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

A - Papers appearing in refereed journals

Prajapati, D. H., Ausma, T., De Boer, J., Hawkesford, M. J. and De Kok, L. J. 2020. Nickel toxicity in Brassica rapa seedlings - Impact on sulfur metabolism and mineral nutrient content. Journal fur Kulturpflanzen - Journal of cultivated plants. 72 (9 S), pp. 473-478. https://doi.org/10.5073/JfK.2020.09.03

AuthorsPrajapati, D. H., Ausma, T., De Boer, J., Hawkesford, M. J. and De Kok, L. J.
Abstract

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.

KeywordsToxic metals; Heavy metals; Nickel; Sulfur; Thiols; Glutathione; Mineral composition
Year of Publication2020
JournalJournal fur Kulturpflanzen - Journal of cultivated plants
Journal citation72 (9 S), pp. 473-478
Digital Object Identifier (DOI)https://doi.org/10.5073/JfK.2020.09.03
Open accessPublished as bronze (free) open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDesigning Future Wheat - WP1 - Increased efficiency and sustainability
Publisher's version
Output statusPublished
Publication dates
OnlineJul 2020
Publication process dates
Accepted02 Jun 2020
PublisherEugen Ulmer Gmbh Co
ISSN1867-0911

Permalink - https://repository.rothamsted.ac.uk/item/9815v/nickel-toxicity-in-brassica-rapa-seedlings-impact-on-sulfur-metabolism-and-mineral-nutrient-content

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