Pb hyperaccumulation and tolerance in common buckwheat (Fagopyrum esculentum Moench) |
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| Authors: | Hideo Tamura Munechika Honda Takeshi Sato Hiroyuki Kamachi |
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| Institution: | (1) Biotechnology Group, Energy Application R&D Center, Chubu Electric Power Co., 20-1 Kitasekiyama, Ohdaka-cho, Midori-ku, Nagoya 459-8522, Japan;(2) Gifu Prefectural Institute for Bio-Industrial Technology, 3481-2 Kamihachiya, Hachiya-cho, Minokamo, Gifu 505-0004, Japan;(3) Department of Civil Engineering, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan;(4) Department of Environmental Biology and Chemistry, Faculty of Science, Toyama University, 3190 Gofuku, Toyama 930-8555, Japan |
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| Abstract: | Common buckwheat grown in Pb-contaminated soil was found to accumulate a large amount of Pb in its leaves (8,000 mg/kg DW),
stem (2,000 mg/kg DW), and roots (3,300 mg/kg DW), without significant damage. This indicates that buckwheat is a newly recognized
Pb hyperaccumulator, which is defined as a plant containing over 1,000 mg/kg of Pb in its shoots on a dry-weight basis. Moreover,
it was shown that application of the biodegradable chelator methylglycinediacetic acid trisodium salt at concentrations of
up to 20 mmol/kg resulted in a more than five times higher concentration of Pb in the shoot without notable growth inhibitation
at up to 10 mmol/kg. These results indicate that buckwheat is a potential phytoremediator of Pb-contaminated soils. |
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| Keywords: | Buckwheat (Fagopyrum esculentum) Hyperaccumulator Lead Metal Phytoremediation |
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