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首页> 美国卫生研究院文献>Royal Society Open Science >Variation in defence strategies in the metal hyperaccumulator plant Noccaea caerulescens is indicative of synergies and trade-offs between forms of defence
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Variation in defence strategies in the metal hyperaccumulator plant Noccaea caerulescens is indicative of synergies and trade-offs between forms of defence

机译：金属超蓄积植物夜蛾Noccaea caerulescens防御策略的差异表明防御形式之间的协同作用和权衡

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In the metal hyperaccumulator plant Noccaea caerulescens, zinc may provide a defence against pathogens. However, zinc accumulation is a variable trait in this species. We hypothesize that this variability affects the outcome of interactions between metal accumulation and the various constitutive and inducible defences that N. caerulescens shares with non-accumulator plants. We compare zinc concentrations, glucosinolate concentrations and inducible stress responses, including reactive oxygen species (ROS) and cell death, in four N. caerulescens populations, and relate these to the growth of the plant pathogen Pseudomonas syringae, its zinc tolerance mutants and Pseudomonas pathogens isolated from a natural population of N. caerulescens. The populations display strikingly different combinations of defences. Where defences are successful, pathogens are limited primarily by metals, cell death or organic defences; there is evidence of population-dependent trade-offs or synergies between these. In addition, we find evidence that Pseudomonas pathogens have the capacity to overcome any of these defences, indicating that the arms race continues. These data indicate that defensive enhancement, joint effects and trade-offs between different forms of defence are all plausible explanations for the variation we observe between populations, with factors including metal availability and metal-tolerant pathogen load probably shaping the response of each population to infection.
机译：在金属超富集植物夜光藻中，锌可以提供对病原体的防御作用。然而，锌的积累是该物种的可变性状。我们假设这种变异性会影响金属积累与芥蓝猪笼草与非积累植物共享的各种本构和诱导防御之间相互作用的结果。我们比较了四个菜青虫种群中的锌浓度，芥子油苷浓度和诱导性应激反应，包括活性氧（ROS）和细胞死亡，并将其与植物病原体丁香假单胞菌，其耐锌突变体和假单胞菌病原体的生长相关。分离自青枯猪笼草的自然种群。人口显示出明显不同的防御组合。在防御成功的地方，病原体主要受到金属，细胞死亡或有机防御的限制；有证据表明，这些因素之间存在着人口依赖性的权衡或协同作用。此外，我们发现有证据表明假单胞菌病原体具有克服任何这些防御能力的能力，表明军备竞赛仍在继续。这些数据表明，不同防御方式之间的防御性增强，联合效应和权衡都是我们在种群之间观察到的变异的合理解释，包括金属可用性和耐金属病原体负荷在内的因素可能会影响每个种群对感染的反应。

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