Ce对UV-B辐射胁迫下大豆幼苗光合作用影响:Ⅰ对光合色素与希尔反应活性的影响  

Effect of Cerium on Photosynthesis in Soybean Seedling Under Supplementary UV-B Radiation Stress:ⅠPhotosynthetic Pigments and Hill Reaction Activity

作　　者：梁婵娟[1] 李娟[1] 黄晓华[2] 周青[1] 

机构地区：[1]江南大学工业生物技术教育部重点实验室,江苏无锡214036 [2]南京师范大学化学与环境科学学院,江苏南京210097

出　　处：《农业环境科学学报》2006年第3期576-579,共4页Journal of Agro-Environment Science

基　　金：国家发改委稀土专项基金(GFZ040628);国家自然科学基金(20471030)

摘　　要：用水培法研究Ce(Ⅲ)对紫外辐射(UV-B,280￣320nm)胁迫下油菜幼苗光合色素含量与希尔反应活性变化对光合作用的影响。静态数据表明,20mg·L-1CeCl3能有效减缓紫外辐射(T1/0.15W·m-2和T2/0.45W·m-2)胁迫所导致的光合速率下降,叶绿素与类胡萝卜素含量减少及Hill反应活性降低,使得Ce+UV-B组各项指标虽低于CK,但明显优于UV-B组。动态曲线显示,Ce减缓了UV-B胁迫期各项指标的下降趋势,加快恢复期的上升速度,且最终达到较好的恢复效果。通过对Chl含量、Hill反应活性与Pn的相关统计学分析发现,Ce对UV-B辐射胁迫下Hill反应活性和叶绿素含量的调节具有改善光合功能的作用,且对Hill反应活性的调节作用大于叶绿素含量。Effect of cerium （Ce^3＋） on photosynthesis rate, photosynthetic pigments content and Hill reaction activity in soybean seedlings exposed to two levels of uhraviolet-B radiation （UV-B, 280-320 nm） was studied with hydroponics under laboratory conditions. The results showed that UV-B radiation caused the decrease in photosynthesis rate, chlorophyll and carotenoid content, as well as Hill reaction activity. CeCl3 could improve photosynthesis action by promoting photosynthesis rate, increasing chlorophyll and carotenoid content, and stimulating the activity of Hill reaction. Consequently, all the indexes with Ce＋UV-B treatment were better than those with UV-B treatment. Through the analysis on the dynamic curves of photosynthesis rate, chlorophyll content and Hill reaction activity with six treatments during stress and recovery phase, we found that the decreased rate of three indices with Ce＋UV-B treatments during stress phase was lower, whereas the restored rate during recovery phase was higher, and therefore showed better restoring effect, compared to those of UV-B treatments. All these indicated that Ce could alleviate the inhibition of UV-B on photosynthesis in plants to a certain extent. In addition, according to the coefficients of correlation between chlorophyll content, Hill reaction activity and photosynthesis rate, we considered that the change of Hill reaction activity have a relatively obvious influence on photosynthesis action.

关 键 词：稀土铈 UV—B辐射 大豆幼苗 光合色素 希尔反应活性 

分 类 号：S565.1[农业科学—作物学]