二氧化碳加富与阳光紫外辐射对球形棕囊藻的耦合效应

陈善文; 高坤山

二氧化碳加富与阳光紫外辐射对球形棕囊藻的耦合效应

陈善文^1,,
高坤山²

1.
汕头大学海洋生物研究所,广东汕头 515063
2.
厦门大学近海海洋环境科学国家重点实验室,福建厦门 361005

基金项目: 国家自然科学基金项目(40930846);"长江学者和创新团队发展计划"(IRT0941)。

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出版历程
- 收稿日期: 2010-11-18

The coupled effects of carbon dioxide enrichment and ultroviolet radiation on Phaeocystis globosa Scherffel

CHEN Shan-wen^1
,,
GAO Kun-shan²

1.
Marine Biology Institute, Shantou University, Shantou 515063, China
2.
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China

摘要

摘要: 在含有和滤除紫外(UV)辐射(UVR,280~400 nm)的阳光条件下,向静止、恒温的培养体系中分别充含390×10^-6和800×10^-6体积CO₂的空气,以期探讨CO₂浓度升高与阳光UV辐射对球形棕囊藻(Phaeocystis globosa Scherffel)的生理生态学影响。结果显示,该藻对CO₂加富和UVR的响应与细胞密度密切相关。在细胞密度较低时,CO₂加富导致生长和有效光化学效率分别下降了11.0%和10.7%,UVR对两者的抑制率分别达19.2%和41.7%。在细胞密度较高时,CO₂加富和UVR的影响明显减小,UVR的存在甚至导致生长速率的增加。UVR降低了该藻的最大电子传递速率及光能利用效率,在周围空气下分别达14.1%和21.0%,CO₂加富使其进一步下降,分别达8.2%和17.6%。细胞Chl a和Chl c及类胡萝卜素含量在高CO₂条件下显著增加(达4.6%,5.9%和5.2%);UVR导致类胡萝素含量升高(达4.3%)。结果表明,在阳光辐射下,CO₂加富导致球形棕囊藻抵御强光及UVR胁迫能力下降,其对此的生化响应是增加具有保护作用的类胡萝卜素的含量。
- 二氧化碳 /
- 紫外辐射 /
- 生长 /
- 光化效率 /
- 球形棕囊藻
Abstract: CO₂ perturbation experiments were carried out under the solar radiation with or without UV radiation (280~400 nm) in a temperature-controlled water bath to evaluate the coupled effects of CO₂ and UVR on Phaeocystis globosa Scherffel that forms harmful algal blooms. The results show that both of high CO₂ and UVR stress on the algae. The high concentration CO₂ decreases a specific growth rate and the photochemical efficiency of the algae by up to 11.0% and 10.7%, respectively, and the UVR does further them 19.2% and 41.7%. With its cell density increasing, however, their inhibition to the alga was declining, and to minus value. UVR decreases its maximal relative electron transpert rate and photosynthetic efficiency by 14.1% and 21.0%, respectively, in ambient air, and additional 8.2% and 17.6% in the CO₂-enriched. CO₂ enrichment increases chlorophyll a, chlorophyll c and carotenoids by 4.6%,5.9% and 5.2%, respectively. The UVR increases carotenoids by 4.3%. The studies indicate that the high concentration CO₂ aggravates the damage of UVR to the algae, which increaseds in carotenoids as a protective response.
- carbon dioxide /
- growht /
- photochemical efficiency /
- Phaeocystis globosa /
- ultroviolet

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