Involvement of brassinosteroids in the gravitropic response of primary root of maize

被引:102
作者
Kim, SK
Chang, SC
Lee, EJ
Chung, WS
Kim, YS
Hwang, S
Lee, JS [1 ]
机构
[1] Chung Ang Univ, Dept Life Sci, Seoul 156756, South Korea
[2] Ewha Womans Univ, Dept Sci Biol, Seoul 120750, South Korea
[3] Sejong Univ, Dept Biol Mol, Seoul 143747, South Korea
关键词
D O I
10.1104/pp.123.3.997
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Exogenously applied brassinolide (BL, 10(-9)-10(-5) M) increased gravitropic curvature in maize (Zen mays) primary roots. The BL-enhanced gravitropic curvature was clearly promoted in the presence of indole-3-acetic acid (IAA, 10(-10)-10(-8) 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 g(-1) 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.
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收藏
页码:997 / 1004
页数:8
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