Abstract
Flowering in the short-day speciesChenopodium rubrum L. was stimulated by treatment with abscisic acid (ABA) in concentrations from 1×10−3 M to 1×10−7 M only in plants partly induced by two dark periods. We assume that ABA weakens the inhibitory effect of continuous light (similarly as do some other substancese.g nucleic acid inhibitors) and thus enables the expression of the evoked floral state. ABA was ineffective in promoting flowering in photoperiodically non-induced plants.
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