The Plant Hormone Concept: Transport, Concentration, and Sensitivity

摘要: The idea that transport was an essential part of the role plant hormones originally came from experiments on phototropic control coleoptile growth. hypothesis IAA synthesized in tip, transported basipetally and then redistributed laterally to give differential growth bending. We now know most coming tip is not situ tryptophan but comes IAA-inositol source endosperm grain (see Chapter Bl), transported, as free or IAA-conjugate, where conjugate hydrolysis occurs. While so far we have only a minor deviation original concept, many studies failed show redistribution response tropistic stimuli. In addition, by Firn Digby (7) that, at least some cases, begins all along stem same time, faster than auxin can be tip. Thus, if involved responses stems it must already in, responding tissue rather being redirected transit If cut longitudinally half laid its side, bottom will grow top half, across entire necesary for