Linked Life Data

8988608

Source:http://linkedlifedata.com/resource/pubmed/id/8988608

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1997-1-31
pubmed:abstractText
Carotenoids have a key role in photosynthesis in photosynthetic systems, transferring excitation energy to chlorophyll (Chl) during light harvesting. These pigments also protect the photosynthetic apparatus from photodamage by quenching the Chl triplet state and singlet oxygen. In addition, in higher plants and some algae, a number of xanthophylls also have the ability to deactivate excited Chl under conditions of excess excitation via the operation of the xanthophyll cycle (violaxanthin<-->antheraxanthin<-->zeaxanthin or diadinoxanthin<-->diatoxanthin). The formation of zexanthin (or diatoxanthin) can be clearly correlated with the non-photochemical quenching of Chl fluorescence, and is now recognized as a major photoprotective process in higher plants and a number of algal genera. The interconversion of these xanthophylls in response to a changing light environment alters the extent of their carbon-carbon double bond conjugation, which, in turn, affects the excited state energies and lifetimes of the carotenoids and may also alter their structure/conformation and hydrophobicity. The possible roles of these photophysical and physicochemical changes in the mechanism(s) of xanthophyll-mediated energy dissipation via quenching of Chl fluorescence are discussed.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
1011-1344
pubmed:author
pubmed:issnType
Print
pubmed:volume
36
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3-15
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Energy transfer reactions involving carotenoids: quenching of chlorophyll fluorescence.
pubmed:affiliation
School of Biological and Earth Sciences, John Moores University, Liverpool, UK.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Review, Research Support, Non-U.S. Gov't