Document Detail


Evolved physiological responses of phytoplankton to their integrated growth environment.
MedLine Citation:
PMID:  18487129     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Phytoplankton growth and productivity relies on light, multiple nutrients and temperature. These combined factors constitute the 'integrated growth environment'. Since their emergence in the Archaean ocean, phytoplankton have experienced dramatic shifts in their integrated growth environment and, in response, evolved diverse mechanisms to maximize growth by optimizing the allocation of photosynthetic resources (ATP and NADPH) among all cellular processes. Consequently, co-limitation has become an omnipresent condition in the global ocean. Here we focus on evolved phytoplankton populations of the contemporary ocean and the varied energetic pathways they employ to solve the optimization problem of resource supply and demand. Central to this discussion is the allocation of reductant formed through photosynthesis, which we propose has the following three primary fates: carbon fixation, direct use and ATP generation. Investment of reductant among these three sinks is tied to cell cycle events, differentially influenced by specific forms of nutrient stress, and a strong determinant of relationships between light-harvesting (pigment), photosynthetic electron transport and carbon fixation. Global implications of optimization are illustrated by deconvolving trends in the 10-year global satellite chlorophyll record into contributions from biomass and physiology, thereby providing a unique perspective on the dynamic nature of surface phytoplankton populations and their link to climate.
Authors:
Michael J Behrenfeld; Kimberly H Halsey; Allen J Milligan
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Philosophical transactions of the Royal Society of London. Series B, Biological sciences     Volume:  363     ISSN:  0962-8436     ISO Abbreviation:  Philos. Trans. R. Soc. Lond., B, Biol. Sci.     Publication Date:  2008 Aug 
Date Detail:
Created Date:  2008-07-14     Completed Date:  2008-09-30     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  7503623     Medline TA:  Philos Trans R Soc Lond B Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  2687-703     Citation Subset:  IM    
Affiliation:
Department of Botany and Plant Pathology, Oregon State University, Corvallis, OR 97331-2902, USA. mjb@science.oregonstate.edu <mjb@science.oregonstate.edu>
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MeSH Terms
Descriptor/Qualifier:
Adenosine Triphosphate / biosynthesis
Amino Acids / biosynthesis
Biological Evolution*
Carbohydrates / biosynthesis
Climate
Ecosystem
Light
Models, Biological
Oceans and Seas
Photosynthesis
Phytoplankton / growth & development*,  physiology*
Time Factors
Chemical
Reg. No./Substance:
0/Amino Acids; 0/Carbohydrates; 56-65-5/Adenosine Triphosphate
Comments/Corrections

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