Abscisic acid antagonizes ethylene-induced hyponastic growth in Arabidopsis
Abscisic acid antagonizes ethylene-induced hyponastic growth in Arabidopsis
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DOI：
10.1104/pp.106.092700
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发表时间：
2007-02-01
期刊：
影响因子：
7.4
通讯作者：
Peeters, Anton J. M.
中科院分区：
文献类型：
--
作者：
Benschop, Joris J.;Millenaar, Frank F.;Peeters, Anton J. M.
乙烯诱导增强的拟南芥（Arabidopsis thaliana）叶柄的差异生长，导致叶片向上运动（低分化生长）。这种效应的幅度在不同的品种之间存在差异，哥伦比亚-0（Col-0）表现出较大的响应，而在兰茨贝格直立（Ler）中，低速生长是最小的。脱落酸（阿坝）被认为是作为这种反应的抑制因子，在这两个加入，但乙烯和阿坝之间的关系不同的两个阿坝抑制乙烯诱导的低败能力的能力是显着更明显的Col-0。ABI 1或ABI 3的突变诱导了一个强大的乙烯调节hyponastic增长在较低的响应加入Ler，而响应被取消在ABA超敏感的era 1在Col-0。在阿坝水平的修改改变叶柄角度的情况下，施加乙烯，表明阿坝影响叶柄角度也独立于乙烯。提出了一个模型，其中阿坝的负效应对hyponastic增长是克服乙烯在Col-0，但不是在Ler。然而，当阿坝信号被人为地释放在Ler中时，这种调节机制被绕过，导致在该加入中的强烈的低血糖反应。
Ethylene induces enhanced differential growth in petioles of Arabidopsis (Arabidopsis thaliana), resulting in an upward movement of the leaf blades (hyponastic growth). The amplitude of this effect differs between accessions, with Columbia-0 (Col-0) showing a large response, while in Landsberg erecta (Ler), hyponastic growth is minimal. Abscisic acid (ABA) was found to act as an inhibitory factor of this response in both accessions, but the relationship between ethylene and ABA differed between the two; the ability of ABA to inhibit ethylene-induced hyponasty was significantly more pronounced in Col-0. Mutations in ABI1 or ABI3 induced a strong ethylene-regulated hyponastic growth in the less responsive accession Ler, while the response was abolished in the ABA-hypersensitive era1 in Col-0. Modifications in ABA levels altered petiole angles in the absence of applied ethylene, indicating that ABA influences petiole angles also independently from ethylene. A model is proposed whereby the negative effect of ABA on hyponastic growth is overcome by ethylene in Col-0 but not in Ler. However, when ABA signaling is artificially released in Ler, this regulatory mechanism is bypassed, resulting in a strong hyponastic response in this accession.