Crossref journal-article
Oxford University Press (OUP)
Plant Physiology (286)
Abstract

Abstract 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 thefhy3-1 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 andfhy3-1 seeds. Thus, for hypocotyl growth, cotyledon unfolding, greening, and seed germination, the fhy3-1mutant 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.

Bibliography

Yanovsky, M. J., Whitelam, G. C., & Casal, J. J. (2000). fhy3-1 Retains Inductive Responses of Phytochrome A. Plant Physiology, 123(1), 235–242.

Authors 3
  1. Marcelo J. Yanovsky (first)
  2. Garry C. Whitelam (additional)
  3. Jorge J. Casal (additional)
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Dates
Type When
Created 23 years, 1 month ago (July 27, 2002, 1:01 a.m.)
Deposited 4 years, 2 months ago (June 25, 2021, 6:50 a.m.)
Indexed 4 weeks, 1 day ago (Aug. 7, 2025, 4:52 a.m.)
Issued 25 years, 4 months ago (May 1, 2000)
Published 25 years, 4 months ago (May 1, 2000)
Published Online 25 years, 4 months ago (May 1, 2000)
Published Print 25 years, 4 months ago (May 1, 2000)
Funders 0

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@article{Yanovsky_2000, title={fhy3-1 Retains Inductive Responses of Phytochrome A}, volume={123}, ISSN={0032-0889}, url={http://dx.doi.org/10.1104/pp.123.1.235}, DOI={10.1104/pp.123.1.235}, number={1}, journal={Plant Physiology}, publisher={Oxford University Press (OUP)}, author={Yanovsky, Marcelo J. and Whitelam, Garry C. and Casal, Jorge J.}, year={2000}, month=may, pages={235–242} }