Effect of Morphactin on the Gravimorphism and the Uptake, Translocation and Spatial Distribution of Indol‐3yl‐acetic Acid in Plant Tissues in Relation to Light and Gravity

Abstract

Abstract The changes in geo‐ and photolropism exhibited by plants trealed with morphactin, the methyl‐2‐chloro‐9‐hydroxyfluorene‐(9)‐carboxylic acid, have been explained as inhibition of the basipetal and promotion of the acropetal and lateral transport of indol‐3yl‐acetic acid and the equalization of its levels in horizontally placed plant tissues. The geotropical unresponsiveness of morphactin treated corn coleopliles appeared to be related to the distribution and immobility of starch grains acting as geosensors. The author is indebted to Dr. J. E. Fisher for advice and Mr. W. Richards for his technical assistance.