Spirodela polyrhiz (L.) Schleid RESISTANCE TO COLD SHOCK
Effect of short-time (15 sec, 5, 15, 30 min) cold stress (0,1-0,2oC) at 0,1 μmol photons м-2 s-1 over the Spirodela polyrhiza (L.) Schleid carotenoid composition cultivated under the laboratory conditions has been studied. It is found that the sum of carotenoid pigments of Spirodela polyrhiza (L.) d...
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| creator | Sofronova, V E Chepalov, V A Petrov, K A |
| description | Effect of short-time (15 sec, 5, 15, 30 min) cold stress (0,1-0,2oC) at 0,1 μmol photons м-2 s-1 over the Spirodela polyrhiza (L.) Schleid carotenoid composition cultivated under the laboratory conditions has been studied. It is found that the sum of carotenoid pigments of Spirodela polyrhiza (L.) does not change and averages 206,9 ± 11,5 mkg/g in fresh weight. Pool increase of lutein+zeaxanthin (by 5-8%) has been observed in response to a short-time Spirodela polyrhiza cooling with simultaneous decrease of violaxanthin content (by 16%). Violaxanthin de-epoxidation occurs in the minute time spans and the depth of conversion does not depend on the cold shock duration. The data obtained indicate that pigments of the violaxanthin cycle may participate in realization of transitory emergency protection systems of photosynthetic apparatus by increasing the share of thermal energy dissipation of the absorbed light and preventing singlet oxygen formation. |
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Violaxanthin de-epoxidation occurs in the minute time spans and the depth of conversion does not depend on the cold shock duration. The data obtained indicate that pigments of the violaxanthin cycle may participate in realization of transitory emergency protection systems of photosynthetic apparatus by increasing the share of thermal energy dissipation of the absorbed light and preventing singlet oxygen formation.</description><identifier>EISSN: 1997-0838</identifier><language>eng ; rus</language><publisher>Irkutsk: Russian Academy of Sciences, Siberian Branch</publisher><subject>Carotenoids ; Cold shock ; Epoxidation ; Photons ; Photosynthetic apparatus ; Pigments ; Spirodela polyrhiza ; Violaxanthin ; Zeaxanthin</subject><ispartof>Journal of stress physiology & biochemistry, 2006-01, Vol.2 (1), p.16</ispartof><rights>2006. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). 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It is found that the sum of carotenoid pigments of Spirodela polyrhiza (L.) does not change and averages 206,9 ± 11,5 mkg/g in fresh weight. Pool increase of lutein+zeaxanthin (by 5-8%) has been observed in response to a short-time Spirodela polyrhiza cooling with simultaneous decrease of violaxanthin content (by 16%). Violaxanthin de-epoxidation occurs in the minute time spans and the depth of conversion does not depend on the cold shock duration. The data obtained indicate that pigments of the violaxanthin cycle may participate in realization of transitory emergency protection systems of photosynthetic apparatus by increasing the share of thermal energy dissipation of the absorbed light and preventing singlet oxygen formation.</description><subject>Carotenoids</subject><subject>Cold shock</subject><subject>Epoxidation</subject><subject>Photons</subject><subject>Photosynthetic apparatus</subject><subject>Pigments</subject><subject>Spirodela polyrhiza</subject><subject>Violaxanthin</subject><subject>Zeaxanthin</subject><issn>1997-0838</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><sourceid>ABUWG</sourceid><sourceid>AFKRA</sourceid><sourceid>AZQEC</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><sourceid>GNUQQ</sourceid><recordid>eNpjYuA0tLQ01zWwMLbgYOAtLs4yAAILQ1NDA2NOBovggsyi_JTUnESFgvycyqKMzCoFDR89TYXg5Iyc1MwUhSDXYM_gEEc_Z1eFEH8FZ38fF4VgD39nbx4G1rTEnOJUXijNzaDs5hri7KFbUJRfWJpaXBKflV9alAeUijcyNjQwNLUwtzAyJk4VAOlKMsg</recordid><startdate>20060101</startdate><enddate>20060101</enddate><creator>Sofronova, V E</creator><creator>Chepalov, V A</creator><creator>Petrov, K A</creator><general>Russian Academy of Sciences, Siberian Branch</general><scope>3V.</scope><scope>7X7</scope><scope>7XB</scope><scope>8FE</scope><scope>8FH</scope><scope>8FI</scope><scope>8FJ</scope><scope>8FK</scope><scope>ABUWG</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BBNVY</scope><scope>BENPR</scope><scope>BHPHI</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>FYUFA</scope><scope>GHDGH</scope><scope>GNUQQ</scope><scope>HCIFZ</scope><scope>K9.</scope><scope>LK8</scope><scope>M0S</scope><scope>M7P</scope><scope>PIMPY</scope><scope>PQEST</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PRINS</scope></search><sort><creationdate>20060101</creationdate><title>Spirodela polyrhiz (L.) 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| ispartof | Journal of stress physiology & biochemistry, 2006-01, Vol.2 (1), p.16 |
| issn | 1997-0838 |
| language | eng ; rus |
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| source | DOAJ Directory of Open Access Journals; EZB-FREE-00999 freely available EZB journals; Free Full-Text Journals in Chemistry |
| subjects | Carotenoids Cold shock Epoxidation Photons Photosynthetic apparatus Pigments Spirodela polyrhiza Violaxanthin Zeaxanthin |
| title | Spirodela polyrhiz (L.) Schleid RESISTANCE TO COLD SHOCK |
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