Long-distance signalling from roots to shoots assessed: the flooding story
Long-distance signalling from roots to shoots assessed: the flooding story
复制标题
DOI：
10.1093/jexbot/53.367.175
复制
发表时间：
2002-02-01
影响因子：
6.9
通讯作者：
Jackson, MB
中科院分区：
文献类型：
--
作者：
Jackson, MB
当根暴露于环境胁迫时，可能会产生多种信号。一些（但不是全部）通过蒸腾流传送到芽。总结的原理可能有助于通过实验确定蒸腾作用传输的根信号的存在或强度。在许多旱地物种中，土壤淹没会引起枝条的发育反应，例如上位叶曲率、气孔关闭和叶子扩张减慢。这些反应补偿了来自根源的资源输入的减少。它们在仅仅几个小时的时间滞后后就开始，持续几天并且具有高度的可重复性，从而有助于研究从根到芽的信号传导。回顾了化学和水力信号促进水淹植物气孔关闭和上位曲率的证据。进一步的进展将取决于检查更广泛的假定信号，解释它们之间的任何相互作用，并改进评估信号在传输中的耐久性和目标地点的有效性的方法。
Several kinds of signal may be generated when roots are exposed to an environmental stress. Some, but not all, are conveyed to shoots in the transpiration stream. Principles are summarized that may help establish experimentally the presence or intensity of root signals transported by transpiration. In many dryland species, flooding of the soil induces developmental responses in the shoot such as epinastic leaf curvature, stomatal closure and slowing of leaf expansion. These reactions compensate for diminished input of resources from the roots. They lend themselves to the study of root-to-shoot signalling by commencing after a time lag of only a few hours, by persisting for several days and by being highly reproducible. Evidence implicating chemical and hydraulic signals in promoting stomatal closure and epinastic curvature in flooded plants is reviewed. Further progress will depend upon examining a wider range of putative signals, accounting for any interactions between them and improving methods for the evaluation of signal durability in transit, and effectiveness at target sites.