“Long-Day” (LD) photoperiod http://en.wikipedia.org/wiki/Phototropin photo period photoperiodism photo period photoperiod must be perceived for flowering to begin photoperiodism http://en.wikipedia.org/wiki/Photoperiodism photoperiodic English English photoperiod English photo period http://en.wikipedia.org/wiki/Photoperio ... day_plants Photoperiodism photoperiodism photoperiod plants photoperiod photo period short day plant en:Photoperiodism http://en.wikipedia.org/wiki/Cryptochrome Photoperiodism photoperiod short day plant short day plant photoperodism en:Photoperiodism photoperiodism photoperiodism photoperiodism http://en.wikipedia.org/wiki/Photoperiodism short day plants photoperiodism long-day plant English http://en.wikipedia.org/wiki/Phytochrome photo period dependent on the night-length photoperiodism “Day-Neutral” dependent on the night-length English short day plants photoperiodism dependent on the night-length photo-periodism photoperiodism English photoperiodism photoperiodism short day lengths short-day plants photoperiodism photoperiodism photoperiodism photoperiodism photojournalism photo period photoperiodism three groups photoperiodic photoperiod photoperiodism day length photoperiodism photoperiod photoperiodism day-neutral English photoperiodism day-neutral photoperiod Photoperiodism http://en.wikipedia.org/wiki/Photoperio ... day_plants “Short-Day” (SD) photoperiod photoperiod photoperiod photoperiodism English Photoperiodism photoperiod http://en.wikipedia.org/wiki/Phytochrome photo period photoperiodism