photoperiod

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photoperiod

 [fo´to-pēr″e-od]
the period of time per day that an organism is exposed to daylight (or to artificial light). adj., adj photoperiod´ic.

photoperiod

/pho·to·pe·ri·od/ (fo´to-pēr″e-od) the period of time per day that an organism is exposed to daylight (or to artificial light).photoperiod´ic

photoperiod

(fō′tō-pîr′ē-əd)
n.
The daily duration of light and dark to which an organism is exposed, considered especially with regard to its effect on growth and development.

pho′to·pe′ri·od′ic (-ŏd′ĭk) adj.

photoperiod

the length of daylight as compared with the length of darkness in each 24 hour cycle. see PHOTOPERIODISM.

photoperiod

the period of time per day that an organism is exposed to daylight (or to artificial light).
References in periodicals archive ?
It seems clear that the historical migration of Cannabis throughout much of the world for purposes of cultivation was accompanied by strong selection for local photoperiodic regime.
Photoperiodic control of the development of the LHRH neurosecretory system of European starlings (Sturnus vulgaris) during puberty and the onset of photorefractoriness.
Since day length is the same in a particular location year after year, but differs from place to place, mosquitoes in individual locales throughout the pitcher plants' range--from north Florida up to Manitoba, and from Nova Scotia across to Minnesota--have evolved separate photoperiodic clocks to regulate their life cycles.
Pineal gland: interface between the photoperiodic environment and the endocrine system.
October, add this step: place the photoperiodic Poinsettia in a dark
all do so during the bulhenjip season, possibly as sensitive photoperiodic responses.
Tenders are invited for Sitc Of Plant Tissue Culture Trolleys, Photoperiodic Timers And Switching Units At Nipgr.
As discussed above, the two kinds of fiber plant that have been recognized taxonomically have been widely hybridized, by legal breeders, because of the resulting heterosis (hybrid vigor); and the two kinds of narcotic plant that have been recognized have been widely hybridized (mostly illicitly) to provide for the different psychological states that many have come to appreciate, and also to generate plants with desired photoperiodic and size characteristics to meet local needs.
No photoperiodic rhythm of egg hatching was found in either species.
Plants were grown on racks with 16 h light/ 8 h dark photoperiodic regime, under 24 [+ or -] 2[degrees]C temperature.
Photoperiodic influences on seasonal breeders depend mostly on the latitude at which they are kept.