Florigen, a hypothetical plant hormone is thought to be controlling flowering in plants. It is produced in leaves and migrates to shoot apices to induce flowering after perceiving the inductive photoperiod.
In some plants, flowering is controlled by the exposure to a period of low temperature that induces flowering, i.e. vernalisation. A hypothetical hormone vernalin regulates the process.
Some other examples of hormones inducing flowering are cytokinin. Auxin also promotes flowering in pineapples.
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