Inhibition of the polar auxin transport by a morphactin

摘要

IAA- and gravity-induced curvatures in coleoptiles are altered by the “morphactin” methyl-2-chloro-9-hydroxyfluorene-(9)-carboxylate (CFM), the length of the curved part of the coleoptile being greatly reduced. A ring of CFM-containing paste blocks the bud-inhibiting effect of IAA when placed between the bud and the site of IAA application. The IAA-transporting capacity ofHelianthushypocotyl sections, as determined by the classical transport method (agar donors and receivers), is greatly reduced by a pretreatment of the sections with