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Unformatted text preview: prior to abscission are activated by phytochrome. Phytochrome promotes flower bud formation in light-dependent flower producing plants. (See discussion in photoperiodism and flowering) Photoperiodism - Circadian Rhythms Activities that occur in "daily" cycles are known as circadian rhythms. Many flowers and leaves open in daylight and close at night. Photosynthesis, auxin production and cell division rates also have circadian rhythms in plants. Circadian rhythm in flowering...
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- Fall '09