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首页> 外文期刊>Journal of Experimental Botany >Ethylene-induced Arabidopsis hypocotyl elongation is dependent on but not mediated by gibberellins
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Ethylene-induced Arabidopsis hypocotyl elongation is dependent on but not mediated by gibberellins

机译：乙烯诱导的拟南芥下胚轴伸长取决于但不由赤霉素介导

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摘要

Ethylene, or its precursor 1-aminocyclopropane-1-carboxylic acid (ACC), can stimulate hypocotyl elongation in the light. It is questioned whether gibberellins (GAs) play a role in this response. Tests with light of different wavelengths demonstrated that the ethylene response depends on blue light and functional cryptochrome signalling. Levels of bio-active GA(4) were reduced in seedlings showing an ethylene response. Furthermore, ACC treatment of seedlings caused accumulation of the DELLA protein RGA, a repressor of growth. Concurrently, transcript levels of several GA biosynthesis genes were up-regulated and GA inactivation genes down-regulated by ACC. Hypocotyl elongation in response to ACC was strongly reduced in seedlings with a diminished GA signal, while being vigorously stimulated in a quadruple DELLA knock-out mutant with constitutive GA signalling. These data show that ethylene-driven hypocotyl elongation is mainly blue light-dependent and that this ethylene response, although GA dependent, hence needing a basal GA level, is not mediated by GA, but rather acts via a separate pathway.
机译：乙烯或其前体1-氨基环丙烷-1-羧酸（ACC）可以在光照下刺激下胚轴伸长。有人质疑赤霉素（GAs）是否在这种反应中起作用。用不同波长的光进行的测试表明，乙烯响应取决于蓝光和功能性隐色信号。表现出乙烯反应的幼苗中生物活性GA（4）的水平降低。此外，幼苗的ACC处理导致DELLA蛋白RGA的积累，后者是生长的阻遏物。同时，一些GA生物合成基因的转录水平被ACC上调，GA失活基因被ACC下调。在GA信号减弱的幼苗中，对ACC的下胚轴伸长被大大降低，而在具有组成性GA信号的四倍DELLA敲除突变体中受到强烈刺激。这些数据表明，乙烯驱动的下胚轴伸长率主要是蓝光依赖性的，尽管该GA响应是乙烯的，因此需要基本的GA水平，但该乙烯反应不是由GA介导的，而是通过单独的途径起作用的。

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