QQ客服 官方微博 反馈留言

	Photosynthetic acclimation to different light levels in the brown marine macroalga, Hizikia fusiformis (Sargassaceae, Phaeophyta)
	Zou, Dinghui（S China Univ Technol, Coll Environm Sci & Engn, Chinese Minist Educ, Key Lab Pollut Control & Ecosyst Restorat Ind Clu, Guangzhou 510006, Guangdong, Peoples R China） ; Gao, Kunshan ; Gao KS(高坤山)
	2010-08
关键词	Hizikia fusiformis Inorganic carbon utilization Photosynthesis Photoacclimation Marine macroalgae
英文摘要	Hizikia fusiformis thalli experience dynamic incident light conditions during the period of growth. The present study was designed to examine how changing photon irradiance affects the photosynthesis both in the short and long terms by culturing H. fusiformis under three different light levels: 35 mu mol photons m(-2) s(-1) (low light, LL), 85 mu mol photons m(-2) s(-1) (intermediate light, IL), and 165 mu mol photons m(-2) s(-1) (high light, HL). A similar relative growth rate was observed between IL- and HL-grown algae, but the growth rate was significantly reduced in LL-grown algae. The photosynthetic rates (P (n)) measured at their respective growth light levels were found to be lowest in the thalli grown at LL and highest at HL. However, LL-grown algae exhibited much higher P (n) in comparison with IL- and the HL-grown thalli at the same measuring photosynthetic photon flux density, indicating the photosynthetic acclimation to low growth light in H. fusiformis. The photosynthesis-light curves showed that LL-grown algae had a highest light-saturating maximum P (n) (P (max)) in comparison with IL- or HL-grown algae when the photosynthetic rates were expressed on the biomass basis. However, P (max) was highest in HL-grown algae compared to IL- or LL-grown algae when the rates were normalized to chlorophyll a. The photosynthesis-inorganic carbon (Ci) response curves were also significantly affected by the growth light conditions. The highest value of apparent photosynthetic conductance occurred in LL-grown algae while the lowest value in HL-grown algae. Additionally, the activity of external carbonic anhydrase (CA) tended to increase while the total CA activity inclined to decrease in H. fusiformis thalli when the growth light level altered from 35 to 165 mu mol photons per square meter per second. The external CA inhibitors showed a higher inhibition in HL-grown algae compared with LL-grown algae. It was proposed that photosynthetic acclimation to low light condition in H. fusiformis was achieved through an increase in the number of reaction centers and increased capacities of electron transport and of Ci transport within cells. The ability of photosynthetic acclimation to low light confers H. fusiformis thalli to overcome the environmental low light condition as a result of the attenuation of seawater or self-shading through enhancing its photosynthetic performance and carbon assimilation necessary for growth.; Chinese 973 Projects [2009CB421207]; National Natural Science Foundation of China [30670396]; Chinese 863 Projects [2006AA10A416]; Guangdong Natural Science Foundation [2007A032600003]
语种	英语
出版者	SPRINGER
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1007/s10811-009-9471-4]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Zou, Dinghui,Gao, Kunshan,Gao KS. Photosynthetic acclimation to different light levels in the brown marine macroalga, Hizikia fusiformis (Sargassaceae, Phaeophyta)[J],2010.
APA	Zou, Dinghui,Gao, Kunshan,&高坤山.(2010).Photosynthetic acclimation to different light levels in the brown marine macroalga, Hizikia fusiformis (Sargassaceae, Phaeophyta)..
MLA	Zou, Dinghui,et al."Photosynthetic acclimation to different light levels in the brown marine macroalga, Hizikia fusiformis (Sargassaceae, Phaeophyta)".(2010).

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。