Florigen (or flowering hormone) is the term used to describe the hypothesized hormone-like molecules responsible for controlling and/or triggering flowering in plants. Florigen is produced in the leaves and acts in the shoot apical meristem of buds and growing tips. It is known to be graft-transmissible and even functions between species. However despite having been sought since the 1930s, the exact nature of florigen is still a mystery.
Source : http://en.wikipedia.org/wiki/Florigen
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