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Plant Physiol, July 2000, Vol. 123, pp. 997-1004
Involvement of Brassinosteroids in the Gravitropic Response of
Primary Root of Maize1
Seong-Ki
Kim,2
Soo Chul
Chang,2
Eun Joo
Lee,
Woo-Sook
Chung,
Young-Soo
Kim,
Seongbin
Hwang, and
June Seung
Lee*
Department of Life Science, Chung-Ang University, Seoul 156-756,
Korea (S.-K.K., W.-S.C., Y.-S.K.); Department of Biological Science,
Ewha Woman's University, Seoul 120-750, Korea (S.C.C., E.J.L.,
J.S.L.); and Department of Molecular Biology, Sejong University, Seoul
143-747, Korea (S.H.)
Exogenously applied brassinolide (BL,
10 9-105 M) increased
gravitropic curvature in maize (Zea mays) primary roots.
The BL-enhanced gravitropic curvature was clearly promoted in the
presence of indole-3-acetic acid (IAA,
1010-108 M), indicating that
BL is interactive with IAA during the gravitropic response. The
interactive effect between BL and IAA was completely diminished by
treatment of p-chlorophenoxy isobutric acid, an auxin
action antagonist. The activation of the gravitropic response by BL in
the absence and in the presence of IAA was nullified by application of
2,3,5-triiodobenzoic acid, a polar auxin transport inhibitor. The data
indicate that brassinosteroids (BRs) might be involved in
auxin-mediated processes for the gravitropic response. Gas
chromotography-selected ion-monitoring analysis revealed that maize
primary roots contained approximately 0.3 ng g1 fresh
weight castasterone as an endogenous BR. Exogenously applied castasterone also increased the gravitropic response of maize roots in
an IAA-dependent manner. This study provides the first evidence, to our
knowledge, for occurrence and gravitropic activity of BRs in plant roots.
1
This research was supported by Korean Ministry
of Education (grant no. BSRI-97-4422 to J.S.L.) and the
interdisciplinary research program of the Korea Science and Engineering
Foundation (grant no. 1999-1-203-002-3 to S.-K.K.).
2
These authors contributed equally to the paper.
*
Corresponding author; e-mail jslee{at}mm.ewha.ac.kr; fax
82-2-3277-2385.
© 2000 American Society of Plant Physiologists
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