Ecological aspects of plant selenium hyperaccumulation : effects of selenium hyperaccumulation on plant-plant interactions
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Hyperaccumulators are plants that accumulate toxic elements to extraordinary levels. Selenium (Se) hyperaccumulators such as Astragalus bisulcatus and Stanleya pinnata can contain 0.1-1.5% of their dry weight in Se (1,000 - 15,000 mg Se kg-1 DW), levels toxic to most other organisms. Selenium promotes hyperaccumulator growth and also offers the plant several ecological advantages through negative effects on Se-sensitive partners. Previous work has shown that high tissue Se levels reduce herbivory and pathogen infection. On the other hand, hyperaccumulators may offer an exclusive niche for ...