photoperiod

/foh-tuh-peer-ee-uhd/US // ˌfoʊ təˈpɪər i əd //UK // (ˌfəʊtəʊˈpɪərɪəd) //

光周期,光照时间,光期,光照度

Definitions

n.名词 noun

1
Biology.
- : the interval in a 24-hour period during which a plant or animal is exposed to light.

Broad limits to functional reproductive activity seem to be set by the photoperiod—neuroendocrine system.
These captives had been kept for several months at a temperature of 21 degrees Centigrade, and on a daily photoperiod of 15 hours.
The mice were kept in a room in which temperature and photoperiod were controlled.
In general, Tb's showed a marked circadian cycle in phase with photoperiod.