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A-5.1 Effects of enhanced UV-B on Forest Ecosystem

[Contact Person]

Michiaki Okano
Senior Researcher
Dept.of Forest Environment
Forestry and Forest Products Research Inst.
Forestry Agency,Ministry of Agriculture,Forestry and Fisheries
1 Matsuno-sato,Kukizaki-machi,Inashiki-gun,Ibaraki 305,JAPAN
Phone +81-298-73-3211(Ext.373), Fax +81-298-74-3720
e-mail okanom@ffpri.affrc.go.jp

Total Budget for FY1996-FY1998

44,574,000Yen (FY1998;14,483,000Yen)

Abstract

UV-B irradiation to young seedlings of Spruce and Beech or other tree spieses caused inhibition of height growth but volume of dry matter. Intensive UV-B irradiation to young seedlings of Spruce and Beech or others caused inhibition of height growth and volume growth of dry matter. Also the growth inhibition was caused in the condition without any UV-B irradiation. Moderate UV-B irradiation caused good results. No information has so far been available of the effect of UVB supplement on tree DNA. This is the first report to describe UVB-induced DNA damage in growing tree leaves under artificial lighting.
Intensities of two peaks in HPLC spectrum were clearly increased in extract of UV-treated Spruce, and their isolations and identifications are under progress now to determine their correlation with a sensitivity to the UV-B. The accumulated secondary metabolites were isolated and identified as kaenpferol-3-glucoside.
Total UV-B irradiance reached to ground was fairly larger at high altitude alpine zone absolutely and relatively. The difference of total UV-B irradiance depended on the direct component.

[Key Words]

UV-B, Forest Ecosystem, UV-B Stress