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	Photorespiration and CO2 fixation in the red alga Porphyra yezoensis Ueda
	Gao, K. S. ; Aruga, Y. ; Asada, K. ; Ishihara, T. ; Akano, T. ; Kiyohara, M. ; Gao KS(高坤山)
	1992
英文摘要	Gas exchange in photosynthesis of the red alga Porphyra yezoensis was investigated to understand its growth enhancement in high CO-2 concentration. It was found that oxygen (18O-2) uptake by the alga increased linearly with increased photosynthetically active radiation, being about 40% of photosynthetic oxygen evolution at 250 mu-mol photons m-1 s-1. A substantive evidence for active HCO-3- transport by the alga was obtained in that CO-2 uptake rate was extremely slow compared to the photosynthetic oxygen evolution rate. In the culture of the alga using aeration, dissolved inorganic carbon (DIC) concentration decreased while pH increased from the beginning of light period and increased while pH decreased from the start of dark period. This is because photosynthetic CO-2 fixation proceeded faster than the dissolution of CO-2 and thus DIC was reduced due to photosynthetic HCO-3- utilization in the light, and in the dark the cease of photosynthesis and continuation of aeration increased DIC and lowered pH. Addition of CO-2 (air+1250 ppm CO-2) in the culture of the alga was confirmed to raise DIC concentration. It was suggested that addition of CO-2 could suppress the photorespiration of P. yezoensis by elevating CO-2/O-2 ratio in the culture medium and then at the active site of Rubisco, the oxygenation of which could be subsequently reduced.
语种	英语
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/60899]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Gao, K. S.,Aruga, Y.,Asada, K.,et al. Photorespiration and CO2 fixation in the red alga Porphyra yezoensis Ueda[J],1992.
APA	Gao, K. S..,Aruga, Y..,Asada, K..,Ishihara, T..,Akano, T..,...&高坤山.(1992).Photorespiration and CO2 fixation in the red alga Porphyra yezoensis Ueda..
MLA	Gao, K. S.,et al."Photorespiration and CO2 fixation in the red alga Porphyra yezoensis Ueda".(1992).

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