Journal of Experimental Botany, Vol 49, 127-138, Copyright © 1998 by Oxford University Press
J Casal, R Sanchez and J Botto
Phytochrome is a family of photoreceptors whose apoproteins are encoded by
divergent genes. Three modes of action of phytocrhromes, very-low-fluence
responses (VLFR), low-fluence responses (LFR) and high-irradiance responses
(HIR), have been considered in the literature to define the quantitative
relationship between response and predicted levels of the far-red light
absorbing form of phytochrome. The results of recent experiments with
phytochrome mutant and transgenic seedlings are consistent with the notion
that phytochrome B, and in some cases other stable phytochromes, mediate
LFR whereas phytochrome A mediates both VLFR and HIR. The mechanisms
involved in phytochrome A inductive responses (VLFR) versus HIR appear to
be different in some ways. However, VLFR, LFR and HIR can converge to
control the transcriptional activity of a single gene promoter. The
implications of these findings for the understanding of phytochrome
phototransduction are discussed.Key words: Arabidopsis
thaliana, high-irradiance responses, low-fluence responses,
phytochrome, very-low-fluence responses.
ARTICLES
Review article. Modes of action of phytochromes
FEVA, Departamento de Ecologia, Facultad de Agronomia, Universidad de Buenos Aires, Av. San Martin 4453, 1417-Buenos Aires, Argentina; Corresponding author e-mail: jjcasal@criba.edu.ar
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