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day length

   Also found in: Encyclopedia, Wikipedia 0.01 sec.
day length
the number of daylight hours per day, increasing towards midsummer and the reverse towards midwinter. The effective trigger in the commencement and cessation of the breeding seasons in those species that demonstrate seasonal breeding.
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The days are shortening - day length on the first of this month was 13 hours and 8 minutes long and will be reduced by an hour and 21 minutes by the 30th.
Measly summer gives way to fall by Telegram & Gazette (Worcester, MA)
The wild grape species Vitis riparia is unusual among wild grapes because it stops growing when the day length drops below 13 hours, which occurs in late August in upstate New York.
Grape varieties by Emerging Food R&D Report
When the microRNA concentration falls below a certain level, enough SPL proteins are produced to activate the flowering process even in the absence of other regulators that measure day length or external temperature.
Scientists discover signaling pathway which ensures that plants ... by Asian News International
 
 
 
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