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Relationship between CO(2)-dependent O(2) evolution and photosystem II activity in oak (Quercus petraea) trees grown in the field and in seedlings grown in ambient or elevated CO(2)


, : Relationship between CO(2)-dependent O(2) evolution and photosystem II activity in oak (Quercus petraea) trees grown in the field and in seedlings grown in ambient or elevated CO(2). Tree Physiology 14(7_9): 725-733

The light-response of the apparent quantum yield of photosynthetic O2 evolution under non-photorespiratory conditions was measured together with the photochemical efficiency of PS II, the photochemical efficiency of open PS II reaction centers and the photochemical fluorescence quenching (q(p)) of leaf disks punched from oak leaves of seedlings grown in ambient (350 micromoles mol-1) or elevated (700 micromoles mol-1) CO2 in a greenhouse, and from sunlit leaves of mature oak trees (Quercus petraea (Man.) Liebl.). There were marked differences between seedlings and trees. In seedlings, CO2 concentration during growth did not modify the light response of photosynthesis or PS II activity. There was a single linear relationship between apparent quantum yield of photosynthetic O2 evolution and photochemical efficiency of PS II in seedling leaves that was independent of the CO2 concentration imposed during growth. In contrast, this relationship was curvilinear in sunlit leaves of adult trees. In seedling leaves, the decrease in q(p) (i.e., the proportion of open PS II reaction centers) largely accounted for the decrease in photochemical efficiency of PS II, whereas the decrease in photochemical efficiency of PS II in sunlit leaves of mature oak trees was dependent on both q(p) and the photochemical efficiency of open PS II reaction centers.

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Accession: 002477662

PMID: 14967643

DOI: 10.1093/treephys/14.7-8-9.725

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