Pb hyperaccumulation and tolerance in common buckwheat (Fagopyrum esculentum Moench).
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.
Tamura
Hideo
H
Biotechnology Group, Energy Application R&D Center, Chubu Electric Power Co., Ohdaka-cho, Midori-ku, Nagoya, Japan. tamura.hideo@chuden.co.jp
Honda
Munechika
M
Sato
Takeshi
T
Kamachi
Hiroyuki
H
D000222:Adaptation, Physiological; D019612:Fagopyrum / Q000254:growth & development / Q000378:metabolism* / Q000502:physiology; D007854:Lead / Q000032:analysis / Q000378:metabolism*; D012987:Soil / Q000032:analysis
D012987:Soil; D007854:Lead