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Plant Physiol, May 2000, Vol. 123, pp. 235-242

fhy3-1 Retains Inductive Responses of Phytochrome A1

Marcelo J. Yanovsky,2 Garry C. Whitelam, and Jorge J. Casal*

I.F.E.V.A., Facultad de Agronomía, Universidad de Buenos Aires, Avenida San Martín 4453, 1417-Buenos Aires, Argentina (M.J.Y., J.J.C.); and Department of Biology, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom (G.C.W.)

The fhy3 mutation of Arabidopsis impairs phytochrome A (phyA)-mediated inhibition of hypocotyl growth without affecting the levels of phyA measured spectrophotometrically or immunochemically. We investigated whether the fhy3-1 mutation has similar effects on very low fluence responses (VLFR) and high irradiance responses (HIR) of phyA. When exposed to hourly pulses of far-red light, etiolated seedlings of the wild type or of the fhy3-1 mutant showed similar inhibition of hypocotyl growth, unfolding of the cotyledons, anthocyanin synthesis, and greening upon transfer to white light. In the wild type, continuous far-red light was significantly more effective than hourly far-red pulses (at equal total fluence). In the fhy3-1 mutant, hourly pulses were as effective as continuous far-red light, i.e. the failure of reciprocity typical of HIR was not observed. Germination was similarly promoted by continuous or pulsed far-red in wild-type and fhy3-1 seeds. Thus, for hypocotyl growth, cotyledon unfolding, greening, and seed germination, the fhy3-1 mutant retains VLFR but is severely impaired in HIR. These data are consistent with the idea that VLFR and HIR involve divergent signaling pathways of phyA.

1 This work was supported by Fondo Nacional de Ciencia y Tecnica (PICT 08-00115-02089), University of Buenos Aires (TG 59), Consejo Nacional de Investigaciones Científicas y Técnicas (PIP 0888/98), and Fundación Antorchas (A-13622/1-40).

2 Present address: Department of Cell Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92307.

* Corresponding author; e-mail casal{at}ifeva.edu.ar; fax 5411-45148730.

© 2000 American Society of Plant Physiologists


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