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- W1972373645 abstract "Using quartz optical fibres, penetration of both monochromatic (310 nm) and polychromatic UV‐B (280–320 nm) radiation in leaves of Brassica napus L. (cv. Ceres) was measured. Plants were grown under either visible light (750 μmol m −2 s −1 photosynthetically active radiation) or with the addition of 8. 9 KJ m −2 day −1 biologically effective UV‐B (UV‐B BE ) radiation. Results showed that of the 310 nm radiation that penetreated the leaf, 90% was within the intial one third of the leaf with high attenuation in the leaf epidermis, especially in UV‐treated plants. Polychromatic UV‐B radiation, relative to incident radiation, showed a relatively uniform spectral distribution within the leaf, except for collimated radiation. Over 30% of the UV‐screening pigments in the leaf, including flavonoids, were found in the adaxial epidermal layer, making this layer less transparent to UV‐B radiation than the abaxial epidermis, which contained less than 12% of the UV‐screening pigments. UV‐screening pigments increased by 20% in UV‐treated leaves relative to control leaves. Densely arranged epicuticular wax on the adaxial leaf surface of UV‐treated plants may have further decreased penetration of UV‐B radiation by reflectance. An increased leaf thickness, and decreases in leaf area and leaf dry weight were also found for UV‐treated plants." @default.
- W1972373645 created "2016-06-24" @default.
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- W1972373645 date "1993-03-01" @default.
- W1972373645 modified "2023-09-27" @default.
- W1972373645 title "The effect of exposure to enhanced UV‐B radiation on the penetration of monochromatic and polychromatic UV‐B radiation in leaves of Brassica napus" @default.
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- W1972373645 doi "https://doi.org/10.1111/j.1399-3054.1993.tb01727.x" @default.
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