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dc.contributor.authorWu, Hongyan(Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China)
dc.contributor.authorGao, Kunshan
dc.contributor.author高坤山
dc.date.accessioned2011-05-27T11:29:13Z
dc.date.available2011-05-27T11:29:13Z
dc.date.issued2009
dc.identifier.citationFUNCTIONAL PLANT BIOLOGY,2009,36(2): 137-143zh_CN
dc.identifier.issn1445-4408
dc.identifier.urihttp://dx.doi.org/doi:10.1071/FP08172
dc.identifier.urihttps://dspace.xmu.edu.cn/handle/2288/9198
dc.description.abstractPrevious studies have shown that reduced levels of solar UV radiation (280-400 nm) can enhance photosynthetic carbon fixation of marine phytoplankton, but the mechanisms are not known. The supply of CO2 for photosynthesis is facilitated by extracellular (periplasmic) carbonic anhydrase (CAe) in most marine phytoplankton species. The present study showed that the CAe activity of Skeletonema costatum (Greville) Cleve was stimulated when treated with UV-A (320-395 nm) or UV-A+UV-B (295-320 nm) in addition to visible radiation. The presence of UV-A and UV-B enhanced the activity by 28% and 24%, respectively, at a low irradiance (PAR 161, UV-A 28, UV-B 0.9 Wm(-2)) and by 21% and 19%, respectively, at a high irradiance (PAR 328, UV-A 58, UV- B 1.9 W m(-2)) level after exposure for 1 h. Ultraviolet radiation stimulated CAe activity contributed up to 6% of the photosynthetic carbon fixation as a result of the enhanced supply of CO2, as revealed using the CAe inhibitor (acetazolamide). As a result, there was less inhibition of photosynthetic carbon fixation compared with the apparent quantum yield of PSII. The UV radiation stimulated CAe activity coincided with the enhanced redox activity at the plasma membrane in the presence of UV-A and/or UV- B. The present study showed that UV radiation can enhance CAe activity, which plays an important role in counteracting UV inhibition of photosynthesis.zh_CN
dc.description.sponsorshipNational Natural Science Foundation of China [90411018, 40573059, 40876058]; National Basic Research Program of China [2009CB421207]; Natural Science Foundation of Guangdong Province [5300896]zh_CN
dc.language.isoenzh_CN
dc.publisherCSIRO PUBLISHINGzh_CN
dc.subjectCO2 acquisitionzh_CN
dc.subjectphotoinhibitionzh_CN
dc.subjectphotosynthesiszh_CN
dc.titleUltraviolet radiation stimulated activity of extracellular carbonic anhydrase in the marine diatom Skeletonema costatumzh_CN
dc.typeArticlezh_CN


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