Abstract
This study evaluated the possibility of improving the macronutrient status of Cd-stressed white mustard ‘Rota’ using intensive S nutrition. Three S-SO4 (2, 6, 9 mM S) and four CdCl2 doses (0, 0.0002, 0.02, 0.04 mM Cd) in the Hoagland’s nutrient solution were conducted for 14 days. High S supply (6 or 9 mM) appears, to some extent, to affect positively the macronutrient status of Cd-stressed mustard. It increased roots and shoots contents of K and S, without significant changes in P content. Simultaneously, Mg content in shoots and roots remained stable, but Mg bioaccumulation was elevated. Shoot Ca content at the lowest and medium Cd dose decreased, whilst was unaffected at the highest Cd treatment. Intensive S nutrition of Cd-stressed mustard increased root N content and accumulation at the highest Cd concentration, but the N content dropped in above-ground parts. The bioaccumulation of remained macronutrients in general was substantially elevated together with enhanced Cd accumulation. Thus, the intensive S nutrition can enhance mustard tolerance to Cd stress by improvement macronutrients relations in plants, and S supplementation may be recommended for mustard cultivation on the Cd-contaminated areas.
Highlights
The purpose of this study was to investigate the changes in macronutrient content of Cd-stressed white mustard (Sinapis alba L.) supplied with various S doses and thereby to evaluate the possibility of improving the macronutrient status of plants altered by Cd presence using intensive S nutrition
S-Cd interactions play a crucial role in white mustard ‘Rota’ macronutrient status
Our research demonstrated that Cd exposure (0.0002–0.04 mM) results in various unfavourable changes in the macronutrient content and accumulation as well as raises Cd bioaccumulation in the roots and shoots of mustard
Summary
Brassica hirta Moench, B. alba L.), is native to southern Europe, and the cultivation of this oilseed species has spread to a majority of temperature regions of the world, mostly in Canada and Nepal, which are the global leaders of white mustard. Russia, Czech Republic, Italy, the UK and the Netherlands are mentioned as the European leaders in the production of this species (Prakash et al 2011; Jankowski et al 2015). Production assessment of this important agricultural oil seed crop species in Poland is not easy on account of the prevailing cultivation of this species as a catch crop.
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