Calcium ameliorates the toxicity of sulfate salinity in Brassica rapa

A - Papers appearing in refereed journals

Reich, M., Aghajanzadeh, T. A., Parmar, S., Hawkesford, M. J. and De Kok, L. J. 2018. Calcium ameliorates the toxicity of sulfate salinity in Brassica rapa. Journal of Plant Physiology. 231, pp. 1-8.

AuthorsReich, M., Aghajanzadeh, T. A., Parmar, S., Hawkesford, M. J. and De Kok, L. J.
Abstract

Salinity stress in Brassica, often only associated with osmotic effects and the toxicity of Na+, was more severe when applied as Na2SO4 than as NaCl, indicating that SO42− ions had toxic effects as well. Application of 10 mM calcium in the form of CaCl2 in the growth medium of plants only slightly ameliorated growth impairment by NaCl and KCl, but almost completely prevented negative effects of Na2SO4 and K2SO4 on plant biomass production. This effect was calcium specific, as MgCl2 ameliorated sulfate toxicity to a much lower extent. This sulfate toxicity coincided with a strong decrease in the plant content of calcium and manganese upon sulfate salinity. Application of CaCl2 largely alleviated this decrease, however, it did not prevent the higher tissue concentration of sulfate. CaCl2 prevented the increase in organic sulfur compounds presumably by reducing of relative gene expression of ATP-sulfurylase (ATPS) and adenosine 5′-phosphosulfate reductase (APR) indicating a possible regulation of sulfate assimilation by calcium. The upregulation of the genes encoding for Group 4 sulfate transporters (Sultr4;1 and 4;2) upon sulfate salinity, was absent in the presence of CaCl2. Therefore, additional calcium may facilitate an increased vacuolar capacity for sulfate accumulation.

KeywordsBrassica rapa; Calcium; Sulfate salinity; Sulfate transport; Vacuole
Year of Publication2018
JournalJournal of Plant Physiology
Journal citation231, pp. 1-8
Digital Object Identifier (DOI)doi:10.1016/j.jplph.2018.08.014
Open accessPublished as green open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or code[20:20 Wheat] Maximising yield potential of wheat
Designing Future Wheat (DFW) [ISPG]
DFW - Designing Future Wheat - Work package 1 (WP1) - Increased efficiency and sustainability
Accepted author manuscript
Output statusPublished
Publication dates
Online01 Sep 2018
Publication process dates
Accepted02 May 2018
PublisherElsevier Gmbh, Urban & Fischer Verlag
Copyright licenseCC BY
ISSN0176-1617

Permalink - https://repository.rothamsted.ac.uk/item/848ww/calcium-ameliorates-the-toxicity-of-sulfate-salinity-in-brassica-rapa

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