单词	photoperiod
释义	photoperiod /ˈfəʊtəʊpɪərɪəd / noun Botany & Zoology The period of time each day during which an organism receives illumination; day length.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. Derivatives photoperiodic /fəʊtəʊpɪərɪˈɒdɪk / adjective ... 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.
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