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Determination of epoxides in Escherichia coli expressing recombinant zeaxanthin epoxidase

100%

Kuczynska P., Leskiewicz S., Strzalka W., Olchawa-Pajor M., Bojko M., Latowski D., Strzalka K.

BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology

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2013

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tom 94

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nr 3

2

The role of non bilayer-forming lipids in molecular mechanism of violaxanthin de-epoxidation

100%

Latowski D., Akerlund H. E., Strzalka K.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

3

Isomerization of violaxanthin in the antenna complexes LHCII and in solution

100%

Niedzwiedzki D., Grudzinski W., Krupa Z., Gruszecki W. I.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

4

Effect of soil salinity and water deficit on the violaxanthin pigments contents and nonphotochemical quenching of fluorescence in leaves of spring wheat

84%

Shadchina T. M., Pryadkina G. O.

Acta Physiologiae Plantarum

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2007

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tom 29

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nr 1 Suppl.

5

Effect of carotenoides on oxygen transport within and across model membranes

84%

Subczynski W. K., Markowska E.

Current Topics in Biophysics

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1992

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tom 16

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nr 2

6

Adaptation of the photosynthetic apparatus of Nitellopsis obtusa to changing light intensity at the molecular level: different pathways of a singlet excitation quenching

67%

Gruszecki W. I., Gospodarek M., Jaskowska A., Spiewla E.

Acta Physiologiae Plantarum

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2006

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tom 28

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nr 2

The effect of pro longed illumination (60 min) with photosynthetically active monochromatic radiation of low intensity (3 μmol-m⁻² ·s⁻¹) and high intensity (60 mmol m⁻² ·s⁻¹), corresponding to the physiological conditions and light stress conditions, respectively, was studied in the algae Nitellopsis obtusa. Illumination of Nitellopsis obtusa cells with strong light was associated with activation of the xanthophyll cycle, manifested by the deepoxidation of violaxanthin and accumulation of antheraxanthin and zeaxanthin. At the same time, the efficient singlet excitation quenching in the photosynthetic apparatus was activated, as demonstrated by the decrease in the intensity of the chlorophyll a fluorescence emission by ca 50 %. The difference of the fluorescence excitation spectra recorded before and after the light treatment match the difference absorption spectrum of the xanthophyll cycle pigments. The illumination with low light intensity resulted also in the chlorophyll a fluorescence quenching but the effect was very small (less than 10 %). The fluorescence quenching is interpreted in terms of the energy transfer between the Qy energy level of chlorophyll a and the 2¹Ag⁻ energy level of zeaxanthin. The singlet energy levels of carotenoids, corresponding to the green spectral region, are also taken into consideration in the interpretation of the excitation energy exchange between the carotenoids and chlorophylls. Possible molecular mechanisms involved in the activation of the strong and the weak excitation quenching, including violaxanthin isomerization, and possible physiological functions of such pathways of energy transfer are discussed.

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Photo-oxidation of chlorophyll A in digalactosyldiacylglycerol liposomes containing xanthophyll pigments: indication of a special photoprotective ability of zeaxanthin

67%

Sielewiesiuk J., Matula M., Gruszecki W. I.

Cellular and Molecular Biology Letters

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1997

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tom 02

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nr 1

Photoprotective efficiency of lutein, zeaxanthin and violaxanthin in liposomes made of digalactosyldiacylglycerol (DGDG) has been investigated. It was found that zeaxanthin is about ten times more effective than the two other xanthophylls in inhibition of chlorophyll a photo-oxidation. Kinetics of chlorophyll photobleaching suggests that exceptional photoprotective efficacy of zeaxanthin in membranes consists in effective scavenging of free radicals. High photoprotective efficiency of zeaxanthin in membranes correlates with its physiological function.

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The xanthophyll cycle - molecular mechanism and physiological significance

67%

Latowski D., Grzyb J., Strzalka K.

Acta Physiologiae Plantarum

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2004

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tom 26

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nr 2

9

Content of carotenoids in needles of Pinus sylvestris L. growing in a polluted area

67%

Matysiak R.

Dendrobiology

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2001

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tom 46

Carotenoids (neoxanthin, violaxanthin, lutein and β-carotene) present in plant cell play a role in photoprotection. Industrial pollution causes oxidative stress in plants, while carotenoids react with free radicals and dissipate the excess of excitation energy. In this way carotenoids prevent the negative influence of free radicals on metabolism and can even restore some of the damages. This is confirmed by results of our analysis of the level of xanthophylls in 16 and 17-year-old trees of Scots pine (Pinus sylvestris L.). Developed from seed collected in north-eastern, the trees grow in a relatively unpolluted control site, and in a polluted site located 2 km for away from the Phosphorus Fertilizer Works. In the polluted site the environment is contaminated with SO2, NOx and F, Al, F, Pb, Cu. The needles analysed in this study were visually undamaged. Material was collected in experimental plot from 6 trees in October'98 and April'99, between 12.00 and 13.00 hours, at full sunlight. The pigments were analysed quantitatively and qualitatively by thin-layer chromatography. The paper presents results of content and distribution of neoxanthin, violaxanthin, lutein and β-carotene of Scots pine needles from a healthy control tree and a stressed tree. Marked differences in pigment levels depended on the stage of needle development and level of pollution.

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Daily changes in components of xanthophyll cycle and antioxidant systems in leaves of rice at different developing stage

59%

Yang C. W., Chen Y. Z., Peng C. L., Jun D., Lin G. Z.

Acta Physiologiae Plantarum

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2001

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tom 23

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nr 4

Ograniczanie wyników

Determination of epoxides in Escherichia coli expressing recombinant zeaxanthin epoxidase

The role of non bilayer-forming lipids in molecular mechanism of violaxanthin de-epoxidation

Isomerization of violaxanthin in the antenna complexes LHCII and in solution

Effect of soil salinity and water deficit on the violaxanthin pigments contents and nonphotochemical quenching of fluorescence in leaves of spring wheat

Effect of carotenoides on oxygen transport within and across model membranes

Adaptation of the photosynthetic apparatus of Nitellopsis obtusa to changing light intensity at the molecular level: different pathways of a singlet excitation quenching

Photo-oxidation of chlorophyll A in digalactosyldiacylglycerol liposomes containing xanthophyll pigments: indication of a special photoprotective ability of zeaxanthin

The xanthophyll cycle - molecular mechanism and physiological significance

Content of carotenoids in needles of Pinus sylvestris L. growing in a polluted area

Daily changes in components of xanthophyll cycle and antioxidant systems in leaves of rice at different developing stage