metal hyperaccumulation threshold
noun phrasePronunciation: /ˈmetəl ˌhaɪpərækjuːmjəˈleɪʃən ˈθreʃoʊld/
The critical concentration level at which a plant accumulates toxic heavy metals (e.g., cadmium, zinc, arsenic) in above-ground tissues without exhibiting phytotoxicity symptoms. This threshold varies species-specifically and determines hyperaccumulator classification.
Plain English
The maximum amount of toxic metal a plant can store in its leaves without being poisoned.
Etymology & History
Usage
"This Thlaspi caerulescens population exceeded the metal hyperaccumulation threshold for cadmium at 100 mg/kg dry weight."
Style guide notes: Always report metal concentration in dry weight percentage or mg/kg with species and tissue type.
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Contrasted with
Related Terms
Frequently Asked Questions
What defines a metal hyperaccumulator plant?
Plants exceeding 100 mg/kg cadmium or zinc in shoots are classified as hyperaccumulators.
How do hyperaccumulators avoid metal toxicity?
Through chelation, compartmentalization, and enhanced antioxidant defenses that mitigate metal-induced damage.
Why Test Candidates on This?
Relevant for understanding hyperaccumulator mechanisms and developing phytoremediation strategies for contaminated sites.
Required skill level: Senior