Walters Dale
Crop and Soil Research Group, Scottish Agricultural College, Ayr Campus, Auchincruive Estate, Ayr KA6 5HW, UK.
New Phytol. 2003 Jul;159(1):109-115. doi: 10.1046/j.1469-8137.2003.00802.x.
Although most work on polyamines in incompatible interactions between plants and pathogens has focussed on polyamines conjugated to phenolic compounds (hydroxycinnamic acid amides), changes in free polyamines and their catabolism have been shown to occur in such interactions. A common feature of these interactions is an increase in diamine oxidase (DAO) activity and, in some interactions, of polyamine oxidase (PAO). The activities of these two enzymes produces hydrogen peroxide (H O ), which may act in structural defense, as a signal molecule, or as an antimicrobial compound in host resistance. There are several possible roles for polyamines and polyamine catabolism in plant resistance to pathogen infection; H O produced might trigger the hypersensitive response (HR), thought to be a form of programmed cell death (PCD), the polyamine spermine might act as an inducer of PR proteins, and as a trigger for caspase activity and hence HR. There is, however, a need for more precise information on the timing and location of changes in polyamine metabolism in the development of resistance. Only with this information can a case be made for the involvement of polyamines and polyamine catabolism in plant defense.
尽管植物与病原体不相容相互作用中关于多胺的大多数研究都集中在与酚类化合物（羟基肉桂酸酰胺）结合的多胺上，但已表明在这种相互作用中游离多胺及其分解代谢会发生变化。这些相互作用的一个共同特征是二胺氧化酶（DAO）活性增加，在某些相互作用中，多胺氧化酶（PAO）活性也增加。这两种酶的活性会产生过氧化氢（H₂O₂），它可能在结构防御中起作用，作为信号分子，或作为宿主抗性中的抗菌化合物。多胺和多胺分解代谢在植物对病原体感染的抗性中可能有多种作用；产生的H₂O₂可能触发超敏反应（HR），超敏反应被认为是程序性细胞死亡（PCD）的一种形式，多胺精胺可能作为病程相关蛋白（PR）的诱导剂，并作为半胱天冬酶活性的触发因素，从而引发HR。然而，在抗性发展过程中，需要更精确的关于多胺代谢变化的时间和位置的信息。只有有了这些信息，才能证明多胺和多胺分解代谢参与植物防御。
