The changes of primary photochemical reactions in <em>Kappaphycus alvarezii</em> exposed to low salinity

HUANG Yuan; LIU Jian-guo; PANG Tong; LI Jun; LIN Wei

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HUANG Yuan, LIU Jian-guo, PANG Tong, LI Jun, LIN Wei. The changes of primary photochemical reactions in Kappaphycus alvarezii exposed to low salinity[J]. Haiyang Xuebao, 2010, 32(3): 146-152.

Citation:

HUANG Yuan, LIU Jian-guo, PANG Tong, LI Jun, LIN Wei. The changes of primary photochemical reactions in Kappaphycus alvarezii exposed to low salinity[J]. Haiyang Xuebao, 2010, 32(3): 146-152.

HUANG Yuan, LIU Jian-guo, PANG Tong, LI Jun, LIN Wei. The changes of primary photochemical reactions in Kappaphycus alvarezii exposed to low salinity[J]. Haiyang Xuebao, 2010, 32(3): 146-152.

Citation:

HUANG Yuan, LIU Jian-guo, PANG Tong, LI Jun, LIN Wei. The changes of primary photochemical reactions in Kappaphycus alvarezii exposed to low salinity[J]. Haiyang Xuebao, 2010, 32(3): 146-152.

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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

Received Date: 2009-10-02
Rev Recd Date: 2010-02-02

Abstract

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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References(17)

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