Abstract
In order to follow some of the changes induced by ultraviolet-B (UV-B, 280-320 nm) radiation in Phaseolus vulgaris and Brassica napus, experiments were designed to localize sites of changes in leaves and to correlate some of the physiological and biochemical changes with penetration of UV-B radiation. B.napus was exposed to 8.9 kJ m{sup -2} day{sup -1} biologically effective UV-B radiation (UV-B{sub BE}). The penetration of UV-B radiation into the leaf was followed using a quartz fibre optic microprobe. Monochromatic radiation at 310 nm was decreased by ca 50 and 34% in the adaxial and abaxial epidermis, respectively, in plants not exposed to UV-B, whereas the radiation was decreased by ca 70 and 42%, respectively, in the same region in UV-treated plants. Polychromatic radiation showed a wavelength dependent change mainly for the collimated radiation. The results correlated with the distribution of phenolic compounds analysed from 40 {mu}m paradermal leaf sections. The first adaxial section (40{mu}m) contained 35% of the whole leaf sample flavonoid glycosides in control plants, and 66% in UV-treated plants. Hydroxycinnamic acid derivatives increased by 26% in UV-treated plants relative to controls. The ratio of quercetin to kaempferol derivatives increased from 0.11 in controls to 0.91 in leaves of
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Citation Formats
Yan-Ping, Cen.
Physical, biochemical and physiological effects of ultraviolet radiation on Brassica napus and Phaseolus vulgaris.
Sweden: N. p.,
1993.
Web.
Yan-Ping, Cen.
Physical, biochemical and physiological effects of ultraviolet radiation on Brassica napus and Phaseolus vulgaris.
Sweden.
Yan-Ping, Cen.
1993.
"Physical, biochemical and physiological effects of ultraviolet radiation on Brassica napus and Phaseolus vulgaris."
Sweden.
@misc{etde_10138623,
title = {Physical, biochemical and physiological effects of ultraviolet radiation on Brassica napus and Phaseolus vulgaris}
author = {Yan-Ping, Cen}
abstractNote = {In order to follow some of the changes induced by ultraviolet-B (UV-B, 280-320 nm) radiation in Phaseolus vulgaris and Brassica napus, experiments were designed to localize sites of changes in leaves and to correlate some of the physiological and biochemical changes with penetration of UV-B radiation. B.napus was exposed to 8.9 kJ m{sup -2} day{sup -1} biologically effective UV-B radiation (UV-B{sub BE}). The penetration of UV-B radiation into the leaf was followed using a quartz fibre optic microprobe. Monochromatic radiation at 310 nm was decreased by ca 50 and 34% in the adaxial and abaxial epidermis, respectively, in plants not exposed to UV-B, whereas the radiation was decreased by ca 70 and 42%, respectively, in the same region in UV-treated plants. Polychromatic radiation showed a wavelength dependent change mainly for the collimated radiation. The results correlated with the distribution of phenolic compounds analysed from 40 {mu}m paradermal leaf sections. The first adaxial section (40{mu}m) contained 35% of the whole leaf sample flavonoid glycosides in control plants, and 66% in UV-treated plants. Hydroxycinnamic acid derivatives increased by 26% in UV-treated plants relative to controls. The ratio of quercetin to kaempferol derivatives increased from 0.11 in controls to 0.91 in leaves of UV-treated plants. The leaf epidermis protected the inner leaf tissue where most of the photosynthetic apparatus is located. P. vulgaris was subjected to 6.17 kJ m{sup -2} day{sup -1} UV-B{sub BE} with different levels of visible light. The largest UV-induced changes in photosynthesis, chlorophyll, carotenoids, UV-screening pigments, and surface leaf reflectance occurred under growth conditions of low levels of visible light together with UV radiation.}
place = {Sweden}
year = {1993}
month = {Dec}
}
title = {Physical, biochemical and physiological effects of ultraviolet radiation on Brassica napus and Phaseolus vulgaris}
author = {Yan-Ping, Cen}
abstractNote = {In order to follow some of the changes induced by ultraviolet-B (UV-B, 280-320 nm) radiation in Phaseolus vulgaris and Brassica napus, experiments were designed to localize sites of changes in leaves and to correlate some of the physiological and biochemical changes with penetration of UV-B radiation. B.napus was exposed to 8.9 kJ m{sup -2} day{sup -1} biologically effective UV-B radiation (UV-B{sub BE}). The penetration of UV-B radiation into the leaf was followed using a quartz fibre optic microprobe. Monochromatic radiation at 310 nm was decreased by ca 50 and 34% in the adaxial and abaxial epidermis, respectively, in plants not exposed to UV-B, whereas the radiation was decreased by ca 70 and 42%, respectively, in the same region in UV-treated plants. Polychromatic radiation showed a wavelength dependent change mainly for the collimated radiation. The results correlated with the distribution of phenolic compounds analysed from 40 {mu}m paradermal leaf sections. The first adaxial section (40{mu}m) contained 35% of the whole leaf sample flavonoid glycosides in control plants, and 66% in UV-treated plants. Hydroxycinnamic acid derivatives increased by 26% in UV-treated plants relative to controls. The ratio of quercetin to kaempferol derivatives increased from 0.11 in controls to 0.91 in leaves of UV-treated plants. The leaf epidermis protected the inner leaf tissue where most of the photosynthetic apparatus is located. P. vulgaris was subjected to 6.17 kJ m{sup -2} day{sup -1} UV-B{sub BE} with different levels of visible light. The largest UV-induced changes in photosynthesis, chlorophyll, carotenoids, UV-screening pigments, and surface leaf reflectance occurred under growth conditions of low levels of visible light together with UV radiation.}
place = {Sweden}
year = {1993}
month = {Dec}
}