title: [Research on the cytotoxic and genotoxic effects of rare-earth element holmium to Vicia faba].
abstract: Crystal of nitrate, made by the reaction of holmium trioxide and nitric acid, was dissolved in distilled water, thus diluted into gradient solution. Soaked in the solution for 6 hours (6h), the root tips of Vicia faba were then recovered and cultivated for 22 h and 24 h, respectively. By observing the change of root tips and calculating the frequency of micronucleus (FMN), the frequency of chromosomal aberrations(CAF) and mitosis index (MI),we find that the dosage below 4mg/L (expressed by concentration of holmium trioxide) could accelerate the growth of root tips of Vicia faba. CAF and FMN increased while MI decreased with the rise of concentrations. From it a dosage effect relationship is clearly seen. And it indicated that the rare earth element holmium has certain cytotoxic and genotoxic effects. Furthermore, the different recovery groups have different FMN, CAF and MI, and the difference lies in the fact that FMN of 22 h recovery group was lower than that of 24 h recovery group, while CAF and MI were higher than those of 24 h recovery group. The results suggest that the statistics of FMN should be made after that of CAF.
authors.affiliation: Department of Biology, Xuzhou Normal University, Xuzhou 221116, China. quai2003@126.com
authors.forename: Ai
authors.initials: A
authors.lastname: Qu
authors.forename: Cheng-Run
authors.initials: CR
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Bo
mesh_terms: D002467:Cell Nucleus / Q000187:drug effects; D002869:Chromosome Aberrations / Q000139:chemically induced*; D032461:Chromosomes, Plant / Q000187:drug effects*; D004305:Dose-Response Relationship, Drug; D006695:Holmium / Q000633:toxicity*; D015162:Micronucleus Tests; D008938:Mitosis / Q000187:drug effects*; D008940:Mitotic Index; D018517:Plant Roots / Q000187:drug effects / Q000235:genetics; D031307:Vicia faba / Q000187:drug effects* / Q000235:genetics
chemical_list: D006695:Holmium