Summary
Oxygen partial pressures in the vacuolar sap of root cells have been measured using oxygen sensitive polarographic microelectrodes. A significant gradient in oxygen partial pressure was observed across intact sunflower roots growing in air saturated culture solution. The relevance of this finding to the mechanism of salt transfer across the root and in particular to the Crafts-Broyer theory is discussed.
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Bowling, D. J. F.: Measurement of profiles of potassium activity and electrical potential in the intact root. Planta (Berl.) 108, 147–151 (1972).
Bowling, D. J. F., Ansari, A. Q.: Evidence for a sodium influx pump in sunflower roots. Planta (Berl.) 98, 323–324 (1971).
Burton, W. G.: Studies on the dormancy and sprouting of potatoes. I. The oxygen content of the potato tuber. New Phytologist 49, 121–134 (1950).
Crafts, A. S., Broyer, T. C.: Migration of salts and water into xylem of the roots of higher plants. Amer. J. Bot. 25, 529–535 (1938).
Dunlop, J., Bowling, D. J. F.: The movement of ions to the xylem exudate of maize roots. J. exp. Bot. 22, 434–464 (1971).
Fiscus, E. L., Kramer, P. J.: Radial movement of oxygen in plant roots. Plant Physiol. 45, 667–669 (1970).
Kursanov, A. L., Vartapetian, B. B.: Plants and oxygen. Mediterranea 27, 726–734 (1968).
Yu, G. H., Kramer, P. J.: Radial salt transport in corn roots. Plant Physiol. 42, 985–990 (1967).
Yu, G. H., Kramer, P. J.: Radial transport of ions in roots. Plant Physiol. 44, 1095–1100 (1969).
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Bowling, D.J.F. Measurement of a gradient of oxygen partial pressure across the intact root. Planta 111, 323–328 (1973). https://doi.org/10.1007/BF00385551
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DOI: https://doi.org/10.1007/BF00385551