title: Expression differences for genes involved in lignin, glutathione and sulphate metabolism in response to cadmium in Arabidopsis thaliana and the related Zn/Cd-hyperaccumulator Thlaspi caerulescens.
abstract: Cadmium (Cd) is a widespread, naturally occurring element present in soil, rock, water, plants and animals. Cd is a non-essential element for plants and is toxic at higher concentrations. Transcript profiles of roots of Arabidopsis thaliana (Arabidopsis) and Thlaspi caerulescens plants exposed to Cd and zinc (Zn) are examined, with the main aim to determine the differences in gene expression between the Cd-tolerant Zn-hyperaccumulator T. caerulescens and the Cd-sensitive non-accumulator Arabidopsis. This comparative transcriptional analysis emphasized the role of genes involved in lignin, glutathione and sulphate metabolism. Furthermore the transcription factors MYB72 and bHLH100 were studied for their involvement in metal homeostasis, as they showed an altered expression after exposure to Cd. The Arabidopsis myb72 knockout mutant was more sensitive to excess Zn or iron (Fe) deficiency than wild type, while Arabidopsis transformants overexpressing bHLH100 showed increased tolerance to high Zn and nickel (Ni) compared to wild-type plants, confirming their role in metal homeostasis in Arabidopsis.
authors: Laboratory of Genetics, Wageningen University, Arboretumlaan 4, 6703 BD Wageningen, The Netherlands.
authors: Judith E
authors: JE
authors: van de Mortel
authors: Henk
authors: H
authors: Schat
authors: Perry D
authors: PD
authors: Moerland
authors: Emiel
authors: E
authors: Ver Loren van Themaat
authors: Sjoerd
authors: S
authors: van der Ent
authors: Hetty
authors: H
authors: Blankestijn
authors: Artak
authors: A
authors: Ghandilyan
authors: Styliani
authors: S
authors: Tsiatsiani
authors: Mark G M
authors: MG
authors: Aarts
mesh_terms: D017360:Arabidopsis / Q000187:drug effects* / Q000378:metabolism; D002104:Cadmium / Q000378:metabolism / Q000494:pharmacology*; D020869:Gene Expression Profiling; D018506:Gene Expression Regulation, Plant / Q000187:drug effects; D017343:Genes, Plant; D005978:Glutathione / Q000378:metabolism*; D007501:Iron / Q000378:metabolism / Q000494:pharmacology; D008031:Lignin / Q000378:metabolism*; D009532:Nickel / Q000378:metabolism / Q000494:pharmacology; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013431:Sulfates / Q000378:metabolism*; D031227:Thlaspi / Q000187:drug effects* / Q000378:metabolism; D014158:Transcription, Genetic / Q000187:drug effects; D015032:Zinc / Q000378:metabolism / Q000494:pharmacology
chemical_list: D010940:Plant Proteins; D013431:Sulfates; D002104:Cadmium; D009532:Nickel; D008031:Lignin; D007501:Iron; D005978:Glutathione; D015032:Zinc