Biology / Bio 2553 · Atom · ~20 seconds
Photoperiodism
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Photoperiodism is a plant's use of the phytochrome system to track night length, timing flowering and dormancy to season rather than temperature alone.
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A short-day plant flowers once nights exceed a critical length in late summer, using the ratio of active to inactive phytochrome sensed at dawn.
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Day-neutral plants exist too — not every species regulates flowering by photoperiod at all.