Summary
Electroosmotic measurements on the excised vascular strand from the petiole of the water plant Nymphoides peltatum have been carried out, and the Onsager coefficients obtained. About 120 water moleculer per ion are carried electroosmotically when the strand is in 10-4 M KCl, about 30 in 10-1 M KCl. Potential measurements made on an intact and functioning petiole are discussed in the light of the pressure-flow and electroosmotic theories of translocation.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Daintý, J., P. C. Croghan, and D. S. Fensom: Electro-osmosis, with some applications to plant physiology. Canad. J. Bot. 41, 953–966 (1963).
Fensom, D. S.: The bio-electric potentials of plants and their functional significance. I. An electrokinetic theory of transport. Canad. J. Bot. 35, 573–582 (1957).
—: The bio-electric potentials of plants and their functional significance. II. The patterns of bio-electric potential and exudation rate in excised sunflower roots and stems. Canad. J. Bot. 36, 367–383 (1958).
—: The bio-electric potentials of plants and their functional significance. IV. Changes in rate of water absorption in excised stems of Acer saccharum induced by applied electromotive forces: the “Flushing Effect”. Canad. J. Bot. 40, 405–413 (1962).
—: The bio-electric potential of plants and their functional significance. V. Some daily and seasonal fluctuations in the electrical potential and resistance of living trees. Canad. J. Bot. 41, 831–851 (1963).
—, and J. Dainty: Electro-osmosis in Nitella. Canad. J. Bot. 41, 685–691 (1963).
— S. Meylan, and P. E. Pilet: Induced electro-osmosis in root tissues. Canad. J. Bot. 43, 453–467 (1965).
— D. J. Ursino, and C. D. Nelson: Determination of relative pore size in living membranes of Nitella by the techniques of electroosmosis and radioactive tracers. Canad. J. Bot. 45, 1267–1275 (1967).
Johnson, R. P. C.: Microfilaments in pores between frozen etched sieve elements. Planta (Berl.) 81, 314–332 (1968).
—: Crystalline fibrils and complexes of membranes in the parietal layer in sieve elements. Planta (Berl.) 84, 68–80 (1969).
Kedem, O., and A. Katchalsky: Permeability of composite membranes. Parts I, II, III. Trans. Faraday Soc. 59 (1963).
MacKaý, D., and P. Meares: The electrical conductivity and osmotic permeability of a cation exchange resin. Trans. Faraday Soc. 55, 1221–1238 (1959).
MacRobbie, E. A. C., and D. S. Fensom: Measurements of electro-osmosis in Nitella translucens. J. exp. Bot., in press (1969).
Mehta, A. S., and D. C. Spanner: The fine structure of the sieve tubes of the petiole of Nymphoides peltatum (Gmel.) O. Kunze. Ann. Bot., N.S. 26, 291–299 (1962).
Spanner, D. C.: The translocation of sugar in sieve tubes. J. exp. Bot. 9, 332–342 (1958).
—, and J. N. Prebble: The movement of tracers along the petiole of Nymphoides peltatum. 1. A preliminary study with 137 Cs. J. exp. Bot. 13, 294–306 (1962).
Ziegler, H., and C. H. Vieweg: Der experimentelle Nachweis einrr, Massenströmung im Phloem von Heracleum mantegazzianum Somm. et Leý. Planta (Berl.) 56, 402–408 (1961).
Author information
Authors and Affiliations
Additional information
This work has been made possible for one of us (D. S. Fensom) through the assistance of the National Research Council of Canada and a special grant from the Marjorie Young Bell Fund of Mount Allison University.
Rights and permissions
About this article
Cite this article
Fensom, D.S., Spanner, D.C. Electro-osmotic and biopotential measurements on phloem strands of Nymphoides . Planta 88, 321–331 (1969). https://doi.org/10.1007/BF00387460
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00387460