Development of a biotic ligand model (BLM) predicting nickel toxicity to barley (Hordeum vulgare)
Lock, K.; Van Eeckhout, H.; De Schamphelaere, K.A.C.; Criel, P.; Janssen, C.R. (2007). Development of a biotic ligand model (BLM) predicting nickel toxicity to barley (Hordeum vulgare). Chemosphere 66(7): 1346-1352. https://dx.doi.org/10.1016/j.chemosphere.2006.07.008
In: Chemosphere. Elsevier: Oxford. ISSN 0045-6535; e-ISSN 1879-1298, meer
A biotic ligand model (BLM) was developed to predict nickel toxicity, affecting root growth of barley (Hordeum vulgare), in nutrient solutions. The extent to which Ca2+, Mg2+, Na+, K+ ions and pH each influenced nickel toxicity was determined. Higher activities of Mg2+ linearly increased the 4 d EC50Nl2+, while Ca2+, Na+, K+ and H+ activities did not significantly influence Ni2+ toxicity. Stability constants for the binding of Ni2+ and Mg2+ to the biotic ligand were obtained: log KNiBL = 5.27 and log KMgBL = 3.47. Further, it was calculated that on average 57% of the biotic ligand sites needed to be occupied by nickel to induce 50% root growth inhibition. Auto-validation of the BLM indicated that predicted EC50s differed from the observed EC50s by a factor of less than 2, indicating that the BLM concept may also be used to predict metal toxicity to terrestrial plants.
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