title: Development of UV defense mechanisms during growth of spinach seedlings.
abstract: Changes in UV defense mechanisms were studied during the growth periods of spinach seedlings grown under the white light, which did not contain UV-B light. DNA photolyase activity in the photorepair of cyclobutane pyrimidine dimers in spinach seedlings was high in the early growth phase (cell division phase) and declined thereafter, whereas UV-absorbing substances accumulated throughout the growth period acted as a major UV-defense mechanism in the cell expansion phase.
authors.affiliation: Department of Bioscience and Technology, School of Engineering, Hokkaido Tokai University, Sapporo, 005-8601, Japan. m-hada@iae.kyoto-u.ac.jp
authors.forename: M
authors.initials: M
authors.lastname: Hada
authors.forename: K
authors.initials: K
authors.lastname: Hino
authors.forename: Y
authors.initials: Y
authors.lastname: Takeuchi
mesh_terms: D000064:Acclimatization / Q000502:physiology; D002455:Cell Division; D004255:Deoxyribodipyrimidine Photo-Lyase / Q000378:metabolism; D008027:Light; D018520:Plant Shoots / Q000254:growth & development / Q000528:radiation effects; D011740:Pyrimidine Dimers / Q000378:metabolism; D011836:Radiation Tolerance; D018724:Spinacia oleracea / Q000235:genetics / Q000528:radiation effects*; D014466:Ultraviolet Rays
chemical_list: D011740:Pyrimidine Dimers; D004255:Deoxyribodipyrimidine Photo-Lyase