The influence of carbon dioxide and solar UVR on the growth,photosynthesis and pigments contents of <em>Gracilaria lemaneiformis</em>

XU Jun-tian; GAO Kun-shan

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XU Jun-tian, GAO Kun-shan. The influence of carbon dioxide and solar UVR on the growth,photosynthesis and pigments contents of Gracilaria lemaneiformis[J]. Haiyang Xuebao, 2010, 32(5): 144-151.

Citation:

XU Jun-tian, GAO Kun-shan. The influence of carbon dioxide and solar UVR on the growth,photosynthesis and pigments contents of Gracilaria lemaneiformis[J]. Haiyang Xuebao, 2010, 32(5): 144-151.

XU Jun-tian, GAO Kun-shan. The influence of carbon dioxide and solar UVR on the growth,photosynthesis and pigments contents of Gracilaria lemaneiformis[J]. Haiyang Xuebao, 2010, 32(5): 144-151.

Citation:

XU Jun-tian, GAO Kun-shan. The influence of carbon dioxide and solar UVR on the growth,photosynthesis and pigments contents of Gracilaria lemaneiformis[J]. Haiyang Xuebao, 2010, 32(5): 144-151.

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The influence of carbon dioxide and solar UVR on the growth,photosynthesis and pigments contents of Gracilaria lemaneiformis

XU Jun-tian¹,
GAO Kun-shan²

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: 2010-01-21

Abstract

Abstract

The economic red macroalga Gracilaria lemaneiformis was selected to study the co-effects of CO₂ and solar UVR (280～400 nm) on its growth, photosynthesis, pigments and UVAC contents.Two CO₂ concentration levels (380×10^-6 and 800×10^-6) and three solar radiation treatments (PAB treatment, the thalli receiving full solar radiation; PA treatment, UV-B was cut off, P treatment, all UV radiation were cut off).Results show that the relative growth rate of the thalli increases when the thalli is cultured in high concentration CO₂ condition (800×10^-6) and it decreases in the presence of UVR, but the co-effects of CO₂ and solar UVR are not significant.UVR significantly increase the content of UV-absorbing compounds ofGracilaria lemaneiformis, and further increase of the content of UVACs in PAB treatment is found under CO₂ enriched condition.The positive effects on photosynthesis ofGracilaria lemaneiformis is found in the presence of UV-A when photosynthesis is limited by low PAR.the negative effects are found when the thalli is cultured under CO₂ enriched condition.UVR significantly decreases the photosynthetic rate of theGracilaria lemaneiformis when the thalli is cultured under normal CO₂ level condition, while no effects of UVR is found when the thalli is cultured under CO₂-enriched condition.UVR significantly decreases the content of phycoerythrin, and high concentration CO₂ also decreases the content of phycoerythrin under P and PA treatment, but the opposite result is found in PAB treatment.In conclusion,it is shown thatGracilaria lemaneiformis grown under CO₂-enriched condition can eliminate the deleterious influence of UVR on photosynthesis by increasing UVAC contents and keeping the high content of phycoerythrin in thalli.
- Gracilaria lemaneiformis,
- UV radiation,
- carbon dioxide,
- growth,
- photosynthesis

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References(37)

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