Abstract
A directed translocation of 14C-labelled photoassimilates was shown to occur in the thalli of six species of brown seaweeds belonging to the Fucales. The apical growing regions of these algae act as strong sinks in the “source-tosink” relationship of the long-distance transport. Physical interruptions of the thalli showed that the midrib is the main pathway of the assimilates in Fucus vesiculosus and F. serratus. 14C-histoautoradiography has shown that translocation takes place through the filamentous cells of the medulla. The translocation velocity of the labelled assimilates, calculated from time source profiles of the tracer, was estimated to be 2 to 4 cm · h-1. It is suggested that the sieve elements of the Fucales act in a way similar to the conducting sieve elements of the Laminariales.
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Communicated by O. Kinne, Hamburg
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Diouris, M., Floc'h, J.Y. Long-distance transport of 14C-labelled assimilates in the Fucales: directionality, pathway and velocity. Mar. Biol. 78, 199–204 (1984). https://doi.org/10.1007/BF00394701
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DOI: https://doi.org/10.1007/BF00394701