Foliar CO2photoassimilation and chloroplast linear electron transport rates in nitrogen-sufficient and nitrogen-limited soybean plants
作者： J. Michael Robinson , Kent O. Burkey
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摘要: Leaflets of soybean plants which are moderately inorganic nitrogen (N)-limited exhibit either no difference in the rate net photosynthesis or as much a 15–23% lower per unit area than leaflets N-sufficient [Robinson JM (1996) Photosynth Res 50: 133–148; Robinson (1997a) Int J Plant Sci 158: 32–43]. However, mature N-limited have higher CO2photoassimilation chlorophyll at both moderate light intensity (≈500 µmol m-2s-1) and saturating (≈1200 133–148]. This study was undertaken to determine whether chloroplast thylakoids isolated from nitrogen-limited displayed similar linear electron transport rates (H2O → ferredoxin NADP) plants. Chlorophyll concentration reaction mixtures containing prepared manipulated so that it Measurements dependent, NADP O2photo-evolution thylakoid isolates were carried out (≈1500 with \(NH_4^ + \)(an uncoupler) mixtures. Chloroplast plant routinely had 1.5 1.7 times uncoupled, whole chain did The results suggest photosystems photosynthetic components more active Chl leaflet
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