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Polarity and Rate of Transport of Cyclic Adenosine 3,5'-Monophosphate in the Coleoptile ¹

^a Division of Biological and Medical Research, Argonne National Laboratory, Argonne, Illinois, 60439

Transport of tritiated cyclic AMP in the coleoptile of oats (Avena sativa) and corn (Zea mays) is polar, with basipetal to acropetal ratios of 4.0 and 3.2, respectively. The rate of transport is approximately that of indoleacetic acid. The linear velocity of transport, however, is at least five times that of auxin. A loss in transport polarity of the nucleotide occurs in subapical tissues within several hours after decapitation of the coleoptile, accompanied by a decrease in transport rate. The loss in polarity is not reversed by exogenous auxin, but the reduction in transport is. Auxin also inhibits the uptake of cyclic AMP. Exogenous cyclic AMP is metabolized rapidly by coleoptile tissues. If cyclic AMP does have a cellular function in the coleoptile, its transport behavior is compatible with that of a hormone.