Studies on response of bean seedlings & corn roots to malformin

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Abstract
On bean stems, malformin isolated from culture filtrates of Aspergillus niger, produced a visible response when 1 x 10-4 [mu]g/plant was applied. The optimum response required approximately 1 x 10-1 [mu]g/plant. Neither wet nor dry weights of malformin-treated plants differed from the controls. Malformin was translocated through the roots of bean plants to the region of the apical meristem. When various regions of corn roots were treated with malformin, curvatures were obtained only when the tips were treated. The optimum response was obtained using 1 x 10-3 [mu]g/root tip and 1 x 10-4 [mu]g/root could be detected. Malformin was active on the above ground portions of 20 out of 28 species of dicotyledons. On monocotyledons, only onion and Sudangrass responded out of 9 species tested. Attempts to show a response on the roots of dicotyledons failed.