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

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Abstract
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 × euramericana were grown on a substrate with B concentrations ranging from 13 to 280 mg kg–1 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–1. Growth was progressively reduced at levels of 168 and 280 mg kg–1. None of the other species survived at these substrate B levels. At leaf B concentrations –1 only 2000 mg kg–1. Average B concentrations of up to 3500 mg kg–1 were found in leaves, while spots within leaves had concentrations >7000 mg kg–1, showing that B accumulation in leaf tissue continued even after the onset of necrosis. The B accumulation ability of P. nigra × euramericana is associated with B hypertolerance in the living tissue and storage of B in dead leaf tissue.

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