Effects of pH and heavy metal concentrations in solution culture on the proton release,growth and elemental composition ofAlyssum murale andRaphanus sativus L. |
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Authors: | M. P. Bernal S. P. McGrath |
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Affiliation: | (1) Department of Organic Resources, Centro de Edafologia y Biologia Aplicada del Segura, CSIC, PO Box 4195, 30080 Murcia, Spain;(2) Department of Soil Science, AFRC Institute of Arable Crop Research, Rothamsted Experimental Station, ALS 2JQ Harpenden, Herts, UK |
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Abstract: | The proton release by a species that can hyperaccumulate nickel (Alyssum murale) and by a non-accumulator (Raphanus sativus L.) was studied at different pH and heavy metal concentrations in solution culture. Both factors influenced the growth and composition of the plants.A. murale was more sensitive than radish to a decrease of pH from 7.0 to 6.0 in the growth medium; plant yield and proton production diminished with decreasing pH. However, yields and proton production of radish only decreased at pH 5.5. The differences in the amounts of protons produced between the hyperaccumulator species and radish were not large enough to conclude that decreasing pH in the rhizosphere ofA. murale is a mechanism for heavy metal solubilization.Nickel concentrations inA. murale followed the typical pattern of an accumulator plant — more Ni was accumulated in the shoots than in the roots. Lower concentrations of Zn and Cd occurred in the shoots than in roots ofA. murale, and also of Ni in radish. The concentrations of Co inA. murale shoots were increased when Zn, Ni and Cd were absent from the nutrient solution. However, Co concentrations in radish shoots were independent of the concentrations of other heavy metals in the growth medium. |
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Keywords: | Alyssum murale heavy metals hyperaccumulator plant metal tolerance pH proton release Raphanus sativus |
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