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A-5.4 Research on the effect of increased UV-B radiation on the wild plants.

[Contact Person]

Nobuyoshi Nakajima
Senior Researcher. Biotechnology Research Team
The National Institute for Environmental Studies Environment Agency
Onogawa 16-2, Tsukuba, Ibaraki, 30-5-0053 Japan
Tel: +81-298-50-2490 Fax: +81-298-51-4732
E-mail: naka-320@nies.go.jp

Total Budget for FY1996-FY1998

28,583,000Yen (FY1997 9,514,000Yen)

Abstract

Accumulation of anthocyanins in UV-B irradiated Solidago virgaurea seedling were investigated. Population which is growing in higher altitude accumulated high amount of anthocyanins by UV-B irradiation. They seem to be more sensitive to UV-B in anthocyanin production than that is growing in lower altitude. We have also focus on the UV-B induced lesions in DNA, namely cyclobutane pyrimidine dimer (CPD) and pyrimidine (6,4) pyrimidone in plants. Solar radiation in Iriomote Island accumulated more dimers in cucumber cotyledons than that did in Sapporo. CPD photolyase activity decreased when the leaves maturated. This enzyme activity was induced by UV-A The wavelength-dependence of the CPD photolyase activities in partially purified enzyme from Sorgum bicolor was determined Maximum activity showed between 380 and 420 nm. Changes in the amount of transcripts of AcetylCoA carboxylase genes in Arabidopsis thaliana were investigated. The gene encoding accl was induced by UV-B irradiation.

[Key Words]

Wild plants, flavonods, Solar UV, DNA lesion, Photolyase