Abstract
The kinetics of translocation of 14C-labeled photoassimilate were studied in the kelp, Alaria esculenta (L.) Grev., using a Geiger-Müller detector-probe to measure radioactivity in the source and sink regions of dumbbell-shaped explants cut from blades. Rapid tracer efflux from the source occurred for 4 days following a pulse of [14C]bicarbonate, with 40–60% of the initial activity remaining in the source after 10–14 days. Portions of source and sink tissue were analysed for distribution of radioactivity in mannitol, amino-acid, organic-acid and insoluble fractions. About 75% of the radioactivity in both source and sink at the end of the experiments was in soluble organic matter. The translocation velocity of the moving solute front (1.0-1.6 cm·h-1) was derived from time-course profiles of tracer arriving in Alaria sinks. Relative rates of translocation, calculated from these profiles, yielded skewed curves, with maximum rates of import by the sink occurring 72–96 h after the source was pulsed.
Similar content being viewed by others
References
Buggeln, R.G.: Auxin, an endogenous regulator of growth in algae? J. Phycol 12, 355–358 (1976a)
Buggeln, R.G.: The rate of translocation in Alaria esculenta (Laminariales, Phaeophyceae). J. Phycol. 12, 439–442 (1976b)
Buggeln, R.G.: Physiological investigations on Alaria esculenta (Laminariales, Phaeophyceae). III. Exudation by the blade. J. Phycol. 14, 54–56 (1978)
Canny, M.J.: The rate of translocation. Biol. Rev. 35, 507–531 (1960)
Canny, M.J.: Mass transfer. In: Transport in plants, vol. I, Phloem Transport. Encyclopedia of Plant Physiology N.S., vol. 1, pp. 139–153, Zimmermann, M.H., Milburn, J.A. eds. Berlin, Heidelberg, New York: Springer 1975
Fisher, D.B.: Translocation kinetics of photosynthates. In: Phloem Transport, pp 327–358, Aronoff, S., Dainty, J., Gorham, P.R., Srivastava, L.M., Swanson, C.A., eds. New York: Plenum Press 1975
Floc'h J.-Y., Penot, M.: Transport du 32P et du 86Rb chez quelques algues brunes: orientation des migrations et voies de conduction. Physiol. Vég. 10, 677–686 (1972)
Geiger, D.R., Swanson, C.A.: Sucrose translocation in the sugar beet. Plant Physiol. 40, 685–690 (1967)
Lobban, C.S.: A simple, rapid method of solubilizing algal tissue for scintillation counting. Limnol. and Oceanogr. 19, 356–359 (1974)
Schmitz, K., Srivastava, L.M.: Long distance transport in Macrocystis integrifolia. I. Translocation of 14C-labeled assimilates. Plant Physiol. 63, 995–1002 (1979a)
Schmitz, K., Srivastava, L.M.: Long distance transport in Macrocystis integrifolia. II. Tracer experiments with 14C and 32P. Plant Physiol. 63, 1003–1009 (1979b)
Sideman, C.J., Scheirer, D.C.: Some fine structural observations on developing and mature sieve elements in the brown alga Laminaria saccharina. Am. J. Bot. 64, 649–657 (1977)
Tolbert, N.E., Garey, W.: Apparent total CO2 equilibrium point in marine algae during photosynthesis in seawater. Aust. J. Plant Phyiol 3, 69–72 (1976)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Buggeln, R.G., Lucken, S. Kinetic characteristics of photoassimilate translocation in Alaria esculenta (Laminariales, Phaeophyceae). Planta 147, 241–245 (1979). https://doi.org/10.1007/BF00388745
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00388745