Effect of a Growth Inhibitor on the Hydroxyproline Level in Cell Wall of Zea Primary Roots

Evidence supporting the view that there is an inverse relationshipbetween the hydroxyproline-protein level in the cell wall andthe ability of a cell to undergo rapid cell elongation was obtained.A growth inhibitor extracted from Zea primary roots acceleratedthe incorporation of radioactivity derived from ¹⁴C-prolineinto the sodium lauryl sulfate (SLS)-insoluble cell wall fraction.However, the inhibitor had no effect on the ratio of hydroxyprolineto proline that was incorporated into the SLS-insoluble fraction. We have discussed what this growth inhibitor may mean in thegeotropic curvature of Zea primary roots. ¹ Present address: Faculty of Education, University of Yamagata,Yamagata 990, Japan (Received May 9, 1981; Accepted August 8, 1981)