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  • Phytochromes
    • Plant photoreceptors
      • Used to detect the quantity, direction and wavelength of light
        • used to respond to changes in light conditions
    • Protein component bonded to a non-protein, light absorbing pigment molecule
      • 2 isomers of the non-protein component
        • Pr
          • Phytochrome red
            • absorbs red light
              • Converts Pr into Pfr
          • Synthesised by plants
        • Pfr
          • Phytochrome far-red
            • absorbs far red light
              • Converts Pfr back into Pr
                • Occurs slowly in the dark
          • Accumulates in the light
            • More red light absorbed when the sun is out
        • Photoreversible


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