A change from the vegetative to the reproductive phase as a result of detection of, or exposure to, a period of light or dark of a given length. The length of the period of light or dark required to initiate the change is set relative to a particular duration known as the 'critical day length'. The critical day length varies between species.
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exact_synonym:
photoperiodic control of flowering time; photoperiodic control of inflorescence development; response to day length, flowering; response to night length, flowering; response to photoperiod, flowering