Cell wall integrity controls root elongation via a general 1-aminocyclopropane-1-carboxylic acid-dependent, ethylene-independent pathway.
Cell wall integrity controls root elongation via a general 1-aminocyclopropane-1-carboxylic acid-dependent, ethylene-independent pathway.
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细胞壁完整性通过一般的 1-氨基环丙烷-1-羧酸依赖、不依赖乙烯的途径控制根伸长。
DOI：
10.1104/pp.111.175372
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发表时间：
2011
期刊：
影响因子：
7.4
通讯作者：
Tsang DL
中科院分区：
文献类型：
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作者：
Tsang DL
植物细胞的扩张需要细胞壁的生物合成和重排。在快速伸长期间，例如在黄化的下胚轴和初级根尖的生长期间，细胞对这两个过程中的任何一个的扰动都有很大的反应。越来越多的证据表明，这种反应是由细胞壁完整性感知机制和专门的信号通路启动的，而不是结构完整性丧失的必然结果。然而，这种途径在根组织中的存在及其在更广泛的发育背景下的功能在很大程度上仍不清楚。在这里，我们表明，各种类型的细胞壁胁迫迅速减少了拟南芥(Arabiopsis Thaliana)的初生根伸长。这种反应依赖于1-氨基环丙烷-1-羧酸(ACC)的生物合成。与在根中已建立的乙烯信号通路一致，生长素信号和超氧化物的产生是ACC下游减少伸长所必需的。然而，这种细胞壁应激反应出人意料地并不依赖于对乙烯的感知。我们发现ACC对根的短期影响部分地不依赖于它向乙烯或乙烯信号的转化，并且这种ACC依赖的途径也是响应病原菌相关的分子模式而导致根伸长迅速减少的原因。因此，这种对内外应激的敏锐反应代表了ACC的一种新的、非典型的信号功能。
Cell expansion in plants requires cell wall biosynthesis and rearrangement. During periods of rapid elongation, such as during the growth of etiolated hypocotyls and primary root tips, cells respond dramatically to perturbation of either of these processes. There is growing evidence that this response is initiated by a cell wall integrity-sensing mechanism and dedicated signaling pathway rather than being an inevitable consequence of lost structural integrity. However, the existence of such a pathway in root tissue and its function in a broader developmental context have remained largely unknown. Here, we show that various types of cell wall stress rapidly reduce primary root elongation in Arabidopsis (Arabidopsis thaliana). This response depended on the biosynthesis of 1-aminocyclopropane-1-carboxylic acid (ACC). In agreement with the established ethylene signaling pathway in roots, auxin signaling and superoxide production are required downstream of ACC to reduce elongation. However, this cell wall stress response unexpectedly does not depend on the perception of ethylene. We show that the short-term effect of ACC on roots is partially independent of its conversion to ethylene or ethylene signaling and that this ACC-dependent pathway is also responsible for the rapid reduction of root elongation in response to pathogen-associated molecular patterns. This acute response to internal and external stress thus represents a novel, noncanonical signaling function of ACC.