1. Corn and mustard seedlings grown either in the light or the dark
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2. Lettuce seed germination is a typical photoreversible response
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3. Absorption spectra of purified phytochrome in the Pr and Pfr forms overlap
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4. Three types of phytochrome responses, based on their sensitivities to fluence
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5. LFR action spectra for photoreversible stimulation / inhibition of seed germination
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6. Structure of the Pr and Pfr forms of the chromophore
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7. Figure 17.7 Several structural domains in phytochrome and cellular changes it mediates
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8. N-terminal portion of a bacterial phytochrome
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9. Figure 17.9 (B) Plant phytochrome
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10. Figure 17.10 Nuclear localization of phy–GFP in epidermal cells of Arabidopsis hypocotyls
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11. Figure 17.11 Phytochrome deficiencies alter growth and development in pea and tomato
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12. Figure 17.12 Differences in phytochrome gene family structure and function
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13. Phytochrome activity is modulated by phosphorylation status
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14. Phytochrome activation affects membrane potential (~5 sec)
Phytochrome affects transcription (lag time of less than 5 min)

15. Transcriptional regulation
Phytochrome interacting factors (PIFs) act as negative regulators of phytochrome response: PIF mutants exhibit a constituative photomorphogenic response even when plants are grown in the dark.
Phytochrome initiates degradation of PIFs in the nucleus

17. Shade avoidance

18. Figure 25.23 Phytochrome control of flowering by red (R) and far-red (FR) light
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