Effect of Rare Earths on Plants under Supplementary Ultraviolet-B Radiation: Ⅱ. Effect of Cerium on Antioxidant Defense System in Rape Seedlings under Supplementary Ultraviolet-B Radiation
来源期刊：JOURNAL OF RARE EARTHS2006年第3期
论文作者：Liang Chanjuan Tao Wenyi Huang Xiaohua Zhou Qing
Key words：cerium; elevated UV-B radiation; rape seedlings; protective enzymes; membrane permeability; rare earths;
Abstract: Effects of cerium (Ce3 + ) on membranous protective enzymes in rape seedlings exposed to two levels of enhanced ultraviolet-B radiation (UV-B, 280 ～ 320 nm) were studied by hydroponics in the laboratory. The results show that the chlorophyll content decreases and membrane permeability increases in the leaves under UV-B irradiation with an intenposed to a low level of UV-B radiation. POD activity in leaves exposed to a high level of UV-B radiation is enhanced constantly. The sensitivities of these enzymes to UV-B radiation are SOD ＞ CAT ＞ POD. The injury by UV-B radiation on the functions of protective enzymes is lightened, their ability to scavenge radicals is improved, and the membrane permeability is maintained by Ce. Furthermore, the protective effect of cerium is more obvious in plants exposed to low levels of UV-B radiation than to high levels of it. Accordingly, all results prove that the protective effect of Ce on plants under UV-B radiation is realized through the protective system of plants.
Liang Chanjuan1，Tao Wenyi1，Huang Xiaohua2，Zhou Qing1
(1.The Key Laboratory of Industrial Biotechnology, Ministry of Education, Wuxi 214036, China;
2.College of Chemistry & Environmental Science, Nanjing Normal University, Nanjing 210097, China)
Abstract:Effects of cerium (Ce3 + ) on membranous protective enzymes in rape seedlings exposed to two levels of enhanced ultraviolet-B radiation (UV-B, 280 ～ 320 nm) were studied by hydroponics in the laboratory. The results show that the chlorophyll content decreases and membrane permeability increases in the leaves under UV-B irradiation with an intenposed to a low level of UV-B radiation. POD activity in leaves exposed to a high level of UV-B radiation is enhanced constantly. The sensitivities of these enzymes to UV-B radiation are SOD ＞ CAT ＞ POD. The injury by UV-B radiation on the functions of protective enzymes is lightened, their ability to scavenge radicals is improved, and the membrane permeability is maintained by Ce. Furthermore, the protective effect of cerium is more obvious in plants exposed to low levels of UV-B radiation than to high levels of it. Accordingly, all results prove that the protective effect of Ce on plants under UV-B radiation is realized through the protective system of plants.
Key words:cerium; elevated UV-B radiation; rape seedlings; protective enzymes; membrane permeability; rare earths;
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