Dynamics of long-distance signaling via plant vascular tissues.
Dynamics of long-distance signaling via plant vascular tissues.
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DOI：
10.3389/fpls.2015.00161
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发表时间：
2015
影响因子：
5.6
通讯作者：
Okamoto S
中科院分区：
文献类型：
--
作者：
Notaguchi M;Okamoto S
植物维管系统是由特定的细胞壁修饰而形成的，细胞通过这种修饰高度特化，成为输送水分和营养物质的管道。木质部导管是由细胞程序性死亡后残存的增厚细胞壁形成的，作为从根到茎的水管道。相反，韧皮部组织是由活细胞组成的复合体，包括筛管细胞及其邻近的伴侣细胞，并将光合同化物从成熟叶片转运到发育中的年轻组织。对植物维管流液含量的深入研究揭示了植物维管流组织运输多种类型的基因产物，其中一些基因的运输为植物的长距离通讯提供了分子基础。对木质部汁液的分析表明木质部蒸腾流中存在蛋白质。最近的研究表明，在植物-微生物相互作用和土壤氮饥饿的作用下，根系分泌的CLE和CEP肽分别通过木质部转运到地面上。它们位于茎部韧皮部的富含亮氨酸的重复跨膜受体是将信号从茎部传递到根所必需的。这些发现很好地符合当前的根到茎到根反馈信号的情况，其中肽运输实现了根到茎的信号传导，这是信号传导过程的前半部分。同时，现在有充分的证据表明，蛋白质和一系列rna是通过韧皮部转运系统运输的，其中一些可以在目的地发挥其生理功能，包括根。因此，植物维管系统不仅可以作为必需物质转运的管道，还可以作为植物在整个植物水平上适应内外环境变化的长距离通信途径。
Plant vascular systems are constructed by specific cell wall modifications through which cells are highly specialized to make conduits for water and nutrients. Xylem vessels are formed by thickened cell walls that remain after programmed cell death, and serve as water conduits from the root to the shoot. In contrast, phloem tissues consist of a complex of living cells, including sieve tube elements and their neighboring companion cells, and translocate photosynthetic assimilates from mature leaves to developing young tissues. Intensive studies on the content of vascular flow fluids have unveiled that plant vascular tissues transport various types of gene product, and the transport of some provides the molecular basis for the long-distance communications. Analysis of xylem sap has demonstrated the presence of proteins in the xylem transpiration stream. Recent studies have revealed that CLE and CEP peptides secreted in the roots are transported to above ground via the xylem in response to plant–microbe interaction and soil nitrogen starvation, respectively. Their leucine-rich repeat transmembrane receptors localized in the shoot phloem are required for relaying the signal from the shoot to the root. These findings well-fit to the current scenario of root-to-shoot-to-root feedback signaling, where peptide transport achieves the root-to-shoot signaling, the first half of the signaling process. Meanwhile, it is now well-evidenced that proteins and a range of RNAs are transported via the phloem translocation system, and some of those can exert their physiological functions at their destinations, including roots. Thus, plant vascular systems may serve not only as conduits for the translocation of essential substances but also as long-distance communication pathways that allow plants to adapt to changes in internal and external environments at the whole plant level.
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影响因子：
7.3
作者：
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通讯作者：
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影响因子：
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作者：
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影响因子：
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作者：
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1073/pnas.94.25.14150
发表时间：
1997-12-09
影响因子：
11.1
作者：
Balachandran, S;Xiang, Y;Lucas, WJ
通讯作者：
Lucas, WJ