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Effect of mineral nutrition content on oxygen exchange and chlorophyll a fluorescence in needles of Norway spruce

Effect of mineral nutrition content on oxygen exchange and chlorophyll a fluorescence in needles of Norway spruce

Tree Physiology 17(4): 221-230

ISSN/ISBN: 0829-318X

PMID: 14759861

DOI: 10.1093/treephys/17.4.221

Photosynthetic O(2) evolution at high irradiances (approximately 600-1000 micro mol m(-2) s(-1)) and O(2) uptake in darkness were measured in needles of control, irrigated and irrigated-fertilized trees of Norway spruce (Picea abies (L.) Karst.). Measurements were made at 20 degrees C and at high CO(2) concentrations. The results suggest that, at given times of the year, a major part of the variation in gross photosynthesis of current-year and one-year-old needles across treatments is associated with differences in needle N content. Furthermore, the rate of O(2) uptake measured after 5 or 10 min in darkness was positively correlated with both the preceding rate of gross O(2) evolution and the N content in fully expanded current-year needles. Measurements of chlorophyll a fluorescence, taken simultaneously with measurements of O(2) evolution in current-year sun needles, showed that Stern-Volmer quenching of minimum fluorescence and the ratio of variable to maximum fluorescence in the dark- and light-adapted state were strongly correlated with the gross rate of O(2) evolution. This suggests that the increased rate of gross photosynthesis in needles of irrigated-fertilized trees was associated with adjustments in the thermal energy dissipation within photosystem II.

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Accession: 048882775

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