Document Detail


Regulation of the photosynthetic apparatus under fluctuating growth light.
MedLine Citation:
PMID:  23148275     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Safe and efficient conversion of solar energy to metabolic energy by plants is based on tightly inter-regulated transfer of excitation energy, electrons and protons in the photosynthetic machinery according to the availability of light energy, as well as the needs and restrictions of metabolism itself. Plants have mechanisms to enhance the capture of energy when light is limited for growth and development. Also, when energy is in excess, the photosynthetic machinery slows down the electron transfer reactions in order to prevent the production of reactive oxygen species and the consequent damage of the photosynthetic machinery. In this opinion paper, we present a partially hypothetical scheme describing how the photosynthetic machinery controls the flow of energy and electrons in order to enable the maintenance of photosynthetic activity in nature under continual fluctuations in white light intensity. We discuss the roles of light-harvesting II protein phosphorylation, thermal dissipation of excess energy and the control of electron transfer by cytochrome b(6)f, and the role of dynamically regulated turnover of photosystem II in the maintenance of the photosynthetic machinery. We present a new hypothesis suggesting that most of the regulation in the thylakoid membrane occurs in order to prevent oxidative damage of photosystem I.
Authors:
Mikko Tikkanen; Michele Grieco; Markus Nurmi; Marjaana Rantala; Marjaana Suorsa; Eva-Mari Aro
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Review    
Journal Detail:
Title:  Philosophical transactions of the Royal Society of London. Series B, Biological sciences     Volume:  367     ISSN:  1471-2970     ISO Abbreviation:  Philos. Trans. R. Soc. Lond., B, Biol. Sci.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-11-13     Completed Date:  2013-04-22     Revised Date:  2014-01-10    
Medline Journal Info:
Nlm Unique ID:  7503623     Medline TA:  Philos Trans R Soc Lond B Biol Sci     Country:  England    
Other Details:
Languages:  eng     Pagination:  3486-93     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Cytochrome b6f Complex / metabolism
Electron Transport
Energy Transfer
Light-Harvesting Protein Complexes / metabolism*
Oxidation-Reduction
Phosphorylation
Photosynthesis*
Photosystem I Protein Complex / metabolism
Photosystem II Protein Complex / metabolism
Plants / metabolism*,  radiation effects
Sunlight*
Thylakoids / metabolism*
Chemical
Reg. No./Substance:
0/Light-Harvesting Protein Complexes; 0/Photosystem I Protein Complex; 0/Photosystem II Protein Complex; 9035-40-9/Cytochrome b6f Complex
Comments/Corrections

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