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Plant Cell, Vol. 12, 1203-1212, July 2000, Copyright © 2000, American Society of Plant Physiologists

Sustained but Not Transient Phytochrome A Signaling Targets a Region of an Lhcb1*2 Promoter Not Necessary for Phytochrome B Action

Pablo D. Cerdána, Roberto J. Stanelonia, Jimena Ortegaa, Matilde M. Bungea, María J. Rodriguez-Batillera, Rodolfo A. Sánchezb, and Jorge J. Casalb
a Instituto de Investigaciones Bioquímicas Fundación Campomar, Av. Patricias Argentinas 435, 1405-Buenos Aires, Argentina
b IFEVA, Facultad de Agronomía, Universidad de Buenos Aires, Av. San Martín 4453, 1417-Buenos Aires, Argentina

Correspondence to: Jorge J. Casal, casal{at}ifeva.edu.ar (E-mail), 5411-4514-8730 (fax)

Current evidence is inconclusive regarding the point of signaling convergence downstream from different members of the phytochrome family. In transgenic Arabidopsis, the activity of a reporter enzyme under the control of the -453 to +67 fragment of an Lhcb1*2 promoter shows very low fluence responses (VLFRs) and high-irradiance responses (HIRs) mediated by phytochrome A and low-fluence responses (LFRs) mediated by phytochrome B. A 5' deletion of the promoter to -134 abolished the HIR without affecting VLFR or LFR. In transgenic tobacco, VLFR and LFR were observed for the -176 to -31 or -134 to -31 fragments of Lhcb1*2 fused to 35S cauliflower mosaic virus minimal promoters, but only the largest fragment showed HIR. We propose that sustained activation of phytochrome A with far-red light initiates a signaling cascade that deviates from phytochrome B signaling and transient phytochrome A signaling and that this divergence extends as far as the Lhcb1*2 promoter.




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