Abstract
Conclusions
Scharlach red, dissolved in ether and applied to decapitated shoots of Kalanchoe Daigremontiana, produces crown gall-like overgrowths which are characterized by leafy shoots and roots, and which resemble typical crown galls induced by P. tumefaciens.
Other carcinogenic agents as 1,2,5,6-dibenzanthracene, methyl-cholanthrene, and benzpyrene applied in lanolin cause injuries to the treated stem without inducing overgrowths on the Kalanchoe. Roots are produced by the Kalanchoes below and above the areas treated with 1,2,5,6-dibenzanthracene, methylcholanthrene, and benzpyrene. Indole acetic acid induces an abundance of long, white roots on the Kalanchoe, together wth small intumescences which are viable for only short periods. Roots are also produced on injured Kalanchoes when treated with lanolin alone. Root formation on the Kalanchoe induced by substances other than the heteroauxin studied here, results from injury which stimulates the host cells to produce root-forming substances. These substances appear to be transported to parts of the stem below and above the treated areas.
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