Six New Plant-Growth-Inhibiting Compounds

Abstract

1. Six organic ammonium compounds were found to inhibit internodal elongation of Black Valentine bean seedlings when applied to the stems or leaves: (4-Hydroxy-5-isopropyl-2-methylphenyl)trimethyl ammonium chloride, 1-piperidinecarboxylate (4-Hydroxy-5-isopropyl-2-methylphenyl)trimethyl ammonium iodide, N-β-chloroethyl-N-ethylcarbamate (4-Hydroxy-5-isopropyl-2-methylphenyl)trimethyl ammonium iodide, 1-piperidinecarboxylate (4-Hydroxy-2-isopropyl-5-methylphenyl)trimethyl ammonium iodide, 4-morpholinecarboxylate (4-Hydroxy-2-isopropyl-5-methylphenyl)trimethyl ammonium chloride, 4-morpholinecarboxylate (4-Hydroxy-5-isopropyl-2-methylphenyl)trimethyl ammonium chloride, N, N-bis-(β-chloroethyl) carbamate 2. These ammonium compounds delayed blossoming of bean plants 3-10 days when applied in amounts of approximately 0.1 mg. per plant. 3. One of the more active of these compounds, (4-hydroxy-5-isopropyl-2-methylphenyl)trimethyl ammonium chloride, 1-piperidinecarboxylate, proved to be more effective in inhibiting stem elongation of bean seedlings than did either maleic hydrazide or 2,4-dichlorobenzylnicotinium chloride.