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THE PLANT CELL, Vol 7, Issue 4 473-485, Copyright © 1995 by American Society of Plant Biologists
Mutations in the NPH1 Locus of Arabidopsis Disrupt the Perception of Phototropic Stimuli
E. Liscum and W. R. Briggs
Department of Plant Biology, Carnegie Institution of Washington, 290 Panama Street, Stanford, California 94305-1297
The phototropic response is an important component of seedling
establishment in higher plants because it orients the young seedlings for
maximal photosynthetic light capture. Despite their obvious importance,
little is known about the mechanisms underlying the perception and
transduction of the light signals that induce phototropic curvatures. Here,
we report the isolation of eight mutants of Arabidopsis that lack or have
severely impaired phototropic responses. These nph (for nonphototropic
hypocotyl) mutants comprise four genetic loci: nph1, nph2, nph3, and nph4.
Physiological and biochemical characterization of the nph1 allele series
indicated that the NPH1 locus may encode the apoprotein for a
dualchromophoric or multichromophoric holoprotein photoreceptor capable of
absorbing UV-A, blue, and green light and that this photoreceptor regulates
all the phototropic responses of Arabidopsis. It appears that the NPH1
protein is most likely a 120-kD plasma membrane-associated phosphoprotein
because all of the nph1 mutations negatively affected the abundance of this
protein. In addition, the putative NPH1 photoreceptor protein is
genetically and biochemically distinct from the HY4 protein, which most
likely acts as a photoreceptor for blue light-mediated hypocotyl growth
inhibition. Furthermore, the NPH1 and HY4 proteins are not functionally
redundant because mutations in either gene alone affect only one
physiological response but not the other, thus providing strong support for
the hypothesis that more than one blue light photoreceptor is required for
the normal growth and development of a seedling.
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J. M. Christie, M. Salomon, K. Nozue, M. Wada, and W. R. Briggs
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G. Lascève, J. Leymarie, M. A. Olney, E. Liscum, J. M. Christie, A. Vavasseur, and W. R. Briggs
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December 22, 1998;
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E. L. Stowe-Evans, R. M. Harper, A. V. Motchoulski, and E. Liscum
NPH4, a Conditional Modulator of Auxin-Dependent Differential Growth Responses in Arabidopsis
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December 1, 1998;
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J. M. Christie, P. Reymond, G. K. Powell, P. Bernasconi, A. A. Raibekas, E. Liscum, and W. R. Briggs
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Science,
November 27, 1998;
282(5394):
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[Abstract]
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J. M. Christie and W. R. Briggs
Blue Light Sensing in Higher Plants
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T. Sakai, T. Kagawa, M. Kasahara, T. E. Swartz, J. M. Christie, W. R. Briggs, M. Wada, and K. Okada
Arabidopsis nph1 and npl1: Blue light receptors that mediate both phototropism and chloroplast relocation
PNAS,
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[Abstract]
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M. Salomon, W. Eisenreich, H. Durr, E. Schleicher, E. Knieb, V. Massey, W. Rudiger, F. Muller, A. Bacher, and G. Richter
An optomechanical transducer in the blue light receptor phototropin from Avena sativa
PNAS,
October 23, 2001;
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[Abstract]
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