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The Uptake and Transport of 14 C in Cells of Conocephalum conicum L. in Light

KASIMIERZ TREBACZ and DAVID FENSOM
Journal of Experimental Botany
Vol. 40, No. 219 (October 1989), pp. 1089-1092
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/23692017
Page Count: 4
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The Uptake and Transport of
          14
          C in Cells of Conocephalum conicum L. in Light
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Abstract

Dissolved inorganic 14carbon, fed to a small portion of the tissue of Conocephalum conicum, travelled along the tissues from cell to cell at rates of about 2.0 to 1.7 μm s-1, which is of the same order of magnitude as streaming rates in these cells. Transcellular transport can take place against a pressure gradient, but pressure gradients of 200 kPa or more in either direction reduced the trans-cellular transport significantly without reducing streaming rate and are, therefore, thought to have induced 'valving' effects at the plasmodesmata. Ammonium ion reduced or inhibited transport without reducing streaming rates and is, therefore, thought to have inhibited an active component in the plasmodesmata. Thus the results obtained from tandem cells of Nitella can be transferred to tissues.

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