Abstract
Abstract Flowering of the model plant speciesArabidopsis thalianais influenced by the length of time that the plants are exposed to light (photoperiod) during each day. We have studied mutations that reduce or abolish the promotion of flowering that is normally seen under long photoperiods. One of the genes affected by one of these mutations has been cloned, and is predicted to encode a transcription factor. We are also studying mutations that prevent the delay in flowering that is normally found when plants are grown under short photoperiods, and the genes affected by some of these mutations are being cloned. Mutations causing early and late flowering have also been combined in double mutants, and the phenotypes of these plants suggest how these different types of flowering time genes might interact.
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