Photoperiodism is the regulation of seasonal activity (flowering) by day ____.Flowering is triggered by changes in ____. Long day plants (LDP) flowering is induced by ____ nights, when the Critical Day Length (CDL) ____ a certain value. Therefore, LDP will flower in ____ when nights are getting ____. Flowering is controlled by the ____ system. Phytochrome is a pigment that exists in two forms, ____ and ____. During the day, Pr absorbs red light and is ____ converted into Pfr. Then, at night, the Pfr is ____ converted back to Pr. Because the night is short, not all the Pfr is converted back to Pr, so a ____ amount of Pfr is left. Pfr is the biologically ____ form of phytochrome and high levels of Pfr ____ flowering in LDP.

Phytochrome System

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