科研成果
| 论文编号: | |
| 第一作者所在部门: | 生态研究中心 |
| 论文题目: | Growth and photosynthetic responses of Picea asperata seedlings to enhanced ultraviolet-B and to nitrogen supply |
| 作者: | 姚晓琴 |
| 全部作者: | Xiaoqin Yao, Qing Liu, Chao Han |
| 论文出处: | |
| 刊物名称: | BRAZILIAN JOURNAL OF PLANT PHYSIOLOGY |
| 年: | 2008 |
| 卷: | 20 |
| 期: | 1 |
| 页: | 11-18 |
| 联系作者: | 刘庆 |
| 收录类别: | |
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| 摘要 : | Ultraviolet-B (UV-B) radiation and nitrogen are expected to increase simultaneously with future changes in global climate. In this study, growth and photosynthetic responses of Picea asperata seedlings to enhanced UV-B and to nitrogen supply were studied. The experimental design included two levels of UV-B treatments (ambient UV-B, 11.02 kJ m-2 d-1; enhanced UV-B, 14.33kJ m-2 d-1) and two nitrogen levels (0; 20 g N m-2) to determine whether nitrogen can alleviate the negative impacts of enhanced UV-B on seedling growth and photosynthesis. Enhanced UV-B significantly inhibited plant growth and impaired net photosynthetic rate, stomatal conductance, transpiration rate, the light-saturated assimilation rate, assimilation capacity, light compensation point, dark respiration rate, apparent quantum yield, photosynthetic pigments and maximum quantum yield of photosynthesis of P. asperata seedlings, whereas minimal fluorescence and intercellular CO2 concentration increased by enhanced UV-B. On the other hand, nitrogen supply improved the photosynthetic performance and plant growth, but only under ambient UV-B. In fact, nitrogen supply could not alleviate the photosynthetic impairments in P. asperata seedlings exposed to enhanced UV-B radiation. |
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