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TRANSPORT PERIOD IN HOURS 



23 



Fig. 5. The response of coleoptile sections (percentage increase over original 

 length) to materials transported through coleoptile tissue from a "donoi" agar 

 plate (shaded histograms) to a "receptor" plate (unshaded); the donor plate 

 contained NalAA, inhibitor, or a mixture of the two. The response to the 

 apically applied plate is shown on the left of each pair of histograms, that to 

 the basal application on the right. Transport periods were 0, 2, 4, 8, 15, and 23 

 hrs. (For further details see text.) 



