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1
Content available remote Photoprotection by carotenoids of plantago media photosynthetic apparatus in natural conditions
100%
Golovko T. , Dymova O. , Zakhozhiy I. , Dalke I. , Tabalenkova G.
Acta Biochimica Polonica
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2012
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tom 59
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nr 1
145-147
EN
The study of daily changes in photosynthetic rate, of energy used in photochemical and non-photochemical processes, and of carotenoid composition aimed at evaluating the role of xanthophyll cycle (XC) in protection of hoary plantain plants (Plantago media) in nature. The leaves of sun plants differed from shade plants in terms of CO2 exchange rate and photosynthetic pigments content. The total pool XC pigments and the conversion state increased from morning to midday in sun plants. An increase in zeaxanthin content occurred concomitantly with the violaxanthin decrease. About 80% violaxanthin was involved in conversion. The maximum of zeaxanthin in XC pigments pool was 60%. The conversion state of XC was twice as lower in shade plants than that in sun plants. The photosynthesis of sun leaves was depressed strongly at midday, but changes of maximum quantum yield of PS2 (Fv/Fm) were not apparent at that time. The coefficient qN (non-photochemical quenching) in the sun leaves changed strongly, from 0.3 to 0.9 as irradiance increased. The direct relation between heat dissipation and the conversion state of XC in plantain leaves was revealed. Thus, plantain leaves were found to be resistant to excess solar radiation due to activation of qN mechanisms associated with the XC de-epoxidation.
2
Content available Whole-plant acclimation to photooxidative stress: from photoprotection to leaf growth and root architecture
72%
Alter P. , Caliandro R. , Luo F. , Kastenholz B. , Kerstin N. , Matsubara S.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
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2013
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tom 94
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nr 2
3
Content available Ascorbate and photosynthesis: how does Arabidopsis adjust leaf ascorbate concentration to light intensity?
72%
Smirnoff N. , Page M. , Ishikawa T.
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
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2013
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tom 94
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nr 2
4
Content available Distributions of photosynthetic and photoprotecting pigment concentrations in the water column in the Baltic Sea: an improved mathematical description
72%
Ston-Egiert J. , Majchrowski R. , Ostrowska M.
Oceanologia
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2019
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tom 61
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nr 1
5
Molecular view on the carotenogenesis in plants - a mini review
72%
Dobrowolska A.
Polish Journal of Food and Nutrition Sciences
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2006
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tom 15/56
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nr 4
EN
Carotenoids play an integral and essential role in photosynthesis and photoprotection in plants. They are isoprenoid pigments that also function as precursors of the plant growth hormone - abscisic acid (ABA) or components of flavor, colorants and nutraceuticals. Carotenogenesis (carotenoid biosynthesis) and its regulation have been studied in many plant species. The cloning and characterization of plant carotenogenic genes has provided new gene resources and molecular tools which are used to attain a new level of molecular understanding of carotenoid biochemistry and genetics. The knowledge can also be utilized to optimize carotenoids accumulation in crop plant.
PL
Karotenoidy odgrywają zasadniczą rolę w procesach fotosyntezy i fotoprotekcji u roślin. Należą do barwników izoprenoidowych, funkcjonują także jako prekursory kwasu abscysynowego (ABA), roślinnego hormonu wzrostu, czy składniki aromatyczne, barwniki i nutraceutyki. Karotenogeneza (biosynteza karotenoidów) oraz mechanizmy regulacji procesu są przedmiotem badań u wielu gatunków roślin. Klonowanie i charakterystyka roślinnych genów karotenogenezy pozwoliły na rozwój nowych baz informacji genetycznych oraz narzędzi molekularnych, co stwarza możliwości osiągnięcia kolejnego poziomu zrozumienia biochemii, a także genetyki procesu. W przyszłości wiedza ta może zostać wykorzystana w celu optymalizacji akumulacji karotenoidów w roślinach uprawnych.
6
Mg-deficiency in root medium triggers different photoprotective response in young leaves of lettuce than that triggered by the lack of Fe and Mn
58%
Baczek-Kwinta R. , Esteban R. , Garcia-Plazaola J. I. , Czyczylo-Mysza I. , Becerril J. M. , Maslak J.
Acta Physiologiae Plantarum
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2007
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tom 29
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nr 1 Suppl.
7
The xanthophyll cycle - molecular mechanism and physiological significance
58%
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
8
Daily changes in components of xanthophyll cycle and antioxidant systems in leaves of rice at different developing stage
51%
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
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