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Plant and Cell Physiology, 1974, Vol. 15, No. 2 273-279
© 1974

Article

Absorption of cobalt by excised barley roots

G. Craig Colclasure and Walter E. Schmid

Botany Department, Southern Illinois University Carbondale, Illinois 62901, U.S.A.

Co absorption by excised roots of Hordeum vulgare L. appears to be an active process exhibiting a Q10 of 2.2. The effects of poisons also indicate active absorption. After 1 hr difluorodinitrobenzene at a concentration of 5000 µM inhibited it to 20% of the control, while dinitrophenol (500 µM) and carbonyl cyanide phenylhydrazone (100 µM) inhibited it to 43% and 38% respectively. A study of absorption kinetics over a concentration range of 1 through 100 µM CoCl2 indicated that a number of carrier sites were available for absorption depending upon the concentration. Results which were consistent with this interpretation were obtained when the concentration of a competing ion, Ni, was varied. An exchangeable, absorbed fraction amounting to about 25% of the total cobalt present in the tissue after 1 hr of absorption was found.

(Received September 28, 1973; )
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