Development of UV defense mechanisms during growth of spinach seedlings.
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.
Hada
M
M
Department of Bioscience and Technology, School of Engineering, Hokkaido Tokai University, Sapporo, 005-8601, Japan. m-hada@iae.kyoto-u.ac.jp
Hino
K
K
Takeuchi
Y
Y
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
D011740:Pyrimidine Dimers; D004255:Deoxyribodipyrimidine Photo-Lyase