Document Detail


Short- and long-term modulation of the lutein epoxide and violaxanthin cycles in two species of the Lauraceae: sweet bay laurel (Laurus nobilis L.) and avocado (Persea americana Mill.).
MedLine Citation:
PMID:  18426476     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Short- and long-term responses of the violaxanthin (V) and lutein epoxide (Lx) cycles were studied in two species of Lauraceae: sweet bay laurel (Laurus nobilis L.) and avocado (Persea americana L.). The Lx content exceeded the V content in shade leaves of both species. Both Lx and V were de-epoxidised on illumination, but only V was fully restored by epoxidation in low light. Violaxanthin was preferentially de-epoxidised in low light in L. nobilis. This suggests that Lx accumulates with leaf ageing, partly because its conversion to lutein is limited in shade. After exposure to strong light, shade leaves of avocado readjusted the total pools of alpha- and beta-xanthophyll cycles by de novo synthesis of antheraxanthin, zeaxanthin and lutein. This occurred in parallel with a sustained depression of F(v)/F(m). In Persea indica, a closely related but low Lx species, F(v)/F(m) recovered faster after a similar light treatment, suggesting the involvement of the Lx cycle in sustained energy dissipation. Furthermore, the seasonal correlation between non-reversible Lx and V photoconversions and pre-dawn F(v)/F(m) in sun leaves of sweet bay supported the conclusion that the Lx cycle is involved in a slowly reversible downregulation of photosynthesis analogous to the V cycle.
Authors:
R Esteban; M S Jiménez; D Morales; E T Jiménez; K Hormaetxe; J M Becerril; B Osmond; J I García-Plazaola
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Plant biology (Stuttgart, Germany)     Volume:  10     ISSN:  1435-8603     ISO Abbreviation:  Plant Biol (Stuttg)     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-04-22     Completed Date:  2008-08-07     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101148926     Medline TA:  Plant Biol (Stuttg)     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  288-97     Citation Subset:  IM    
Affiliation:
Department of Plant Biology and Ecology, UPV/EHU, Bilbao, Spain.
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MeSH Terms
Descriptor/Qualifier:
Atlantic Islands
Australia
Ecosystem
Kinetics
Laurus / metabolism*
Light
Lutein / analogs & derivatives*,  metabolism
Persea / metabolism*
Plant Leaves / metabolism*
Spain
Time Factors
Xanthophylls / metabolism
Chemical
Reg. No./Substance:
0/Xanthophylls; 126-29-4/violaxanthin; 127-40-2/Lutein

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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