Journalartikel

Jahr der Veröffentlichung: 1990

Seiten: 313-317

Zeitschrift: Journal of Plant Nutrition and Soil Science

Bandnummer: 153

Heftnummer: 5

ISSN: 0044-3263

DOI Link: https://doi.org/10.1002/jpln.19901530505

Verlag: Wiley-VCH Verlag

Abstract: 
18 days old sunflower seedlings were transferred and cultivated for 9 days (until chlorosis appeared) in nutrient solutions. After that Fe concentration of roots and shoots and the subcellular distribution of Fe in the cytoplasm of the young leaves was determined. Bicarbonate in the nutrient solution with Fe reduced the concentration of Fe and chlorophyll in the young leaves of the plants, also the concentration of Fe and protein in the chloroplast fraction of the cytoplasm, but the subcellular distribution for Fe remained unchanged compared with the control. Leaf spray with Fe-EDTA to plants in nutrient solution without Fe + bicarbonate resulted in higher Fe but unchanged chlorophyll concentrations in the young leaves, while the cytoplasm fractions of these leaves had higher concentrations of iron and protein compared with the control. An inactivation of leaf iron by bicarbonate in the nutrient medium could not be demonstrated. There was no significant lowering of the concentration of dissolved Fe in the nutrient solution by bicarbonate, indicating a disturbance of Fe-uptake rather than an insufficient Fe-supply as a factor for iron chlorosis. The physiological activity of leaf applied Fe was not diminished by bicarbonate in the nutrient solution. This observation too points to a primary effect of bicarbonate in the root area. The pH of the cytoplasm from young leaves remained unchanges after leaf spraying with Fe-EDTA. In spite of this there might be a local effect of sprayed solution (with pH 5,1) on the pH of solutes in the apoplast, influencing the mobility of leaf applied Fe.

Harvard-Zitierstil: DOCKENDORF, H. and HOFNER, W. (1990) INFLUENCE OF BICARBONATE ON THE SUBCELLULAR-DISTRIBUTION OF IRON APPLIED TO ROOTS OR LEAVES OF SUNFLOWER (HELIANTHUS-ANNUUS L), Journal of Plant Nutrition and Soil Science = Zeitschrift für Pflanzenernährung und Bodenkunde, 153(5), pp. 313-317. https://doi.org/10.1002/jpln.19901530505

APA-Zitierstil: DOCKENDORF, H., & HOFNER, W. (1990). INFLUENCE OF BICARBONATE ON THE SUBCELLULAR-DISTRIBUTION OF IRON APPLIED TO ROOTS OR LEAVES OF SUNFLOWER (HELIANTHUS-ANNUUS L). Journal of Plant Nutrition and Soil Science = Zeitschrift für Pflanzenernährung und Bodenkunde. 153(5), 313-317. https://doi.org/10.1002/jpln.19901530505