Hendry George A F, Brocklebank K Jane
Unit of Comparative Plant Ecology (NERC), Department of Botany, The University, Sheffield S10 2TN, UK.
New Phytol. 1985 Sep;101(1):199-206. doi: 10.1111/j.1469-8137.1985.tb02826.x.
Roots of the iron-sensitive wetland plant, Epilobium hirsutum L., respond to oxygen-depletion by enhanced uptake of ferrous ions. Evidence is presented for an iron-catalyzed reaction within roots leading to super oxide radical formation and the induction of superoxide dismutase. The immediate product, H O , appears to accumulate in the absence of catalase and low activity of root peroxidases, resulting in hydroxyl radical formation, inhibition of protein synthesis, increased lipid peroxidation and gross cellular damage. Evidence for alternative 'healthy' responses is given. A scheme is presented which outlines a biochemical mechanism for iron-mediated flood or waterlogging tolerance and intolerance in plants.
对铁敏感的湿地植物柳叶菜（Epilobium hirsutum L.）的根系通过增强亚铁离子的吸收来应对缺氧情况。文中提供了证据表明根系内存在铁催化反应，该反应会导致超氧自由基的形成以及超氧化物歧化酶的诱导。在缺乏过氧化氢酶和根系过氧化物酶活性较低的情况下，直接产物H₂O₂似乎会积累，从而导致羟基自由基的形成、蛋白质合成的抑制、脂质过氧化的增加以及细胞的严重损伤。文中还给出了替代性“健康”反应的证据。提出了一个方案，概述了植物中铁介导的耐涝或不耐涝的生化机制。
