Heavy metal stress can prime for herbivore-induced plant volatile emission.
Heavy metal stress can prime for herbivore-induced plant volatile emission.
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DOI：
10.1111/j.1365-3040.2012.02489.x
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发表时间：
2012-07
期刊：
影响因子：
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通讯作者：
T. Winter;L. Borkowski;J. Zeier;M. Rostás
中科院分区：
文献类型：
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作者：
T. Winter;L. Borkowski;J. Zeier;M. Rostás
重金属是严重影响生态食物网的重要污染物。除了直接的毒性作用外，这些污染物还被认为会破坏植物和昆虫之间依赖挥发性有机化合物（VOC）的化学通讯渠道。我们研究了不同浓度的铜（Cu）和镉（Cd）胁迫如何影响玉米在存在和不存在植食性昆虫的情况下合成VOCs的能力。水培玉米暴露于高浓度和低浓度的铜或镉表现出发育不良的生长和较低的光合能力。食草动物喂养的压力植物也有衰减的增长率。重金属单独处理并没有诱导挥发性有机化合物的排放在玉米植株，但是，较高的铜剂量被认为是总理增强挥发性物质的生产，可以引发毛虫喂养。铜胁迫与根中活性氧水平的增加和叶片中茉莉酸的引发有关。植物与镉和草食动物的挑战没有不同的反应相比，草食动物破坏的控制，没有重金属添加到基板。对于铜胁迫，我们的研究结果支持“单一的生化机制，多个压力”模型，预测重叠的信号和响应非生物和生物胁迫因素。
Heavy metals are important pollutants that can severely impact ecological foodwebs. In addition to direct toxic effects, these contaminants have been suggested to disrupt chemical communication channels between plants and insects that rely on volatile organic compounds (VOCs). We investigated how different concentrations of copper (Cu) and cadmium (Cd) stress affect the capacity of Zea mays to synthesize VOCs in the presence and absence of herbivorous insects. Hydroponically grown maize exposed to a high and low concentration of either Cu or Cd showed stunted growth and lower photosynthetic capacities. Herbivores feeding on stressed plants also had attenuated growth rates. Heavy metal treatment alone did not induce VOC emission in maize plants; however, the higher Cu dose was found to prime for enhanced volatile production that can be triggered by caterpillar feeding. Cu stress correlated with increased levels of reactive oxygen species in roots and priming of herbivore-induced jasmonic acid in leaves. Plants challenged with Cd and herbivory did not differ in responses compared with herbivore-damaged controls with no heavy metals added to the substrate. For Cu stress, our results support the 'single biochemical mechanism for multiple stressors' model which predicts overlapping signalling and responses to abiotic and biotic stress factors.