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- W2330990906 endingPage "814" @default.
- W2330990906 startingPage "807" @default.
- W2330990906 abstract "Four clones of Sitka spruce (Picea sitchensis (Bong.) Carr.) from two provenances, at 53.2° N (Skidegate a and Skidegate b) and at 41.3° N (North Bend a and North Bend b), were grown for three growing seasons in ambient (∼∼350 μmol mol−1) and elevated (∼700 μmol mol−1) CO2 concentrations. The clones were grown in stress-free conditions (adequate nutrition and water) to assess the effect of elevated [CO2] on tree physiology. Growth in elevated [CO2] significantly increased instantaneous photosynthetic rates of the clonal Sitka spruce saplings by about 62%. Downward acclimation of photosynthesis (A) was found in all four clones grown in elevated [CO2]. Rubisco activity and total chlorophyll concentration were also significantly reduced in elevated [CO2]. Provenance did not influence photosynthetic capacity. Best-fit estimates of Jmax (maximum rate of electron transport), Vcmax (RuBP-saturated rate of Rubisco) and Amax (maximum rate of assimilation) were derived from responses of A to intercellular [CO2] by using the model of Farquhar et al. (1980). At any leaf N concentration, the photosynthetic parameters were reduced by growth in elevated [CO2]. However, the ratio between Jmax and Vcmax was unaffected by CO2 growth concentration, indicating a tight coordination in the allocation of N between thylakoid and soluble proteins. In elevated [CO2], the more southerly clones had a higher initial N use efficiency (more carbon assimilated per unit of leaf N) than the more northerly clones, so that they had more N available for those processes or organs that were most limiting to growth at a particular time. This may explain the initial higher growth stimulation by elevated [CO2] in the North Bend clones than in the Skidegate clones." @default.
- W2330990906 created "2016-06-24" @default.
- W2330990906 creator A5032609427 @default.
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- W2330990906 date "1999-10-01" @default.
- W2330990906 modified "2023-09-25" @default.
- W2330990906 title "Long-term effects of elevated carbon dioxide concentration and provenance on four clones of Sitka spruce (Picea sitchensis). II. Photosynthetic capacity and nitrogen use efficiency" @default.
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- W2330990906 doi "https://doi.org/10.1093/treephys/19.12.807" @default.
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