Mineral nutrient deficiency increases the sensitivity of photosynthesis to sulphur dioxide in needles of a coniferous tree,Abies nordmanniana |
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Authors: | Iris Jung Klaus Winter |
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Institution: | (1) Lehrstuhl für Botanik II der Universität, Mittlerer Dallenbergweg 64, W-8700 Würzburg, Federal Republic of Germany;(2) Present address: Smithsonian Tropical Research Institute, P.O. Box 2072, Balboa, Republic of Panama |
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Abstract: | Summary
Abies nordmanniana (Stev.) Spach was cultivated in rooting media either rich in nutrients (control) or low in magnesium (low Mg) or low in magnesium and nitrogen (low Mg-N), respectively. Intact, attached needles were exposed, in the light (460 mol photons m-2 s-1), to an atmosphere containing 1 ppm SO2 for 5 h. Measurements of light- and CO2-saturated rates of photosynthetic O2 evolution, A
max, were performed before and after SO2 treatments. In needles from well fertilized plants, A
max was high (about 50 mol m-2 s-1) and was not affected by SO2. Needles from low-Mg and low-Mg-N plants had lower photosynthetic rates and showed a marked decline in A
max in response to the SO2 treatment. Stomatal conductance was similar in the three groups of plants during SO2 treatments.Abbreviations
A
max
photosynthetic capacity (CO2- and light-saturated rate of O2 evolution)
- DW
dry weight
- Fo
yield of dark level fluorescence
- FM
maximum yield of fluorescence, induced in a pulse of saturating light
- Fv
yield of variable fluorescence (= FM–FO)
- FW
fresh weight; g, conductance to water vapor transfer |
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Keywords: | Abies Mineral deficiency Photosynthesis Sulphur dioxide |
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