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DOI | 10.1073/pnas.1810886116 |
Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton | |
Strzepek, Robert F.1; Boyd, Philip W.1,2; Sunda, William G.3 | |
2019 | |
发表期刊 | PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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ISSN | 0027-8424 |
出版年 | 2019 |
卷号 | 116期号:10页码:4388-4393 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; USA |
英文摘要 | Phytoplankton productivity in the polar Southern Ocean (SO) plays an important role in the transfer of carbon from the atmosphere to the ocean's interior, a process called the biological carbon pump, which helps regulate global climate. SO productivity in turn is limited by low iron, light, and temperature, which restrict the efficiency of the carbon pump. Iron and light can colimit productivity due to the high iron content of the photosynthetic photosystems and the need for increased photosystems for low-light acclimation in many phytoplankton. Here we show that SO phytoplankton have evolved critical adaptations to enhance photosynthetic rates under the joint constraints of low iron, light, and temperature. Under growth-limiting iron and light levels, three SO species had up to sixfold higher photosynthetic rates per photosystem II and similar or higher rates per mol of photosynthetic iron than temperate species, despite their lower growth temperature (3 vs. 18 degrees C) and light intensity (30 vs. 40 mu mol quanta.m(2).s(-1)), which should have decreased photosynthetic rates. These unexpectedly high rates in the SO species are partly explained by their unusually large photosynthetic antennae, which are among the largest ever recorded in marine phytoplankton. Large antennae are disadvantageous at low light intensities because they increase excitation energy loss as heat, but this loss may be mitigated by the low SO temperatures. Such adaptations point to higher SO production rates than environmental conditions should otherwise permit, with implications for regional ecology and biogeochemistry. |
英文关键词 | iron light temperature Southern Ocean phytoplankton |
领域 | 地球科学 ; 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000460242100069 |
WOS关键词 | PHYSIOLOGICAL-RESPONSES ; ELECTRON-TRANSPORT ; PHOTOSYSTEM-II ; QUANTUM YIELD ; LIMITATION ; GROWTH ; STRATEGIES ; PHOTOPHYSIOLOGY ; ASSIMILATION ; COASTAL |
WOS类目 | Multidisciplinary Sciences |
WOS研究方向 | Science & Technology - Other Topics |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/205063 |
专题 | 地球科学 资源环境科学 气候变化 |
作者单位 | 1.Univ Tasmania, Antarctic Climate & Ecosyst Cooperat Res Ctr, Hobart, Tas 7001, Australia; 2.Univ Tasmania, Inst Marine & Antarctic Studies, Hobart, Tas 7001, Australia; 3.Univ N Carolina, Dept Marine Sci, Chapel Hill, NC 27599 USA |
推荐引用方式 GB/T 7714 | Strzepek, Robert F.,Boyd, Philip W.,Sunda, William G.. Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2019,116(10):4388-4393. |
APA | Strzepek, Robert F.,Boyd, Philip W.,&Sunda, William G..(2019).Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,116(10),4388-4393. |
MLA | Strzepek, Robert F.,et al."Photosynthetic adaptation to low iron, light, and temperature in Southern Ocean phytoplankton".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 116.10(2019):4388-4393. |
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