The simultaneous movement of two ions in the phloem of the Saxifraga stolon

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Abstract
Paris of tracers were applied simultaneously to the long thin stolons of Saxifraga sarmentosa. After several hours of translocation the very precise pattern of exponential fall-off was examined and interpreted in the light of a model of mass flow with leakage. 42K appears to leak faster than 22Na; 86Rb is very close to 42K. The anion 82Br shows a lower fall-off than 137Cs; this is tentatively regarded as due to a much-reduced leakage, though it might imply a higher velocity. The implications of these findings for sieve-tube mechanism are uncertain.