DOI: 10.1073/pnas.1810886116
论文题名: Photosynthetic adaptation to low iron; light; and temperature in Southern Ocean phytoplankton
作者: Strzepek R.F. ; Boyd P.W. ; Sunda W.G.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2019
卷: 116, 期: 10 起始页码: 4388
结束页码: 4393
语种: 英语
英文关键词: Iron
; Light
; Phytoplankton
; Southern Ocean
; Temperature
Scopus关键词: carbon
; chlorophyll a
; cytochrome b6f
; iron
; algal cell culture
; antenna (organ)
; Article
; biochemical composition
; controlled study
; diatom
; Eucampia antarctica
; growth rate
; Haptophyta
; light adaptation
; light intensity
; light irradiance
; low temperature
; nonhuman
; oxygen evolution
; Phaeocystis antarctica
; photoacclimatization
; photosynthesis
; photosynthetic rate
; photosystem I
; photosystem II
; phytoplankton
; priority journal
; Proboscia inermis
; Southern Ocean
; species comparison
; temperature acclimatization
; Thalassiosira
; Thalassiosira oceanica
; Thalassiosira weissflogii
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 °C) and light intensity (30 vs. 40 μmol 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. © 2019 National Academy of Sciences. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/163582
Appears in Collections: 气候变化与战略
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作者单位: Strzepek, R.F., Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, TAS 7001, Australia; Boyd, P.W., Antarctic Climate and Ecosystems Cooperative Research Centre, University of Tasmania, Hobart, TAS 7001, Australia, Institute for Marine and Antarctic Studies, University of Tasmania, Hobart, TAS 7001, Australia; Sunda, W.G., Department of Marine Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, United States
Recommended Citation:
Strzepek R.F.,Boyd P.W.,Sunda W.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,2019-01-01,116(10)