Heil Martin, Ton Jurriaan
Dpto. de Ingeniería Genética, CINVESTAV--Irapuato, Km. 9.6 Libramiento Norte, CP 36821, Irapuato, Guanajuato, México.
Trends Plant Sci. 2008 Jun;13(6):264-72. doi: 10.1016/j.tplants.2008.03.005. Epub 2008 May 17.
Plants use inducible defence mechanisms to fend off harmful organisms. Resistance that is induced in response to local attack is often expressed systemically, that is, in organs that are not yet damaged. In the search for translocated defence signals, biochemical studies follow the physical movement of putative signals, and grafting experiments use mutants that are impaired in the production or perception of these signals. Long-distance signals can directly activate defence or can prime for the stronger and faster induction of defence. Historically, research has focused on the vascular transport of signalling metabolites, but volatiles can play a crucial role as well. We compare the advantages and constraints of vascular and airborne signals for the plant, and discuss how they can act in synergy to achieve optimised resistance in distal plant parts.
植物利用诱导防御机制抵御有害生物。响应局部攻击而诱导产生的抗性通常会系统性地表达，即在尚未受损的器官中表达。在寻找转运防御信号的过程中，生化研究追踪假定信号的物理移动，嫁接实验则使用在这些信号产生或感知方面受损的突变体。长距离信号可以直接激活防御，也可以引发更强、更快的防御诱导。从历史上看，研究主要集中在信号代谢物的维管运输上，但挥发性物质也可能发挥关键作用。我们比较了维管信号和空气传播信号对植物的优势和限制，并讨论了它们如何协同作用以在植物远端部分实现优化的抗性。
