Pb hyperaccumulation and tolerance in common buckwheat (Fagopyrum esculentum Moench)

Journal of Plant Research - Tập 118 - Trang 355-359 - 2005
Hideo Tamura1, Munechika Honda2, Takeshi Sato3, Hiroyuki Kamachi4
1Biotechnology Group, Energy Application R&D Center, Chubu Electric Power Co., Midori-ku, Nagoya, Japan
2Gifu Prefectural Institute for Bio-Industrial Technology, Minokamo, Gifu, Japan
3Department of Civil Engineering, Gifu University, 1-1 Yanagido, Gifu, Japan
4Department of Environmental Biology and Chemistry, Faculty of Science, Toyama University, Toyama, Japan

Tóm tắt

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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