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Plant Physiol, July 2001, Vol. 126, pp. 1055-1060
Role of Auxin-Induced Reactive Oxygen Species in Root
Gravitropism1
Jung Hee
Joo,
Yun Soo
Bae, and
June Seung
Lee*
Center for Cell Signaling Research, Department of Biological
Sciences, Ewha Womans University, Seoul 120-750, South Korea
We report our studies on root gravitropism indicating that reactive
oxygen species (ROS) may function as a downstream component in
auxin-mediated signal transduction. A transient increase in the
intracellular concentration of ROS in the convex endodermis resulted
from either gravistimulation or unilateral application of auxin to
vertical roots. Root bending was also brought about by unilateral
application of ROS to vertical roots pretreated with the auxin
transport inhibitor N-1-naphthylphthalamic acid. Furthermore, the scavenging of ROS by antioxidants
(N-acetylcysteine, ascorbic acid, and Trolox) inhibited
root gravitropism. These results indicate that the generation of ROS
plays a role in root gravitropism.
1
This work was supported by the Center of
Excellence grant (to J.S.L. and Y.S.B.), by the BK21 program (to
Y.S.B.) from Ministry of Education, and by the Korea Research
Foundation (grant to J.S.L.) made in the program year of 1998.
*
Corresponding author; e-mail jslee{at}mm.ewha.ac.kr; fax
82-2-3277-3760.
© 2001 American Society of Plant Physiologists
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