QQ客服 官方微博 反馈留言

	Effects of elevated CO2 on the red seaweed Gracilaria lemaneiformis (Gigartinales, Rhodophyta) grown at different irradiance levels
	Zou, Dinghui（S China Univ Technol, Coll Environm Sci & Engn, Guangzhou 510640, Peoples R China） ; Gao, Kunshan ; Gao KS(高坤山)
	2009-11
关键词	CO2 Gracilaria lemaneiformis Growth Irradiance Photosynthesis Seaweeds
英文摘要	The red seaweed Gracilaria lenzaneiformis (Bory) Weber-van Bosse (Gigartinales, Rhodophyta) from Nanao Island, Shantou, China, was cultured at 370 and 700 mu l l(-1) CO2 in aeration and at intermediate (160 mu mol photons m(-2) s(-1)) and low (30 mu mol photons m(-2) s(-1)) irradiance levels in order to examine the influences of the elevated atmospheric CO2 concentrations on growth, photosynthetic performance and some biochemical components in this commercially important species. Relative growth rate (RGR) was significantly higher in G. lemaneiformis thalli grown using CO2-enriched air with respect to nonenriched air when the algae were subjected to intermediate irradiance. However, RGR was similar between these two CO2 treatments when the algae were grown under the low-irradiance condition. Extra CO, in the culture decreased phycobiliprotein (PB, including phycoerythrin, PE, and phycocyanin, PC) contents of G. lemaneiformis thalli at the higher growth irradiance. However, chlorophyll a (Chl a) and soluble protein contents were unchanged by the CO2 levels in culture. Both PB and Chl a contents were higher in G. lemaneiformis thalli grown at the lower irradiance than at the higher irradiance, regardless of the CO2 levels in culture. The parameters for photosynthetic responses to irradiance and inorganic carbon were mostly not altered with the increase Of CO2 concentrations in culture. However, light-saturated photosynthetic rates (P-max) and apparent carboxylating efficiencies (ACE), expressed per unit Chl a, were significantly higher in algae grown at the intermediate irradiance compared to the low irradiance. Photosynthetic rate was reduced by an increase in pH of seawater from 8.2 to 9.1, and it was also strongly inhibited by the external carbonic anhydrase inhibitor acetazolamide (AZ) in G. lemaneiformis thalli grown at each CO2 and irradiance condition. Moreover, pH compensation points were not affected by the growth conditions. These results suggested that G. lemaneiformis under both growth conditions had a similar capacity of the photosynthetic utilization of external HCO3- pool in seawater. However, ACE decreased in G. lemaneiformis thalli grown at the low irradiance with respect to the higher irradiance implied that the transport of Ci towards Rubisco within the cell was weakened. Taken together, the data showed that an increase of CO2 was less effective on G. lemaneiformis than the irradiance levels. We concluded that CO2 affected photosynthesis and growth performance when light was not the limiting factor.; National Natural Science Foundation of China [30670396, 90411018]; Chinese Ministry of Education [207080]; Chinese 973 Project [2009CB21207]; Guangdong Natural Science Foundation [2006B20601005, 2007A02600003]
语种	英语
出版者	INT PHYCOLOGICAL SOC
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.2216/08-99.1]
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. Effects of elevated CO2 on the red seaweed Gracilaria lemaneiformis (Gigartinales, Rhodophyta) grown at different irradiance levels[J],2009.
APA	Zou, Dinghui,Gao, Kunshan,&高坤山.(2009).Effects of elevated CO2 on the red seaweed Gracilaria lemaneiformis (Gigartinales, Rhodophyta) grown at different irradiance levels..
MLA	Zou, Dinghui,et al."Effects of elevated CO2 on the red seaweed Gracilaria lemaneiformis (Gigartinales, Rhodophyta) grown at different irradiance levels".(2009).

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。