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-1CeCl3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=0.15W.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.
Effect of Ce( Ⅲ ) on photochemical reaction activity in soybean seedlings exposed to uhraviolet-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 Mg^2+ -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(Tt = O. 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( m ) 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 J, 50.9% - 23.3% (%), 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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2007年第6期1388-1391,共4页
Environmental Science
基金
国家发展改革委员会稀土专项基金项目(IFZ20051210)
国家自然科学基金项目(30570323)
江苏省教育厅教改基金项目(518)
关键词
稀土铈
UV-B辐射
大豆幼苗
净光合速率
光化学反应
cerium
UV-B radiation
soybean seedling
net photosynthesis rate
photochemical reaction activity