Effects of ethylene and abscisic acid upon heterophylly in Ludwigia arcuata (Onagraceae)
Effects of ethylene and abscisic acid upon heterophylly in Ludwigia arcuata (Onagraceae)
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DOI：
10.1007/s00425-003-1062-z
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发表时间：
2003-10-01
期刊：
影响因子：
4.3
通讯作者：
Nagata, T
中科院分区：
文献类型：
--
作者：
Kuwabara, A;Ikegami, K;Nagata, T
本文研究了乙烯和脱落酸（阿坝）对丁香异叶形成的影响。乙烯气体处理导致L。而阿坝处理诱导了沉水枝上陆地型叶片的形成。测定了沉水枝的内源乙烯浓度，结果表明，沉水枝的内源乙烯浓度高于陆地枝。相反，地上部的内源阿坝浓度高于淹水部。为了阐明乙烯和阿坝的相互作用，同时添加这两种植物激素进行了检查。当L.用这两种植物激素处理红毛忍冬植株，阿坝的作用优于乙烯的作用，导致了陆生叶片的形成。这表明阿坝可能位于乙烯信号转导链的下游，形成异叶性变化。此外，乙烯处理还诱导了番茄组织内源阿坝水平的降低。在形成沉水型叶的过程中，因此，乙烯和阿坝对异叶形成的影响进行了讨论乙烯和阿坝信号通路之间的串扰的关系。
In this study, we examined the effects of ethylene and abscisic acid (ABA) upon heterophyllous leaf formation of Ludwigia arcuata Walt. Treatment with ethylene gas resulted in the formation of submerged-type leaves on terrestrial shoots of L. arcuata, while treatments with ABA induced the formation of terrestrial-type leaves on submerged shoots. Measurement of the endogenous ethylene concentration of submerged shoots showed that it was higher than that of terrestrial ones. In contrast, the endogenous ABA concentration of terrestrial shoots was higher than that of submerged ones. To clarify interactions of ethylene and ABA, simultaneous additions of these two plant hormones were examined. When L. arcuata plants were treated with these two plant hormones, the effects of ABA dominated that of ethylene, resulting in the formation of terrestrial-type leaves. This suggests that ABA may be located downstream of ethylene in signal transduction chains for forming heterophyllous changes. Further, ethylene treatment induced the reduction of endogenous levels of ABA in tissues of L. arcuata, resulting in the formation of submerged-type leaves. Thus the effects of ethylene and ABA upon heterophyllous leaf formation are discussed in relationship to the cross-talk between signaling pathways of ethylene and ABA.