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Plant and Cell Physiology, 2001, Vol. 42, No. 7 784-787
© 2001 Oxford University Press

Development of UV Defense Mechanisms during Growth of Spinach Seedlings

Megumi Hada1,3,4, Keisuke Hino2 and Yuichi Takeuchi1

1 Department of Bioscience and Technology, School of Engineering, Hokkaido Tokai University, Sapporo, 005-8601 Japan 2 Department of Biology, Faculty of Science, Kohnan University, Kobe, 658-8501 Japan

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.

3 Corresponding author: E-mail, m-hada@iae.kyoto-u.ac.jp; Fax, +81-774-38-3512.

4 Present address: Institute of Advanced Energy, Kyoto University, Gokanosho, Uji, Kyoto, 611-011 Japan.


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