Co-effects of CO<sub>2</sub> and solar UVR on the growth and photosynthetic performance of the economic red macroalga <em>Porphyra haitanensis</em>

XU Juntian; GAO Kunshan

doi:10.3969/j.issn.0253-4193.2013.05.021

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XU Juntian, GAO Kunshan. Co-effects of CO2 and solar UVR on the growth and photosynthetic performance of the economic red macroalga Porphyra haitanensis[J]. Haiyang Xuebao, 2013, 35(5): 184-190. doi: 10.3969/j.issn.0253-4193.2013.05.021

Citation:

XU Juntian, GAO Kunshan. Co-effects of CO₂ and solar UVR on the growth and photosynthetic performance of the economic red macroalga Porphyra haitanensis[J]. Haiyang Xuebao, 2013, 35(5): 184-190. doi: 10.3969/j.issn.0253-4193.2013.05.021

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Co-effects of CO₂ and solar UVR on the growth and photosynthetic performance of the economic red macroalga Porphyra haitanensis

doi: 10.3969/j.issn.0253-4193.2013.05.021

XU Juntian¹,
GAO Kunshan^2
,

1.
School of Marine Science & Technology, Huaihai Institute of Technology, Lianyungang 222005, China;State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
2.
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

Received Date: 2012-08-07

Abstract

Abstract

Increasing CO₂ in the atmosphere makes the oceans take up more CO₂ from the air, and H⁺ concentration in surface seawater increase, which was known as ocean acidification. In order to find the responses of macroalgae to the environment changes, The economic macroalga Porphyra haitanensis was selected to study the co-effects of solar UVR and CO₂ on the physiological performances of the thalli. The experiments set up two CO₂ levels, 390ppmv and 800ppmv, and three solar light treatments, full spectrum solar radiation (PAB), UV-B was cutting off and PAR only. Our results showed that the enhance of the growth of Porphyra haitanensis was found in the thalli cultured under high CO₂ condition compared with that under ambient CO₂ condition when the UV-B or UVR were cut off, but no significant difference was found in the thalli receiving full solar radiation. UV-B decreased the contents of UV-screening compounds in Porphyra haitanensis grown under elevated CO₂, while UV has no apparent effect on it when the thalli cultured at ambient CO₂ levels. It showed that the advantage of CO₂ in growth of Porphyra haitanensis was offseted by the full spectrum solar radiation, and the production of the economic macroalga might decrease in future ocean where solar UV radiation will futher increase.
- Porphyra haitanensis,
- Solar UV radiation,
- CO₂,
- growth,
- photosynthesis

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