Department of Biology, University of Crete, 71409 Heraklion, Greece.
J Exp Bot. 2012 Sep;63(14):5003-15. doi: 10.1093/jxb/ers202.
Polyamines (PAs) are nitrogenous molecules which play a well-established role in most cellular processes during growth and development under physiological or biotic/abiotic stress conditions. The molecular mode(s) of PA action have only recently started to be unveiled, and comprehensive models for their molecular interactions have been proposed. Their multiple roles are exerted, at least partially, through signalling by hydrogen peroxide (H(2)O(2)), which is generated by the oxidation/back-conversion of PAs by copper amine oxidases and PA oxidases. Accumulating evidence suggests that in plants the cellular titres of PAs are affected by other nitrogenous compounds. Here, we discuss the state of the art on the possible nitrogen flow in PAs, their interconnection with nitrogen metabolism, as well as the signalling roles of PA-derived H(2)O(2) during some developmental processes and stress responses.
多胺（PAs）是含氮分子，在生长和发育过程中，在生理或生物/非生物胁迫条件下，它们在大多数细胞过程中发挥着既定的作用。PA 作用的分子模式最近才开始被揭示，并且已经提出了它们分子相互作用的综合模型。它们的多种作用至少部分是通过过氧化氢（H（2）O（2））的信号传导来发挥的，H（2）O（2）是由铜胺氧化酶和 PA 氧化酶氧化/反转化 PA 产生的。越来越多的证据表明，在植物中，PAs 的细胞含量受其他含氮化合物的影响。在这里，我们讨论了 PAs 中可能的氮流、它们与氮代谢的相互连接以及 PA 衍生的 H（2）O（2）在一些发育过程和应激反应中的信号作用的最新进展。
