Boron Accumulation and Toxicity in Hybrid Poplar (Populus nigra 脳 euramericana)

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• 作者：Rainer Rees ; Brett H. Robinson ; Manoj Menon ; Eberhard Lehmann ; Madeleine S. G眉nthardt-Goerg ; Rainer Schulin
• 刊名：Environmental Science & Technology
• 出版年：2011
• 出版时间：December 15, 2011
• 年：2011
• 卷：45
• 期：24
• 页码：10538-10543
• 全文大小：812K
• 年卷期：v.45,no.24(December 15, 2011)
• ISSN：1520-5851

文摘

Poplars accumulate high B concentrations and are thus used for the phytomanagement of B contaminated soils. Here, we performed pot experiments in which Populus nigra 脳 euramericana were grown on a substrate with B concentrations ranging from 13 to 280 mg kg^鈥? as H₃BO₃. Salix viminalis, Brassica juncea, and Lupinus albus were grown under some growing conditions for comparison. Poplar growth was unaffected at soil B treatment levels up to 93 mg kg^鈥?. Growth was progressively reduced at levels of 168 and 280 mg kg^鈥?. None of the other species survived at these substrate B levels. At leaf B concentrations <900 mg kg^鈥? only <10% of the poplar leaf area showed signs of toxicity. Neutron radiography revealed that chlorotic leaf tissues had B concentrations of 1000鈥?000 mg kg^鈥?, while necrotic tissues had >2000 mg kg^鈥?. Average B concentrations of up to 3500 mg kg^鈥? were found in leaves, while spots within leaves had concentrations >7000 mg kg^鈥?, showing that B accumulation in leaf tissue continued even after the onset of necrosis. The B accumulation ability of P. nigra 脳 euramericana is associated with B hypertolerance in the living tissue and storage of B in dead leaf tissue.