QQ客服 官方微博 反馈留言

	Reduced Calcification Decreases Photoprotective Capability in the Coccolithophorid Emiliania huxleyi
	Xu, Kai ; Gao, Kunshan ; Gao KS(高昆山)
	2012-07
关键词	Calcification Emiliania huxley NPQ Photoprotection Photosynthesis
英文摘要	Intracellular calcification of coccolithophores generates CO2 and consumes additional energy for acquisition of calcium and bicarbonate ions; therefore, it may correlate with photoprotective processes by influencing the energetics. To address this hypothesis, a calcifying Emiliania huxleyi strain (CS-369) was grown semi-continuously at reduced (0.1 mM, LCa) and ambient Ca2+ concentrations (10 mM, HCa) for 150 d (> 200 generations). The HCa-grown cells had higher photosynthetic and calcification rates and higher contents of Chl a and carotenoids compared with the naked (bearing no coccoliths) LCa-grown cells. When exposed to stressfull levels of photosynthetically active radiation (PAR), LCa-grown cells displayed lower photochemical yield and less efficient non-photochemical quenching (NPQ). When the LCa- or HCa-grown cells were inversely shifted to their counterpart medium, LCa to HCa transfer increased photosynthetic carbon fixation (P), calcification rate (C), the C/P ratio, NPQ and pigment contents, whereas those shifted from HCa to LCa exhibited the opposite effects. Increased NPQ, carotenoids and quantum yield were clearly linked with increased or sustained calcification in E. huxleyi. The calcification must have played a role in dissipating excessive energy or as an additional drainage of electrons absorbed by the photosynthetic antennae. This phenomenon was further supported by testing two non-calcifying strains, which showed insignificant changes in photosynthetic carbon fixation and NPQ when transferred to LCa conditions.; National Basic Research Program of China [2009CB421207]; program for Changjiang Scholars and Innovative Research Team [IRT0941]; National Natural Science Foundation [40930846, 41120164007]
语种	英语
出版者	OXFORD UNIV PRESS
内容类型	期刊论文
源URL	[http://dx.doi.org/10.1093/pcp/pcs066]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Xu, Kai,Gao, Kunshan,Gao KS. Reduced Calcification Decreases Photoprotective Capability in the Coccolithophorid Emiliania huxleyi[J],2012.
APA	Xu, Kai,Gao, Kunshan,&高昆山.(2012).Reduced Calcification Decreases Photoprotective Capability in the Coccolithophorid Emiliania huxleyi..
MLA	Xu, Kai,et al."Reduced Calcification Decreases Photoprotective Capability in the Coccolithophorid Emiliania huxleyi".(2012).

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。