| 摘要: |
| 采用叶绿素荧光分析技术对孔石莼(Ulva pertusa)在不同温度及光照强度影响下的光合作用活性进行研究。结果表明孔石莼在温度相对较低的10℃和20℃下光合活性较强, 而在较高的30℃下, 光合作用受到抑制, 处于光抑制状态的藻体能够通过加强自身热耗散以及启动光系统间的状态转换来实现逆境下的光保护, 孔石莼对光照依赖性较低, 当光照强度超过100 μmol/(m2·s)时即达到光饱和, 孔石莼在高光强下同样表现出很强的光保护能力。孔石莼对环境具有很强的适应能力与其高效的光合作用调控、保护机制密切相关。 |
| 关键词: 孔石莼(Ulva pertusa) 光合作用 状态转换 光保护 |
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| 基金项目:国家自然科学基金资助项目(30970302, 30830015); 天津市海洋资源与化学重点实验室( 天津科技大学) 开放基金资助项目(200903) |
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| Effects of temperature and light on photosynthesis of Ulva pertusa |
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| Abstract: |
| The effects of temperature and light on photosynthetic performance of Ulva pertusa were investigated by measuring in vivo chlorophyll fluorescence of PSⅡ and absorbance of PSⅠ. Photosynthetic activity was highter 10℃ or 20℃, but it was inhibited 30℃ or under higher light intensity beyond the light saturation, which stimulated stronger heat dissipation and state transition in photosystems as effective regulations for photoprotection. Photosynthesis of U. pertusa was saturated when under light intensity of 100 μmol/(m2·s) and the effective photoprotective capacity was detected at higher light intensity beyond the light saturation point. U. pertusa showed higher adaptability to envoronment, which is closely related to its highly-efficient photosythetic regulation system. |
| Key words: Ulva pertusa photosynthesis state transition photoprotection |
