Plant Physiology 66:1190-1195 (1980)
© 1980 American Society of Plant Biologists
Articles
Auxin Transport Inhibitors
IV. EVIDENCE OF A COMMON MODE OF ACTION FOR A PROPOSED CLASS OF AUXIN TRANSPORT INHIBITORS: THE PHYTOTROPINS
Gerard F. Katekar and
Art E. Geissler
Commonwealth Scientific and Industrial Research Organization, Division of Plant Industry, Canberra 2601, Australia
The more active members of a proposed class of auxin transport inhibitors have been shown to have the ability to inhibit the active movement of auxin at concentrations where they have little effect on auxin action and no significant auxin activity. They have also been shown to give rise to characteristic biphasic dose-response curves on cress root growth. Based on these physiological similarities and other common physiological properties, it is concluded that they may achieve their effects by a common mode of action which differs from that of other known auxin transport inhibitors. It is suggested that the name "phytotropins" be given to the class of auxin transport inhibitors now defined by a similar mode of action and common chemical properties.
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