Studies on the Relation of Chemical Structure to Plant Growth-Regulator Activity in the Pineapple Plant IV. Hydrazine Derivatives, Compounds with an Unsaturated Aliphatic Moiety and Miscellaneous Chemicals
1. Results of tests with 39 hydrazine derivatives, 30 compounds with an unsaturated aliphatic moiety, and 117 miscellaneous compounds for induction or inhibition of flowering and toxicity to the pineapple plant are given. In addition, the split pea-stem curvature test results are listed for many of the materials. 2. Ethylhydrazine, sym-diethylhydrazine, β-hydroxyethylhydrazine, unsym-bis-(β-hydroxyethyl)hydrazine, 2-hydroxyethyl N-(2-hydroxyethyl)carbazinate, and 2-(2-hydroxyethyl)semicarbazide were the only hydrazine derivatives which forced pineapple plants to flower. The latter two compounds were not active in all tests. 3. Acetylene, ethylene, and propylene were the only unsaturated aliphatic compounds which forced. Several fairly simple modifications of these compounds eliminated their forcing property. 4. A number of compounds with the functional groups named, and several of the miscellaneous compounds, were in some measure inhibitory to flowering or toxic to the pineapple plant, but it is pointed out that a non-toxic inhibitor of flowering has not yet been developed which is sufficiently effective for commercial usage.