The significance of xanthophylls and tocopherols in photo-oxidative stress and photoprotection of three Canarian laurel forest tree species on a high radiation day
Identifieur interne : 000582 ( Main/Exploration ); précédent : 000581; suivant : 000583The significance of xanthophylls and tocopherols in photo-oxidative stress and photoprotection of three Canarian laurel forest tree species on a high radiation day
Auteurs : Agueda Mara Gonzlez-Rodrguez [Autriche, Espagne] ; Michael Tausz [Autriche] ; Astrid Wonisch [Autriche] ; Mara Soledad Jimnez [Espagne] ; Dieter Grill [Autriche] ; Domingo Morales [Espagne]Source :
- Journal of Plant Physiology [ 0176-1617 ] ; 2001.
Abstract
Summary Chloroplast pigments, chlorophyll fluorescence, and tocopherols in sun leaves of the Canarian laurel forest species Myrica faya, Laurus azorica, and Persea indica were characterized during the diurnal course of a high irradiation summer day. All species showed a de-epoxidation of the xanthophyll cycle and a decline of the photochemical efficiency of photosystem II measured as the FvFm fluorescence ratio. Whereas in M. faya, decline and recovery of FvFm was only correlated to zeaxanthin formation, these relations were divergent in L. azorica and P. indica. In P. indica, FvFm did not fully recover until the next morning. Apparently, the decrease of FvFm during the day reflected only a zeaxanthin-dependent, quickly recovering component in M. faya, but an additional component, probably due to photodamage processes requiring repair activities, was observed in L. azorica and P. indica. In leaves of those two species, -tocopherol concentrations varied during the diurnal course, probably indicating active oxygen scavenging action. In P. indica leaves, a degradation and restoration of chlorophyll contents were observed during the day. The conclusion is that M. faya is most resistent to high light stress and P. indica most sensitive, which coincides with known ecological traits of these species.
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DOI: 10.1078/0176-1617-00572
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significance of xanthophylls and tocopherols in photo-oxidative stress and photoprotection of three Canarian laurel forest tree species on a high radiation day</title><author><name sortKey="Gonzlez Rodrguez, Agueda Mara" sort="Gonzlez Rodrguez, Agueda Mara" uniqKey="Gonzlez Rodrguez A" first="Agueda Mara" last="Gonzlez-Rodrguez">Agueda Mara Gonzlez-Rodrguez</name><affiliation wicri:level="1"><country xml:lang="fr">Autriche</country><wicri:regionArea>Departamento de Biologa Vegetal, Universidad de La Laguna, E-38207 La Laguna, Tenerife, SpainInstitut fr Pflanzenphysiologie, Karl-Franzens-Universitt Graz, Schubertstrae 51, A-8010 Graz</wicri:regionArea><wicri:noRegion>A-8010 Graz</wicri:noRegion></affiliation><affiliation wicri:level="1"><country wicri:rule="url">Espagne</country></affiliation></author><author><name sortKey="Tausz, Michael" sort="Tausz, Michael" uniqKey="Tausz M" first="Michael" last="Tausz">Michael Tausz</name><affiliation wicri:level="1"><country 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Tenerife</wicri:regionArea><wicri:noRegion>Tenerife</wicri:noRegion></affiliation></author><author><name sortKey="Grill, Dieter" sort="Grill, Dieter" uniqKey="Grill D" first="Dieter" last="Grill">Dieter Grill</name><affiliation wicri:level="1"><country xml:lang="fr">Autriche</country><wicri:regionArea>Institut fr Pflanzenphysiologie, Karl-Franzens-Universitt Graz, Schubertstrae 51, A-8010 Graz</wicri:regionArea><wicri:noRegion>A-8010 Graz</wicri:noRegion></affiliation></author><author><name sortKey="Morales, Domingo" sort="Morales, Domingo" uniqKey="Morales D" first="Domingo" last="Morales">Domingo Morales</name><affiliation wicri:level="1"><country xml:lang="fr">Espagne</country><wicri:regionArea>Departamento de Biologa Vegetal, Universidad de La Laguna, E-38207 La Laguna, Tenerife</wicri:regionArea><wicri:noRegion>Tenerife</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Plant Physiology</title><title level="j" 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high irradiation summer day. All species showed a de-epoxidation of the xanthophyll cycle and a decline of the photochemical efficiency of photosystem II measured as the FvFm fluorescence ratio. Whereas in M. faya, decline and recovery of FvFm was only correlated to zeaxanthin formation, these relations were divergent in L. azorica and P. indica. In P. indica, FvFm did not fully recover until the next morning. Apparently, the decrease of FvFm during the day reflected only a zeaxanthin-dependent, quickly recovering component in M. faya, but an additional component, probably due to photodamage processes requiring repair activities, was observed in L. azorica and P. indica. In leaves of those two species, -tocopherol concentrations varied during the diurnal course, probably indicating active oxygen scavenging action. In P. indica leaves, a degradation and restoration of chlorophyll contents were observed during the day. The conclusion is that M. faya is most resistent to high light stress and P. indica most sensitive, which coincides with known ecological traits of these species.</div></front></TEI><affiliations><list><country><li>Autriche</li><li>Espagne</li></country></list><tree><country name="Autriche"><noRegion><name sortKey="Gonzlez Rodrguez, Agueda Mara" sort="Gonzlez Rodrguez, Agueda Mara" uniqKey="Gonzlez Rodrguez A" first="Agueda Mara" last="Gonzlez-Rodrguez">Agueda Mara Gonzlez-Rodrguez</name></noRegion><name sortKey="Grill, Dieter" sort="Grill, Dieter" uniqKey="Grill D" first="Dieter" last="Grill">Dieter Grill</name><name sortKey="Tausz, Michael" sort="Tausz, Michael" uniqKey="Tausz M" first="Michael" last="Tausz">Michael Tausz</name><name sortKey="Wonisch, Astrid" sort="Wonisch, Astrid" uniqKey="Wonisch A" first="Astrid" last="Wonisch">Astrid Wonisch</name></country><country name="Espagne"><noRegion><name sortKey="Gonzlez Rodrguez, Agueda Mara" sort="Gonzlez Rodrguez, Agueda Mara" uniqKey="Gonzlez Rodrguez A" first="Agueda Mara" last="Gonzlez-Rodrguez">Agueda Mara Gonzlez-Rodrguez</name></noRegion><name sortKey="Jimnez, Mara Soledad" sort="Jimnez, Mara Soledad" uniqKey="Jimnez M" first="Mara Soledad" last="Jimnez">Mara Soledad Jimnez</name><name sortKey="Morales, Domingo" sort="Morales, Domingo" uniqKey="Morales D" first="Domingo" last="Morales">Domingo Morales</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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