A RAPID QUANTITATIVE TEST FOR PHYTOTOXICITY AND ITS USE IN THE EXAMINATION OF A SERIES OF ALKYL-SUBSTITUTED CYCLOHEXENONES

摘要

Growth inhibition in 2,4-D stimulated barley coleoptile sections can be used as a measure of phytotoxicity. Reproducible linear regression lines, showing positions and slopes characteristic of the compounds under test, were obtained. A number of alkyl-substituted cyclohexenones (5-alkyl-1-carbethoxy-3-methyl-2-cyclohexen-1-ones and 5-alkyl-3-methyl-2-cyclohexen-1-ones) were examined and found to follow the pattern of behavior anticipated for such a homologous series. In these series phytotoxicity was of a much higher order than fungitoxicity.