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The blue light receptor cryptochrome 1 can act independently of phytochrome A and B in Arabidopsis thaliana
Author(s) -
Poppe Christoph,
Sweere Uta,
DrummHerrel Helge,
Schäfer Eberhard
Publication year - 1998
Publication title -
the plant journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.058
H-Index - 269
eISSN - 1365-313X
pISSN - 0960-7412
DOI - 10.1046/j.1365-313x.1998.00322.x
Subject(s) - phytochrome , hypocotyl , cryptochrome , arabidopsis , blue light , arabidopsis thaliana , phytochrome a , photomorphogenesis , mutant , botany , germination , biology , far red , biophysics , darkness , microbiology and biotechnology , chemistry , red light , biochemistry , gene , optics , physics , circadian clock
Summary Blue light responses in higher plants can be mediated not only by specific blue light receptors, but also by the red/far‐red photoreversible phytochrome system. The question of interdependence between these photoreceptors has been debated over many years. The availability ofArabidopsismutants for the blue light receptor CRY1 and for the two major phytochromes phyA and phyB allows a reinvestigation of this question. The analysis of photocontrol of seed germination, inhibition of hypocotyl growth and anthocyanin accumulation clearly demonstrates that (i) phyA shows a strong control in blue light responses especially at low fluence rates; (ii) phyB mediated induction reactions can be reversed by subsequent blue light irradiations; and (iii) CRY1 mediates blue light controlled inhibition of hypocotyl growth only at fluence rates higher than 5 μmol m –2 s –1 and independently of phytochrome A and B.