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    Owners and managers of plant nurseries have to plan lighting schedules for a long-day plant that will flower in February. What lighting periods will be most effective? What color of light should be chosen?

    A long-day plant needs a higher proportion of the Pfr form to Pr form of phytochrome. The plant requires long periods of illumination with light enriched in the red range of the spectrum.

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Source:  OpenStax, Principles of biology ii. OpenStax CNX. Jan 16, 2016 Download for free at https://legacy.cnx.org/content/col11958/1.1
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