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[A-5.4 Elucidation of Mechanism of Leaf Injury and Growth Inhibition by Enhanced UV-B]

[Contact Person]

Noriaki Kondo
Team Leader
Regional Environment Division
National Institute for Environmental Studies
Environment Agency
16-2 Onogawa, Tsukuba, Ibaraki 305
Phone +81-298-6111(Ext.356), Fax +81-298-4732

[Total Budget for FY1990-1992]

32,969,000 Yen

[Abstract]

　The effect of UV-B irradiation on plants was investigated using .LM8 cucumber seedlings as plant materials. First, the effect of irradiation with wide band of UV-B was investigated. The growth rate of first leaves was decreased by UV-B radiation. The degree of growth retardation of first leaves caused by UV-B light was almost identical irrespective of duration of irradiation period of UV-B a day, though the retardation was not remarkable in the case of UV-B irradiation for 4 ha day. Next, the action spectrum for growth retardation of intact plants caused by UV irradiation was examined. Cucumber first leaves were irradiated with monochromatic light, using a large spectrograph. The first leaves were severely damaged and retarded in growth rate at 280, 290 and 300nm. From the relation between light intensity and growth rate, an action spectrum for 25% growth retardation was obtained. The inhibitory effects of 280 and 290nm were remarkable compared with those by 300 and 310nm.

[Key Words]

Action spectrum, Cucumber seedling, Growth retardation, Visible injury