title: Copper toxicity in Chinese cabbage is not influenced by plant sulphur status, but affects sulphur metabolism-related gene expression and the suggested regulatory metabolites.
abstract: The toxicity of high copper (Cu) concentrations in the root environment of Chinese cabbage (Brassica pekinensis) was little influenced by the sulphur nutritional status of the plant. However, Cu toxicity removed the correlation between sulphur metabolism-related gene expression and the suggested regulatory metabolites. At high tissue Cu levels, there was no relation between sulphur metabolite levels viz. total sulphur, sulphate and water-soluble non-protein thiols, and the expression and activity of sulphate transporters and expression of APS reductase under sulphate-sufficient or-deprived conditions, in the presence or absence of H2 S. This indicated that the regulatory signal transduction pathway of sulphate transporters was overruled or by-passed upon exposure to elevated Cu concentrations.
authors: Laboratory of Plant Physiology, Centre of Ecological and Evolutionary Studies, University of Groningen, Groningen, the Netherlands.|Institute of Agricultural Sciences, University of the Punjab, Lahore, Pakistan.
authors: M
authors: M
authors: Shahbaz
authors: Laboratory of Plant Physiology, Centre of Ecological and Evolutionary Studies, University of Groningen, Groningen, the Netherlands.
authors: C E E
authors: CE
authors: Stuiver
authors: Laboratory of Plant Physiology, Centre of Ecological and Evolutionary Studies, University of Groningen, Groningen, the Netherlands.
authors: F S
authors: FS
authors: Posthumus
authors: Plant Biology and Crop Science Department, Rothamsted Research, Harpenden, UK.
authors: S
authors: S
authors: Parmar
authors: Plant Biology and Crop Science Department, Rothamsted Research, Harpenden, UK.
authors: M J
authors: MJ
authors: Hawkesford
authors: Laboratory of Plant Physiology, Centre of Ecological and Evolutionary Studies, University of Groningen, Groningen, the Netherlands.
authors: L J
authors: LJ
authors: De Kok
mesh_terms: D001937:Brassica / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*; D003300:Copper / Q000633:toxicity*; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D006862:Hydrogen Sulfide / Q000494:pharmacology; D013455:Sulfur / Q000378:metabolism*
chemical_list: D013455:Sulfur; D003300:Copper; D006862:Hydrogen Sulfide
keywords: APS reductase; Abiotic stress; H
  2
  S; heavy metals; sulphate deprivation; sulphate reduction; sulphate transporters; sulphur assimilation; thiol compounds