Abstract
1. In pea seedlings, a ring of lanolin paste which contains the morphactin CFM reduces the IAA-dependent correlative inhibition of axillary buds, provided the ring is localized between the buds and the apical applied IAA. 2. CFM inhibits the basipetal IAA transport from donator agar blocks through sunflower hypocotyl sections into receiver agar blocks. 3. Gravity-induced curvatures of wheat coleoptile tips and IAA-induced curvatures of oat coleoptiles ( Avena standard curvature test) are altered by CFM, the length of the curved part of the coleoptile being greatly reduced. 4. In the Avena standard curvature test, CFM does not induce curvatures, but reduces IAA-induced curvatures. 5. CFM reduces the activity of the sulfhydryl enzyme urease. Cystein diminishes this reduction. 6. Cystein partially or completely counteracts the CFM effects on adventitious root initiation of Phaseolus hypocotyl cuttings. 7. It is concluded that CFM affects sulfhydryl-dependent reactions and consequently inhibits, among other things, active transport mechanisms and their sequential reactions.
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