corn and mustard seedlings grown either in the light or the dark
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Corn and mustard seedlings grown either in the light or the dark. Lettuce seed germination is a typical photoreversible response . Absorption spectra of purified phytochrome in the Pr and Pfr forms overlap. - PowerPoint PPT PresentationTRANSCRIPT
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Corn and mustard seedlings grown either in the light or the dark
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Lettuce seed germination is a typical photoreversible response
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Absorption spectra of purified phytochrome in the Pr and Pfr forms overlap
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Three types of phytochrome responses, based on their sensitivities to fluence
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LFR action spectra for photoreversible stimulation / inhibition of seed germination
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Structure of the Pr and Pfr forms of the chromophore
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Figure 17.7 Several structural domains in phytochrome and cellular changes it mediates
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N-terminal portion of a bacterial phytochrome
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Figure 17.9 (B) Plant phytochrome
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Figure 17.10 Nuclear localization of phy–GFP in epidermal cells of Arabidopsis hypocotyls
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Figure 17.11 Phytochrome deficiencies alter growth and development in pea and tomato
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Figure 17.12 Differences in phytochrome gene family structure and function
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Phytochrome activity is modulated by phosphorylation status
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• Phytochrome activation affects membrane potential (~5 sec)
• Phytochrome affects transcription (lag time of less than 5 min)
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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
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Shade avoidance
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Figure 25.23 Phytochrome control of flowering by red (R) and far-red (FR) light