title: The induction of bystander mutagenic effects in vivo by alpha-particle irradiation in whole Arabidopsis thaliana plants.
abstract: Our previous studies demonstrated distant/abscopal bystander effects in A. thaliana seeds and embryos; the postembryonic development of bystander tissues, such as root hair differentiation, primary root elongation, lateral root initiation and survival, were inhibited significantly by localized irradiation with microbeam protons and low-energy ions. In the present study, we further investigated radiation-induced bystander mutagenic effects in vivo in A. thaliana plants using homologous recombination (HR) and the expression level of the HR-related AtRAD54 gene as mutagenic end points. We found that alpha-particle irradiation of distal primary roots of young seedlings resulted in a significant increase in the frequency of HR in the aerial plants; the increased induction of HR occurred in every true leaf over the course of rosette development. Moreover, we also found that localized alpha-particle irradiation of roots induced a short-term up-regulated expression of the HR-related AtRAD54 gene in the nonirradiated aerial plants. These results suggested the existence of bystander mutagenic effects in vivo in plants. Treatment with the ROS scavenger DMSO dramatically reduced the effects of localized root irradiation on the induction of HR and expression of the AtRAD54 gene in bystander tissues, suggesting that ROS play a critical role in mediating the bystander mutagenic effects in plants.
authors.affiliation: Key Laboratory of Ion Beam Bio-engineering, Institute of Plasma Physics of Chinese Academy of Sciences, Hefei 230031, China.
authors.forename: Fanghua
authors.initials: F
authors.lastname: Li
authors.forename: Ping
authors.initials: P
authors.lastname: Liu
authors.forename: Ting
authors.initials: T
authors.lastname: Wang
authors.forename: Po
authors.initials: P
authors.lastname: Bian
authors.forename: Yuejin
authors.initials: Y
authors.lastname: Wu
authors.forename: Lijun
authors.initials: L
authors.lastname: Wu
authors.forename: Zengliang
authors.initials: Z
authors.lastname: Yu
mesh_terms: D000512:Alpha Particles; D017360:Arabidopsis / Q000235:genetics / Q000502:physiology* / Q000528:radiation effects; D029681:Arabidopsis Proteins / Q000235:genetics / Q000528:radiation effects; D024201:Bystander Effect / Q000502:physiology*; D004265:DNA Helicases; D004268:DNA-Binding Proteins / Q000235:genetics / Q000528:radiation effects; D018506:Gene Expression Regulation, Plant; D016296:Mutagenesis; D009152:Mutagenicity Tests; D018517:Plant Roots / Q000502:physiology / Q000528:radiation effects; D011995:Recombination, Genetic / Q000528:radiation effects; D036226:Seedlings / Q000502:physiology / Q000528:radiation effects; D015854:Up-Regulation
chemical_list: D029681:Arabidopsis Proteins; D004268:DNA-Binding Proteins; C518800:RAD54 protein, Arabidopsis; D004265:DNA Helicases