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What is phytochrome and what is its significance?

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Phytochrome is bright blue or bluish-green protein found in the plant and acts as a photoreceptor pigment. It occurs in two forms. These are phytochrome PFR p700 (Phytochrome far red) and p660 (Phytochrome red pr.) These two forms are interconvertible. It is believed that these two forms control the formation of the hormone necessary for flowering in plants

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