Seasonal changes of violaxanthin cycle pigment de-epoxidation in wintergreen and evergreen plants.
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چکیده
منابع مشابه
Seasonal changes of violaxanthin cycle pigment de-epoxidation in wintergreen and evergreen plants.
We studied carotenoids composition and the activities of the xanthophylls pigments in evergreen conifers (Abies sibirica, Juniperus communis, Picea obovata) and dwarf-shrub (Vaccinium vitis-idaea), and in wintergreen herbaceous plants (Ajuga reptans, Pyrola rotundifolia) growing near Syktyvkar (61°67(/) N 50°77(/) E). The carotenoid pool consisted mainly of following xanthophylls: lutein (70%),...
متن کاملViolaxanthin and diadinoxanthin de-epoxidation in various model lipid systems.
The xanthophyll cycle is an important photoprotective process functioning in plants. One of its forms, the violaxanthin (Vx) cycle, involves interconversion between: Vx, antheraxanthin (Ax) and zeaxanthin (Zx). Another kind of the xanthophyll cycle is the diadinoxanthin (Ddx) cycle in which interconversion between Ddx and diatoxanthin (Dtx) occurs. In this study an information on molecular mech...
متن کاملBiochemistry of Tue Violaxanthin Cycle in Higher Plants
The biochemistry of the violaxanthin cycle in relationship to photosynthesis is reviewed. The cycle is a component of the thylakoid and consists of a reaction sequence in which violaxanthin is converted to zeaxanthin (de—epoxidation) and then regenerated (epoxidation) through separate reaction mechanisms. The arrangement of the cycle in the thyla— koid is transmembranous with the de—epoxidation...
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The conversion of violaxanthin to zeaxanthin is essentially required for the pH-regulated dissipation of excess light energy in the antenna of photosystem II. Violaxanthin is bound to each of the antenna proteins of both photosystems. Former studies with recombinant Lhcb1 and different Lhca proteins implied that each antenna protein contributes specifically to violaxanthin conversion related to...
متن کاملEffect of monogalactosyldiacylglycerol and other thylakoid lipids on violaxanthin de-epoxidation in liposomes.
In this study we present evidence that one of two reactions of the xanthophyll cycle, violaxanthin de-epoxidation, may occur in unilamellar egg phosphatidylcholine vesicles supplemented with monogalactosyldiacylglycerol (MGDG). Activity of violaxanthin de-epoxidase (VDE) in this system was found to be strongly dependent on the content of MGDG in the membrane; however, only to a level of 30 mol%...
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ژورنال
عنوان ژورنال: Acta Biochimica Polonica
سال: 2012
ISSN: 1734-154X,0001-527X
DOI: 10.18388/abp.2012_2191