| Ce(Ⅲ)对UV-B辐射胁迫下大豆幼苗光化学反应的影响 |
| 摘要点击 1395 全文点击 989 投稿时间：2006-06-28 修订日期：2006-08-11 |
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| 中文关键词 稀土铈 UV-B辐射 大豆幼苗 净光合速率 光化学反应 |
| 英文关键词 cerium UV-B radiation soybean seedling net photosynthesis rate photochemical reaction activity |
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| 中文摘要 |
| 用水培法研究Ce(Ⅲ)对UV-B辐射胁迫下大豆幼苗光化学反应的影响.结果表明, 20 mg·L-1 CeCl3使大豆幼苗净光合速率(Pn)、Hill反应、Mg2+-ATPase活性与光合磷酸化活力4项指标较对照提高23.2%～14.3%; 有效抑制UV-B辐射(T1=0.15 W·m-2和T2=0.45 W·m-2)胁迫下4项指标下降, 4项指标降幅［Ce(Ⅲ)+T1为36.6%～15.9%，Ce(Ⅲ)+T2为65.6%～33.2%］小于对应的UV-B辐射组(T1为50.9%～23.3%，T2为77.3%～51.4%). 动态变化显示, Ce(Ⅲ)减缓了胁迫期4项指标的下降趋势,促进了恢复期4项指标上升幅度. 说明Ce(Ⅲ)通过减轻UV-B辐射对大豆幼苗光化学反应的伤害, 遏制UV-B辐射胁迫下大豆幼苗Pn下降. |
| 英文摘要 |
| Effect of Ce(Ⅲ) on photochemical reaction activity in soybean seedlings exposed to ultraviolet-B radiation (UV-B, 280～320 nm) was studied with hydroponics under laboratory conditions. The results showed that CeCl3 (20 mg·L-1) could improve photosynthesis action and net photosynthesis rate, the Mg2+-ATPase activeness, the photosynthetic phosphorylation active and stimulate the activity of Hill reaction(23.2%～14.3%).And Ce(Ⅲ) could alleviate the inhibition of UV-B(T1=0.15 W·m-2 and T2=0.45 W·m-2) on the four indexes above in plants to a certain extent,and the decreasing degrees of the indexes under Ce(Ⅲ) and UV-B stress were lower than those only under UV-B stress, which were 36.6%～ 15.9% ［Ce(Ⅲ)+T1］, 65.6%～33.2%［Ce(Ⅲ)+T2］, 50.9%～23.3%(T1), 77.3%～51.4%(T2) respectively. The dynamic data indicated that Ce(Ⅲ) could alleviate the inhibition of UV-B on the four indexes above while promoting without UV-B stress. The results showed that Ce(Ⅲ) could alleviate the decrease in the net photosynthesis rate by lightening the damage of the photochemical reaction activity on the soybean seedings under UV-B stress. |
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