Stimulation of Seedling Growth by Seed Treatments with N-Phenyl Succinimide Derivatives

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Abstract
N-phenylsuccinimide and its monochloro-,2,4-dichloro-, and mononitro- substituted derivatives, as well as some corresponding derivatives of N-phenyl-malimide and N-phenylphthalimide were tested for their effects on wheat and radish seedling growth in 4 day germination tests. 2,4-dichlorophenylsuccinimide solns. in concns. from 10 to 50 ppm. consistently increased the root length between 30-75% as compared with H2O controls. The monochloro derivatives and the unsubstituted phenylsuccinimide were somewhat less effective, as were the nitro-substituted compounds. Corresponding malimides and phthalimides had either less or no activity. Free succinic and the other acids as well as their alkyl-substituted derivatives were inactive. An increase in shoot growth often accompanied the increase in root growth. The increase was greater in the presence of dilute nutrient solns. In young sand cultures only inconsistent increases were obtained, and no significant stimulation was obtained by either seed treatments or subsequent appln. to the plants of the 4 most active succinimide derivatives in field plot tests with corn. It is concluded that the stimulatory effect is limited to the early stages of seedling growth.

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