气候变化领域集成服务门户(CCPortal): Modeling Photoprotection at Global Scale: The Relative Role of Nonphotosynthetic Pigments, Physiological State, and Species Composition

CCPortal

DOI	10.1029/2018GB006101
	Modeling Photoprotection at Global Scale: The Relative Role of Nonphotosynthetic Pigments, Physiological State, and Species Composition
	Álvarez E.; Thoms S.; Bracher A.; Liu Y.; Völker C.
发表日期	2019
ISSN	0886-6236
EISSN	1944-9224
起始页码	904
结束页码	926
卷号	33 期号:7
英文摘要	Microalgae are capable of acclimating to dynamic light environments, as they have developed mechanisms to optimize light harvesting and photosynthetic electron transport. When absorption of light exceeds photosynthetic capacity, various physiological protective mechanisms prevent damage of the photosynthetic apparatus. Xanthophyll pigments provide one of the most important photoprotective mechanisms to dissipate the excess light energy and prevent photoinhibition. In this study, we coupled a mechanistic model for phytoplankton photoinhibition with the global biogeochemical model Regulated Ecosystem Model version 2. The assumption that photoinhibition is small in phytoplankton communities acclimated to ambient light allowed us to predict the photoprotective needs of phytoplankton. When comparing the predicted photoprotective needs to observations of pigment content determined by high-performance liquid chromatography, our results showed that photoprotective response seems to be mediated in most parts of the ocean by a variable ratio of xanthophyll pigments to chlorophyll. The variability in the ratio appeared to be mainly driven by changes in phytoplankton community composition. Exceptions appeared at high latitudes where other energy dissipating mechanisms seem to play a role in photoprotection and both taxonomic changes and physiological acclimation determine community pigment signature. Understanding the variability of community pigment signature is crucial for modeling the coupling of light absorption to carbon fixation in the ocean. Insights about how much of this variability is attributable to changes in community composition may allow us to improve the match between remotely sensed optical data and the underlying phytoplankton community. ©2019. American Geophysical Union. All Rights Reserved.
英文关键词	carotenoids; model; photoacclimation; photoinhibition; photoprotection; PPC
语种	英语
scopus关键词	acclimation; carbon fixation; carotenoid; community composition; ecosystem modeling; inhibition; light effect; photochemistry; photoinhibition; photoprotection; physiological response; pigment
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129756
作者单位	Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Bremerhaven, Germany; Institute of Environmental Physics, University of Bremen, Bremen, Germany; Faculty of Biology and Chemistry, University of Bremen, Bremen, Germany
推荐引用方式 GB/T 7714	Álvarez E.,Thoms S.,Bracher A.,et al. Modeling Photoprotection at Global Scale: The Relative Role of Nonphotosynthetic Pigments, Physiological State, and Species Composition[J],2019,33(7).
APA	Álvarez E.,Thoms S.,Bracher A.,Liu Y.,&Völker C..(2019).Modeling Photoprotection at Global Scale: The Relative Role of Nonphotosynthetic Pigments, Physiological State, and Species Composition.Global Biogeochemical Cycles,33(7).
MLA	Álvarez E.,et al."Modeling Photoprotection at Global Scale: The Relative Role of Nonphotosynthetic Pigments, Physiological State, and Species Composition".Global Biogeochemical Cycles 33.7(2019).