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首页> 美国卫生研究院文献>Plant Physiology >An Ethylene-Mediated Increase in Sensitivity to Auxin Induces Adventitious Root Formation in Flooded Rumex palustris Sm.
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An Ethylene-Mediated Increase in Sensitivity to Auxin Induces Adventitious Root Formation in Flooded Rumex palustris Sm.

机译：乙烯介导的对生长素的敏感性增加导致淹没的酸模（Rumex palustris Sm）的不定根形成。

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The hormonal regulation of adventitious root formation induced by flooding of the root system was investigated in the wetland species Rumex palustris Sm. Adventitious root development at the base of the shoot is an important adaptation to flooded conditions and takes place soon after the onset of flooding. Decreases in either endogenous auxin or ethylene concentrations induced by application of inhibitors of either auxin transport or ethylene biosynthesis reduced the number of adventitious roots formed by flooded plants, suggesting an involvement of these hormones in the rooting process. The rooting response during flooding was preceded by increased endogenous ethylene concentrations in the root system. The endogenous auxin concentration did not change during flooding-induced rooting, but a continuous basipetal transport of auxin from the shoot to the rooting zone appeared to be essential in maintaining stable auxin concentrations. These results suggest that the higher ethylene concentration in soil-flooded plants increases the sensitivity of the root-forming tissues to endogenous indoleacetic acid, thus initiating the formation of adventitious roots.
机译：在湿地物种Rumex palustris Sm中研究了由根系系统淹没引起的不定根形成的激素调控。芽根的不定根发育是对淹水条件的重要适应，并在洪水开始后不久发生。通过应用生长素运输或乙烯生物合成抑制剂诱导的内源性生长素或乙烯浓度降低，减少了淹没植物形成的不定根的数量，表明这些激素参与了生根过程。淹水过程中的生根响应之前是根系中内源性乙烯浓度增加。内源的生长素浓度在淹水诱导的生根过程中没有变化，但是从茎到生根区域的连续基床植物生长素的运输看来对于维持稳定的生长素浓度至关重要。这些结果表明，在水淹植物中较高的乙烯浓度增加了成根组织对内源吲哚乙酸的敏感性，从而启动了不定根的形成。

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