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首页> 外文期刊>Journal of Experimental Botany >Hormonal control of root development on epiphyllous plantlets of Bryophyllum (Kalanchoë) marnierianum: role of auxin and ethylene
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Hormonal control of root development on epiphyllous plantlets of Bryophyllum (Kalanchoë) marnierianum: role of auxin and ethylene

机译：激素对小叶锦鸡儿（Bryophyllum（Kalanchoë）marnierianum）epi生苗根系发育的激素控制：生长素和乙烯的作用

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摘要

Epiphyllous plantlets develop on leaves of Bryophyllum marnierianum when they are excised from the plant. Shortly after leaf excision, plantlet shoots develop from primordia located near the leaf margin. After the shoots have enlarged for several days, roots appear at their base. In this investigation, factors regulating plantlet root development were studied. The auxin transport inhibitor 2,3,5-triiodobenzoic acid (TIBA) abolished root formation without markedly affecting shoot growth. This suggested that auxin transport from the plantlet shoot induces root development. Excision of plantlet apical buds inhibits root development. Application of indole-3-acetic acid (IAA) in lanolin at the site of the apical buds restores root outgrowth. Naphthalene acetic acid (NAA), a synthetic auxin, reverses TIBA inhibition of plantlet root emergence on leaf explants. Both of these observations support the hypothesis that auxin, produced by the plantlet, induces root development. Exogenous ethylene causes precocious root development several days before that of a control without hormone. Ethylene treatment cannot bypass the TIBA block of root formation. Therefore, ethylene does not act downstream of auxin in root induction. However, ethylene amplifies the effects of low concentrations of NAA, which in the absence of ethylene do not induce roots. Ag2S2O3, an ethylene blocker, and CoCl2, an ethylene synthesis inhibitor, do not abolish plantlet root development. It is therefore unlikely that ethylene is essential for root formation. Taken together, the experiments suggest that roots develop when auxin transport from the shoot reaches a certain threshold. Ethylene may augment this effect by lowering the threshold and may come into play when the parent leaf senesces.
机译：当从植物中切除时，生小植株生长在Bryophyllum marnierianum的叶子上。叶片切除后不久，从靠近叶片边缘的原基发育出苗芽。芽扩大几天后，根部出现在根部。在这项调查中，研究了调节幼苗根系发育的因素。生长素运输抑制剂2,3,5-三碘苯甲酸（TIBA）消除了根的形成，而没有明显影响芽的生长。这表明从苗芽中生长素的运输诱导了根的发育。去除小苗顶芽会抑制根的发育。在顶芽部位的羊毛脂中使用吲哚-3-乙酸（IAA）可恢复根部生长。萘乙酸（NAA）是一种合成的生长素，可以逆转TIBA对叶片外植体上小根生长的抑制作用。这两个观察结果都支持这样的假说，即由小苗产生的生长素诱导根发育。外源乙烯导致早熟的根发育，比没有激素的对照早几天。乙烯处理不能绕过TIBA根形成块。因此，乙烯在根诱导中不作用于生长素的下游。但是，乙烯会放大低浓度NAA的作用，在没有乙烯的情况下，NAA不会诱导根系。乙烯阻滞剂Ag 2 S 2 O 3 和乙烯合成抑制剂CoCl 2 取消小苗根的发育。因此，乙烯不太可能对根形成至关重要。两者合计，这些实验表明，当新芽中的生长素转运达到一定阈值时，就会形成根。乙烯可以通过降低阈值来增强这种效果，并且可以在亲本叶片衰老时发挥作用。

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    《Journal of Experimental Botany》 |2008年第9期|p.2361-2370|共10页
  • 作者

    Richard G. Kulka*;

  • 作者单位

    Department of Biological Chemistry, The Alexander Silberman Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem 91904, Israel;

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