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A Method to Preserve Wetland Roots and Rhizospheres for Elemental Imaging

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Ecological aspects of plant selenium hyperaccumulation.

A F El Mehdawi¹, E A H Pilon-Smits

¹Biology Department, Colorado State University, Fort Collins, CO 80523, USA.

Plant Biology (Stuttgart, Germany)

|December 3, 2011

Summary

Selenium hyperaccumulators concentrate toxic selenium, offering ecological advantages by deterring herbivores and pathogens. These plants influence species composition and selenium cycling in ecosystems.

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Area of Science:

Plant Biology
Ecology
Environmental Science

Background:

Hyperaccumulators are plants that accumulate toxic elements to extraordinary levels.
Selenium (Se) hyperaccumulators can contain 0.1-1.5% of their dry weight as Se, levels toxic to most other organisms.

Purpose of the Study:

To summarize the ecological functions and implications of selenium (hyper)accumulation by plants.
To understand the role of Se hyperaccumulators in plant-microbe-animal interactions and ecosystem processes.

Main Methods:

Literature review of existing studies on selenium hyperaccumulators.
Analysis of ecological advantages and disadvantages conferred by Se accumulation.
Assessment of impacts on herbivores, pathogens, pollinators, microbes, and neighboring plants.

Main Results:

Selenium promotes hyperaccumulator growth and provides ecological advantages by negatively impacting Se-sensitive organisms.
High tissue Se levels reduce herbivory and pathogen infection, and inhibit neighboring plants via litter deposition.
Se hyperaccumulators create niches for Se-tolerant species and can facilitate these partners through Se enrichment.

Conclusions:

Se hyperaccumulators influence local species composition and richness by favoring Se-tolerant species across trophic levels.
These plants play a crucial role in selenium entry and cycling within seleniferous ecosystems.
Ecological insights into Se hyperaccumulation aid in managing seleniferous areas and developing Se-rich crops for phytoremediation or biofortification.