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Plant Cell, Vol. 12, 2061-2074, November 2000, Copyright © 2000, American Society of Plant Physiologists
REP1, a Basic Helix-Loop-Helix Protein, Is Required for a Branch Pathway of Phytochrome A Signaling in Arabidopsis
Moon-Soo Soha,
Young-Mi Kima,
Sang-Jo Hana, and
Pill-Soon Songa,b,c
a Kumho Life and Environmental Science Laboratory, 1, Oryong-Dong, Puk-Gu, Kwangju 500-712, Republic of Korea
b Department of Chemistry, University of Nebraska, Lincoln, Nebraska 68588
c Department of Life Science, Kwangju Institute of Science and Technology, Kwangju 500-712, Republic of Korea
Correspondence to:
Moon-Soo Soh, mssoh{at}ksc.kumho.co.kr (E-mail), 82-62-972-5085 (fax)
Phytochromes are primary photoreceptors mediating diverse responses ranging from induction of germination to floral induction in higher plants. We have isolated novel recessive rep1 (reduced phytochrome signaling 1) mutants, which exhibit a long-hypocotyl phenotype only under far-red light but not under red light. Physiological characterization showed that rep1 mutations greatly reduced a subset of phytochrome A–regulated responses, including the inhibition of hypocotyl elongation, cotyledon expansion, modulation of gravitropic growth of hypocotyl, and induction of the CAB (encoding chlorophyll a/b binding protein) gene, without affecting the accumulation of anthocyanin, far-red-preconditioned blocking of greening, induction of germination, and induction of CHS (encoding chalcone synthase) and FNR (encoding ferredoxin-NADP+ oxidoreductase) genes. These results suggest that REP1 is a positive signaling component, functioning in a branch of the phytochrome A signaling pathway. Molecular cloning and characterization of the REP1 gene revealed that it encodes a light-inducible, putative transcription factor containing the basic helix-loop-helix motif.
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