TRANSLOCATION OF SR-85, CS-137, CO-57, AND ZN-65 THROUGH STOLONIFEROUS-HAPTERA BETWEEN THE THALLI OF ECKLONIA-STOLONIFERA OKAMURA (LAMINARIALES, PHAEOPHYTA)

Four radioisotopes (Sr-85, Cs-137, Co-57, and Zn-65) were inoculated a t the meristem of adult or juvenile blades of the brown alga Ecklonia stolonifera Okamura in which the adult thallus is connected with the j uvenile thallus by stoloniferous haptera. The result clearly showed th at Sr-85, Cs-137, and Co-57 were translocated in the thallus. Three ho urs after inoculation to the meristem of the adult blade, the highest radioactivity of translocated isotopes was obtained in the juvenile bl ade. When inoculated to the meristem of the juvenile blade, high radio activities were observed in the stolon and haptera after one hour, whe reas after 2-3 hours high radioactivity was observed in the meristem o f the adult blade. It is clear that these elements taken up from the b lade meristem are translocated to another blade through the stipe and stoloniferous haptera. Zn-65, however, did not show a clear tendency o f translocation.