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photoperiod Line breaks: photo|period
Pronunciation: /ˈfəʊtəʊpɪərɪəd/

Definition of photoperiod in English:


Botany & Zoology
The period of time each day during which an organism receives illumination; day length.
Example sentences
  • Canola seedlings were grown in chambers at 23°C, 50% humidity, under 16/8 h day/night photoperiods.
  • Applying balancing pressure did not affect the growth of N-deprived plants except during the photoperiod of day 3 and the dark period of day 4.
  • For enzymatic activities and sugar determinations, samples were collected at the middle of the photoperiod.


Pronunciation: /fəʊtəʊpɪərɪˈɒdɪk/
Example sentences
  • Leaves communicate photoperiodic signals to meristems, stolons and buds in flowering, tuberization and dormancy.
  • Some songbirds modify their sensitivity to the usual photoperiodic cues that control breeding onset, such that photoperiod response thresholds differ between populations at different latitudes.
  • To expose gametophytes to particular photoperiodic conditions, the bagged Petri plates were placed in a light-tight box over which was installed the fluorescent source.
Definition of photoperiod in:
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