|
Plant Physiol, June 2001, Vol. 126, pp. 826-834
The Enhancement of Phototropin-Induced Phototropic Curvature
in Arabidopsis Occurs via a Photoreversible Phytochrome A-Dependent
Modulation of Auxin Responsiveness1
Emily L.
Stowe-Evans,
Darron R.
Luesse,2 and
Emmanuel
Liscum*
Division of Biological Sciences, University of Missouri, Columbia,
Missouri 65211
The induction of phototropism in etiolated (dark-grown) seedlings
exposed to an unidirectional pulse or extended irradiation with low
fluence rate blue light (BL) requires the action of the phototropin
(nph1) BL receptor. Although cryptochromes and phytochromes are not
required for phototropic induction, these photoreceptors do modulate
the magnitude of curvature resulting from phototropin activation.
Modulatory increases in the magnitude of phototropic curvature have
been termed "enhancement." Here, we show that phototropic enhancement is primarily a phytochrome A (phyA)-dependent
red/far-red-reversible low fluence response. This phyA-dependent
response is genetically separable from the basal phototropin-dependent
response, as demonstrated by its retention under extended irradiation
conditions in the nph4 mutant background, which normally
lacks the basal BL-induced response. It is interesting that the
nph4 mutants fail to exhibit the basal
phototropin-dependent and phyA-dependent enhancement responses under
limiting light conditions. Given that NPH4 encodes a
transcriptional activator, auxin response factor 7 (ARF7), we hypothesize that the ultimate target(s) of phyA action during the
phototropic enhancement response is a rate-limiting ARF-containing transcriptional complex in which the constituent ARFs can vary in
identity or activity depending upon the irradiation condition.
1
This work was supported by the National Science
Foundation (grant no. MCB-9723124 to E.L.) and by the University of
Missouri Research Board (grant no. RB96-055 to E.L). E.L.S.-E. was
supported by a predoctoral fellowship from the University of Missouri
Maize Biology Training Program, a unit of the U.S. Department of
Energy/National Science Foundation/U.S. Department of Agriculture
Collaborative Research in Plant Biology Program. D.R.L. was supported
by a University of Missouri Undergraduate Arts and Sciences Fellowship.
2
Present address: Department of Biology, Indiana
University, Bloomington, IN 47405.
*
Corresponding author; e-mail liscumm{at}missouri.edu; fax
573-882-2672.
© 2001 American Society of Plant Physiologists
This article has been cited by other articles:
|
|
|
|
 
J. Kneissl, T. Shinomura, M. Furuya, and C. Bolle
A Rice Phytochrome A in Arabidopsis: The Role of the N-terminus under red and far-red light
Mol Plant,
January 1, 2008;
1(1):
84 - 102.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
B. B. Stone, E. L. Stowe-Evans, R. M. Harper, R. B. Celaya, K. Ljung, G. Sandberg, and E. Liscum
Disruptions in AUX1-Dependent Auxin Influx Alter Hypocotyl Phototropism in Arabidopsis
Mol Plant,
January 1, 2008;
1(1):
129 - 144.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
H. E. Boccalandro, S. N. De Simone, A. Bergmann-Honsberger, I. Schepens, C. Fankhauser, and J. J. Casal
PHYTOCHROME KINASE SUBSTRATE1 Regulates Root Phototropism and Gravitropism
Plant Physiology,
January 1, 2008;
146(1):
108 - 115.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
U. V. Pedmale and E. Liscum
Regulation of Phototropic Signaling in Arabidopsis via Phosphorylation State Changes in the Phototropin 1-interacting Protein NPH3
J. Biol. Chem.,
July 6, 2007;
282(27):
19992 - 20001.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
J. Rosler, I. Klein, and M. Zeidler
Arabidopsis fhl/fhy1 double mutant reveals a distinct cytoplasmic action of phytochrome A
PNAS,
June 19, 2007;
104(25):
10737 - 10742.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
T. Kanegae, E. Hayashida, C. Kuramoto, and M. Wada
A single chromoprotein with triple chromophores acts as both a phytochrome and a phototropin
PNAS,
November 21, 2006;
103(47):
17997 - 18001.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
P. Lariguet, I. Schepens, D. Hodgson, U. V. Pedmale, M. Trevisan, C. Kami, M. de Carbonnel, J. M. Alonso, J. R. Ecker, E. Liscum, et al.
PHYTOCHROME KINASE SUBSTRATE 1 is a phototropin 1 binding protein required for phototropism
PNAS,
June 27, 2006;
103(26):
10134 - 10139.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
C. W. Whippo and R. P. Hangarter
Phototropism: Bending towards Enlightenment.
PLANT CELL,
May 1, 2006;
18(5):
1110 - 1119.
[Full Text]
[PDF]
|
|
|
|
|
|
|
M. Takano, N. Inagaki, X. Xie, N. Yuzurihara, F. Hihara, T. Ishizuka, M. Yano, M. Nishimura, A. Miyao, H. Hirochika, et al.
Distinct and Cooperative Functions of Phytochromes A, B, and C in the Control of Deetiolation and Flowering in Rice
PLANT CELL,
December 1, 2005;
17(12):
3311 - 3325.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
C. Sorin, J. D. Bussell, I. Camus, K. Ljung, M. Kowalczyk, G. Geiss, H. McKhann, C. Garcion, H. Vaucheret, G. Sandberg, et al.
Auxin and Light Control of Adventitious Rooting in Arabidopsis Require ARGONAUTE1
PLANT CELL,
May 1, 2005;
17(5):
1343 - 1359.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
A. Srinivas, R. K. Behera, T. Kagawa, M. Wada, and R. Sharma
High Pigment1 Mutation Negatively Regulates Phototropic Signal Transduction in Tomato Seedlings
Plant Physiology,
February 1, 2004;
134(2):
790 - 800.
[Abstract]
[Full Text]
[PDF]
|
|
|
|
|
|
|
T. J. Campbell and E. Liscum
Plant Photobiology 2001: A Thousand Points of Enlightenment from Receptor Structures to Ecological Adaptation
PLANT CELL,
August 1, 2001;
13(8):
1704 - 1710.
[Full Text]
[PDF]
|
|
|
|
|
