Abstract
The transport of 86 Rb + supplied to the middle of young corn leaves was scanned by means of a modified chromatogram scanner and it was found that the movement towards the base was larger than to the apex of both intact and excised leaves. Application of 25 ppm of ABA (abscisic acid) or ethrel (2-chloroethane phosphonic acid) did not affect the pattern of transport. However, the growth substances tested, viz , ABA, ethrel, GA 3 and IAA generally enhanced the rate of 86 Rb + transport towards the base of the leaf.
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