A Reversible Growth Inhibition of Isolated Tomato Roots

Abstract

Sulfanilamide, sulfapyridine and sulfathiazole inhibit growth of tomato roots in aseptic culture. p-amino benzoic acid but not nicotinic acid or pyridoxine added to the medium abolishes the inhibition. Amt. of benzoic acid needed varies with conc. of inhibitor. Addition of p-amino benzoic acid alone does not increase growth. These tomato roots normally contain this acid or some similar substance. Competition between sulfa compound and acid in cell processes is suggested.