Abstract
Morphactin, methyl 2-chloro-9-hydroxyfluorene-9-carboxylate (IT 3456), is a synthetic growth regulator with a unique action affecting various morphogenetic and physiological processes in plants, and has been characterized as a specific inhibitor of auxin polar transport. Morphactin applied at the last internode in decapitated shoots of <em>Bryophyllum calycinum</em> substantially stimulated elongation and thickening of the internode. Benzyladenine applied alone little affected stem elongation and thickening. Simultaneous application of benzyladenine and morphactin showed a synergistic effect on thickening, while it did not on elongation. These results suggest that morphactin translocated basipetally from the top of the treated internode inhibits auxin polar transport from the internode, resulting in the accumulation of endogenous auxin for elongation and thickening in the treated internode of decapitated shoots of <em>Bryophyllum calycinum</em>.
Highlights
Morphactins, consisting of methyl 2-chloro-9hydroxyfluorene-9-carboxylate and its derivatives, are synthetic growth regulators with a unique kind of action that greatly affects various morphogenetic and physiological processes in plants (Schneider, 1970)
Since morphactins have been characterized as specific inhibitors of auxin polar transport (K h a n, 1967; Krelle and Libbert, 1968; Tognoni and A l p i, 1969; Parups, 1970; Schneider, 1970; Naqvi, 1972; Bridges and Wilkins, 1973; Kaldewey et al 1973; Gaither 1975; Gagianas and B e r g, 1977; Katekar and Geissler, 1980; Tamimi and F i r n, 1985), the mode of action of morphactins to influence various morphological processes in growth and development has been considered to be closely related to auxin
Since morphactins have been characterized as specific inhibitors of auxin polar transport, it is possible that morphactins interfere with many processes in plant growth and development relating to auxin polar transport
Summary
Morphactins, consisting of methyl 2-chloro-9hydroxyfluorene-9-carboxylate (morphactin IT 3456) and its derivatives, are synthetic growth regulators with a unique kind of action that greatly affects various morphogenetic and physiological processes in plants (Schneider , 1970). It has been reported that morphactins dispensed through the shoot apex induced diverse malformations in various species of Kalanchoe, the effect being freely transmitted to newly emerging axially branches as well as across leaf lamina differentiating epiphyllous buds (Sawhney and Mahajan , 1995). These results mentioned above support the possible mode of action of morphactins to influence various morphogenetic processes in growth and development that are closely related to auxin transport
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
