科研成果
| 论文编号: | doi: 10.1111/j.1399-3054.2008.01128.x |
| 第一作者所在部门: | 生态研究中心 |
| 论文题目: | Interactions between drought, ABA application and supplemental UV-B in Populus yunnanensis |
| 作者: | 段宝利，轩祖迎 |
| 全部作者: | Baoli Duan,Zuying Xuan,Xiaolu Zhang,Helena Korpelainen,Chunyang Li |
| 论文出处: | |
| 刊物名称: | Physiologia Plantarum |
| 年: | 2008 |
| 卷: | 134 |
| 期: | 2 |
| 页: | 257-269 |
| 联系作者: | 李春阳 |
| 收录类别: | |
| 影响因子: | 2.334 |
| 摘要 : | To test whether drought and ABA application alter the effects of enhanced UV-B on the growth and biomass allocation of Populus yunnanensis Dode, cuttings were grown in pots at two ABA levels, two watering regimes and two UV-B levels for one growth season. Exposure to enhanced UV-B radiation significantly decreased plant growth and photosynthesis under well-watered conditions, but these effects were obscured by drought, which alone caused growth reduction. Drought may contribute to masking the effects of UV-B radiation. The accumulation of UV-B absorbing compounds and the increase of the ABA content induced by drought could reduce the effectiveness of UV-B radiation. ABA application did not have large direct effects on biomass accumulation and allocation. Evidence for interactions between UV-B and ABA was detected for only a few measured traits. Therefore, there was little evidence to support a pivotal role for ABA in regulating a centralized whole plant response to enhanced UV-B. Yet, we recorded an ABA-induced decrease in stomatal conductance (gs) and increase in UV-B absorbing compounds and carbon isotope composition (δ13C) in response to enhanced UV-B. The allometric analysis revealed that regression models between root and shoot biomass in response to enhanced UV-B are different for plants under well-watered and drought conditions. Enhanced UV-B led to a significant displacement of the allometric regression line under well-watered condition, while allometric trajectories for both UV-B regimes did not differ significantly under drought condition. |
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