ACCUMULATORS AND EXCLUDERS - STRATEGIES IN THE RESPONSE OF PLANTS TO HEAVY-METALS
ACCUMULATORS AND EXCLUDERS - STRATEGIES IN THE RESPONSE OF PLANTS TO HEAVY-METALS
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DOI：
10.1080/01904168109362867
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发表时间：
1981-01-01
影响因子：
2.1
通讯作者：
BAKER, AJM
中科院分区：
文献类型：
--
作者：
BAKER, AJM
定植于含金属土壤的植物已经进化出了能够耐受金属毒性的生理机制。这些机制通常不会抑制金属吸收，但会导致内部解毒。建议植物反应的两种基本策略：累加器和排除器。在前者中，金属可以从低或高背景水平集中在植物部分中。相比之下，排除器中根部和枝条之间的不同吸收和运输导致在宽范围的外部浓度下或多或少恒定的低枝条水平。 “指标”被视为另一种响应模式，其中土壤中的金属含量、植物部分的吸收和积累之间存在比例关系。蓄积剂和排除剂物种的生理特性被认为与金属耐受机制有关。
Plants colonizing metalliferous soils have evolved physiological mechanisms which enable them to tolerate metal toxicity. These mechanisms do not generally suppress metal uptake but result in internal detoxification. Two basic strategies of plant response are suggested, accumulators and excluders. In the former, metals can be concentrated in plant parts from low or high background levels. By contrast, differential uptake and transport between root and shoot in excluders, lead to more or less constant low shoot levels over a wide range of external concentration. ‘Indicators’ are seen as a further mode of response where proportional relationships exist between metal levels in the soil, uptake and accumulation in plant parts. The physiological properties of accumulator and excluder species are considered in relation to metal tolerance mechanisms.