The Effects of CCC, Ethrel, Abscisic Acid, Abscisic Aldehyde, and Abscisic Hydrocarbon on the Development and Flowering of Chenopodium rubrum L.

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Abstract
Ethrel, CCC, abscisic acid, and two chemically similar compounds were tested at various concentrations on seedlings and excised stem tips exposed to one of two photoperiodic regimes, one inductive, the other noninductive relative to flowering. None of the substances tested was able to induce or promote flowering of specimens exposed to photoperiodically noninductive conditions. All of the tested substances inhibited or delayed flowering of excised stem tips, and all, with the exception of abscisic hydrocarbon, delayed flowering of seedlings. In most experiments the effects of a test substance on flowering appeared to have been indirect through the substance's inhibitory effect on leaf development. In contrast, the inhibition of flowering of excised stem tips by Ethrel appeared to have been at least partly a direct, rather than mainly a leaf-mediated, process.

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