants lacking the photoreceptors phytochrome (phy) A (phyA-201), phyB (phyB-5), and cryptochrome (cry) 1 (hy4-2.23n) were examined for de-etiolation responses in high-fluence red, far-red, blue, and broad-spectrum white light. Cotyledon unhooking, unfolding, and expansion, hypocotyl growth, and the accumulation of chlorophylls and anthocyanin in 5-d-old seedlings were measured under each light condition and in the dark. phyA was the major photoreceptor/effector for most far-red-light responses, although phyB and cry1 modulated anthocyanin accumulation in a phyA-dependent manner. phyB was the major photoreceptor in red light, although cry1 acted as a phyA/phyB-dependent modulator of chlorophyll accumulation under these conditions. All three photoreceptors contributed to most blue light deetiolation responses, either redundantly or additively; however, phyB acted as a modulator of cotyledon expansion dependent on the presence of cry1. As reported previously, flowering time in long days was promoted by phyA and inhibited by phyB, with each suppressing the other's effect. In addition to the effector/modulator relationships described above, measurements of hypocotyls from blue-light-grown seedlings demonstrated phytochrome activity in blue light and cry1 activity in a phyAphyB mutant background.

1   This work was supported by a grant from the National Institutes of Health (no. RO1GM52413 to J.C.). J.C. is an Associate Investigator of the Howard Hughes Medical Institute. M.M.N. was supported by National Research Service Award postdoctoral fellowship no. GM17577.
*   Corresponding author; e-mail chory{at}salk.edu; fax 1-619-558-6379.

Plant Physiol. (1998) 118: 27-35
Copyright Clearance Center:   0032-0889/98/118//09
© 1998 American Society of Plant Physiologists




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