盐度降低对长心卡帕藻原初光化学反应的影响

黄园; 刘建国; 庞通; 李俊; 林伟

盐度降低对长心卡帕藻原初光化学反应的影响

黄园¹,
刘建国²,
庞通¹,
李俊²,
林伟²

1.
中国科学院海洋研究所生物工程中心,山东青岛 266071;中国科学院研究生院,北京 100049
2.
中国科学院海洋研究所生物工程中心,山东青岛 266071

基金项目: 国家海洋行业公益性科研重点专项"高产卡拉胶海藻的规模栽培、高值加工与近海环境治理新技术示范"(200705010);国家自然科学基金面上项目"产卡拉胶的麒麟菜类热带红藻的生殖过程及调节"(30771638)。

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出版历程
- 收稿日期: 2009-10-02
- 修回日期: 2010-02-02

The changes of primary photochemical reactions in Kappaphycus alvarezii exposed to low salinity

1.
Research and Development Center of Marine Biotech, Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071, China;Graduate School,Chinese Academy of Sciences,Beijing 100049, China
2.
Research and Development Center of Marine Biotech, Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071, China

摘要

摘要: 为探讨大量降雨如何导致热带产胶海藻长心卡帕藻死亡,通过快速叶绿素荧光诱导动力学曲线分析,研究了盐度降低对热带产胶海藻长心卡帕藻光化学反应的影响,结果表明,盐度降低对PSⅡ反应中心、供体和受体侧的光化学过程产生不同程度的影响。盐度为28时,虽然反应中心开放程度下降11%,受体侧PQ库减小,Q_A被还原次数下降,反应中心吸收光能出现下降同时热耗散能量出现增加,但是单位面积反应中心RC/CS₀,RC/CS_m数量显
- 长心卡帕藻 /
- 低盐胁迫 /
- 原初光化学反应
Abstract: The changes of primary photochemical reactions in Kappaphycus alvarezii exposed to low-salinity stress were studied by analyzing their transient chlorophyll a fluorescence dynamic curves. The results show that the main photochemical reaction of PSⅡ, its donor and acceptor sides vary widely in K. alvarezii while being exposed to low-salinity.Although many un-favored profiles like the fraction of PSⅡ centers closed, the storage capacity of plastoquinone (PQ), the frequency of Q_A reduced to Q_A and the absorption energy flux decreased meanwhile the dissipation energy at the level of the antenna chlorophylls increased when K. alvarezii was exposed to salinity of 28, however, the maximal photochemical efficiency of PSⅡ seemed no significantly change and the performance indexes even increased because of number of reversible photochemical regulations such as the increase in the density of reaction center of PSⅡ per excited cross-section of algal sample (RC/CS₀ and RC/CS_m), the energy flux of electrons from Q_A into the electron transport chain per RC(ET₀/RC)and the energy flux per CS (ET₀/CS_m). While seawater salinity dropped to 22, the storage capacity of PQ and the frequency of Q_A reduced to Q_A in K. alvarezii significantly reduced, the electrons transferred to RC of PSⅠ were severely blocked. Therefore, both the light absorbed and trapped as well as the electron transported in K. alvarezii declined, and that the superfluous energy caused a plastic damage to its photosynthetic apparatus. When the salinity further fell to 18, both comprehensive performance indexes and the maximal photochemical efficiency of PSⅡin K. alvarezii distinctly declined due to a rapid decrease in active photosynthetic reaction centers and a heavy interdiction of electron transport flux. Therefore,death of K. alvarezii exposed to such low salinity happened inevitably.
- Kappaphycus alvarezii /
- low-salinity stress /
- primary photochemical reactions

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