title: Copper excess promotes propagation and induces proteomic change in root cultures of Hyoscyamus albus L.
abstract: Hyoscyamus albus L. seedlings respond positively to copper (Cu) excess. In the present study, to understand how roots cope with Cu excess, propagation and proteome composition in the presence of Cu were examined using a root culture system. When H. albus roots were cultured in a medium without Cu, root growth deteriorated. However, in the presence of Cu, root growth increased in a concentration-dependent manner, and vigorous lateral root development was observed at 200 μM Cu. Cu accumulation in the roots increased with the Cu supply. Subcellular fractionation revealed that the highest amount of Cu was present in the cell wall-containing fraction, followed by the soluble fraction. However, the highest specific incorporation of Cu, in terms of fresh weight, was in the mitochondria-rich fraction. High Cu levels enhanced respiration activity. Comparative proteomic analysis revealed that proteins involved in carbohydrate metabolism, de novo protein synthesis, cell division, and ATP synthesis increased in abundance, whereas the proteasome decreased. These results indicate that Cu promotes propagation of H. albus roots through the activation of the energy supply and anabolism. Newly propagated root tissues and newly generated proteins that bind to Cu may provide space and reservoirs for deposition of additional Cu.
authors.affiliation: Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521, Japan.
authors.forename: Ari
authors.initials: A
authors.lastname: Sako
authors.affiliation: Graduate School of Science and Technology, Nagasaki University, Nagasaki 852-8521, Japan.
authors.forename: Jebunnahar
authors.initials: J
authors.lastname: Kandakar
authors.affiliation: Graduate School of Science and Technology, Nagasaki University, Nagasaki 852-8521, Japan.
authors.forename: Noriko
authors.initials: N
authors.lastname: Tamari
authors.affiliation: Graduate School of Science and Technology, Nagasaki University, Nagasaki 852-8521, Japan.
authors.forename: Ataru
authors.initials: A
authors.lastname: Higa
authors.affiliation: Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521, Japan; Division of Biochemistry, Faculty of Fisheries, Nagasaki University, Nagasaki 852-8521, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Yamaguchi
authors.affiliation: Graduate School of Fisheries and Environmental Sciences, Nagasaki University, Nagasaki 852-8521, Japan; Graduate School of Science and Technology, Nagasaki University, Nagasaki 852-8521, Japan. Electronic address: k-yoshie@nagasaki-u.ac.jp.
authors.forename: Yoshie
authors.initials: Y
authors.lastname: Kitamura
mesh_terms: D019069:Cell Respiration / Q000187:drug effects; D003300:Copper / Q000378:metabolism / Q000494:pharmacology*; D032304:Hyoscyamus / Q000187:drug effects* / Q000502:physiology; D018517:Plant Roots / Q000187:drug effects* / Q000502:physiology; D020543:Proteome; D040901:Proteomics
chemical_list: D020543:Proteome; D003300:Copper
keywords: Copper; Heavy metal; Hyoscyamus albus; Proteomics; Root culture; Root respiration