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Nickel toxicity in Brassica rapa seedlings: Impact on sulfur metabolism and mineral nutrient content

Prajapati, D. H., Ausma, T., De Boer, J., Hawkesford, M. J. & De Kok, L. J., 1-Sep-2020, In : J. Cultiv. Plants. 72, 9, p. 473-478 6 p.

Research output: Contribution to journalArticleAcademicpeer-review

Throughout the world anthropogenic activity has resulted in enhanced soil nickel (Ni2+) levels, which may negatively affect plant productivity. The physiological background of Ni2+ phytotoxicity is still largely unclear. Ten-day exposures of Brassica rapa seedlings to 1, 2 and 5 μM NiCl2 resulted in strongly enhanced tissue Ni levels, a decreased biomass production and leaf chlorosis at ≥ 2 μM Ni2+. At 5 μM Ni2+ plant growth was completely halted. Ni toxicity occurred when the content of the shoot exceeded 1.0 μmol g–1 dry weight and that of the root, 23 μmol g–1 dry weight. Ni2+ exposure at ≤ 2 μM only slightly affected the mineral nutrient content of both shoot and root. Hence, Ni2+ exposure hardly affected the sulfur metabolite content of the plant. At ≥ 1 μM Ni2+ the total sulfur content of the root was only slightly lowered, which could fully be ascribed to a decreased sulfate content. Moreover, the water-soluble non-protein thiol content of both shoot and root was only enhanced at 5 μM Ni2+. From these results it was clear that sulfur metabolism was unlikely to be directly involved in the Ni2+ tolerance mechanisms of B. rapa.
Original languageGerman
Pages (from-to)473-478
Number of pages6
JournalJ. Cultiv. Plants
Volume72
Issue number9
Publication statusPublished - 1-Sep-2020

    Keywords

  • Toxic metals, Heavy metals, Nickel, Sulfur, Thiols, Glutathione, Mineral composition

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