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| Combined effects of light intensity and NH^＋4-enrichment on growth,pigmentation, and photosynthetic performance of Ulva prolifera （Chlorophyta） | |
| 引用本文： | 徐智广,吴海一,詹冬梅,孙福新,孙建璋,王广策.Combined effects of light intensity and NH^＋4-enrichment on growth,pigmentation, and photosynthetic performance of Ulva prolifera （Chlorophyta）[J].中国海洋与湖沼学报,2014,32(5):1016-1023. |
| 作者姓名： | 徐智广 吴海一 詹冬梅 孙福新 孙建璋 王广策 |
| 作者单位： | [1]Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China; [2]Marine Biology Institute of Shandong Province, Qingdao 266002, China; [3]Macroalgae Engineering Technology Centre of Qingdao, Qingdao 266002, China; [4]Yutian Group, Wenzhou 325400, China |
| 基金项目： | Supported by the National Natural Science Foundation of China （No. 41376129）, the Public Science and Technology Research Funds Projects of Ocean （Nos. 201305005, 201305021, 201105008-2）, the Natural Science Foundation of Jiangsu Province （No. BK2011400）, and the Strategic Priority Research Program of Chinese Academy of Sciences （No. XDA 11020404-1） |
| 摘 要： | The aim of this study was to investigate the effects of light intensity and enhanced nitrogen supply on the growth and photosynthesis of the green-tide macroalga, Ulva prolifera. Thalli of U. prolifera were grown in natural or NH 4 +-enriched seawater under two different light intensities for 7 days, and then the growth rate, pigmentation, and photosynthetic performance of the thalli were evaluated. The results show that the relative growth rate(RGR) was markedly higher under the high light level than under the low light level. Enrichment with NH 4 + enhanced the RGR under high light intensity, but did not affect RGR under low light intensity. In low light conditions, NH 4 +-enrichment resulted in a marked decrease in the maximal photosynthetic rate( P m) and the maximum carbon fixation rate( V max), but it did not affect the half saturation constant for carbon( K 0.5) or the ratio of V max to K 0.5, which reflects the carbon acquisition efficiency. In high light conditions, P m, K 0.5, and the dark respiration rate( R d) increased under NH 4 + enrichment, but V max and the V max / K 0.5 ratio decreased. Regardless of the light intensity, NH 4 +-enrichment did not affect the apparent photosynthetic efficiency( α), which refl ects the ability of the alga to use light energy at low light levels. Under both low and high light intensities, the chlorophyll a(Chl a), chlorophyll b(Chl b), and carotenoids(Car) contents in thalli were higher in NH 4 +-enriched than in natural seawater, except that there was a decrease in the Chl b content of thalli in NH 4 +-enriched seawater under low light intensity. Therefore, NH 4 + enrichment improved the growth and photosynthetic performance of U. prolifera under high light intensity, but not under low light intensity. We discuss the possible mechanisms underlying these physiological responses. |
| 关 键 词： | 生长速率 光合性能 光照强度 色素沉着 富集 绿藻 石莼 最大光合速率 |
Combined effects of light intensity and NH 4 + -enrichment on growth,pigmentation, and photosynthetic performance of Ulva prolifera (Chlorophyta) |
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| Zhiguang Xu,Haiyi Wu,Dongmei Zhan,Fuxin Sun,Jianzhang Sun,Guangce Wang.Combined effects of light intensity and NH 4 + -enrichment on growth,pigmentation, and photosynthetic performance of Ulva prolifera (Chlorophyta)[J].Chinese Journal of Oceanology and Limnology,2014,32(5):1016-1023. | |
| Authors: | Zhiguang Xu Haiyi Wu Dongmei Zhan Fuxin Sun Jianzhang Sun Guangce Wang |
| Institution: | 1. Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China 2. Marine Biology Institute of Shandong Province, Qingdao, 266002, China 3. Macroalgae Engineering Technology Centre of Qingdao, Qingdao, 266002, China 4. Yutian Group, Wenzhou, 325400, China |
| Abstract: | The aim of this study was to investigate the effects of light intensity and enhanced nitrogen supply on the growth and photosynthesis of the green-tide macroalga, Ulva prolifera. Thalli of U. prolifera were grown in natural or NH 4 + -enriched seawater under two different light intensities for 7 days, and then the growth rate, pigmentation, and photosynthetic performance of the thalli were evaluated. The results show that the relative growth rate (RGR) was markedly higher under the high light level than under the low light level. Enrichment with NH 4 + enhanced the RGR under high light intensity, but did not affect RGR under low light intensity. In low light conditions, NH 4 + -enrichment resulted in a marked decrease in the maximal photosynthetic rate (P m) and the maximum carbon fixation rate (V max), but it did not affect the half saturation constant for carbon (K 0.5) or the ratio of V max to K 0.5, which reflects the carbon acquisition efficiency. In high light conditions, P m, K 0.5, and the dark respiration rate (R d) increased under NH 4 + enrichment, but V max and the V max / K 0.5 ratio decreased. Regardless of the light intensity, NH 4 + -enrichment did not affect the apparent photosynthetic efficiency (α), which reflects the ability of the alga to use light energy at low light levels. Under both low and high light intensities, the chlorophyll a (Chl a), chlorophyll b (Chl b), and carotenoids (Car) contents in thalli were higher in NH 4 + -enriched than in natural seawater, except that there was a decrease in the Chl b content of thalli in NH 4 + -enriched seawater under low light intensity. Therefore, NH 4 + enrichment improved the growth and photosynthetic performance of U. prolifera under high light intensity, but not under low light intensity. We discuss the possible mechanisms underlying these physiological responses. |
| Keywords: | Ulva prolifera low light ammonia enrichment growth rate photosynthesis pigment |
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