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  • Photoreceptor  (2)
  • Photosystem stoichiometry  (2)
  • 77 K fluorescence  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Acclimation of Arabidopsis thaliana to the light environment: regulation of chloroplast composition (1995)
    Springer
    Planta 197 (1995), S. 475-481 
    Details
    ISSN: 1432-2048
    Keywords: Arabidopsis ; Blue light ; Photoreceptor ; Photosynthesis ; Photosystem stoichiometry ; Phytochrome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The regulation by light of the composition of the photosynthetic apparatus was investigated in Arabidopsis thaliana (L.) Heynh. cv. Landsberg erecta. When grown in high- and low-irradiance white light, wild-type plants and photomorphogenic mutants showed large differences in their maximum photosynthetic rate and chlorophyll a/b ratios; such changes were abolished by growth in red light. Photosystem I (PSI) and PSII levels were measured in wild-type plants grown under a range of light environments; the results indicate that regulation of photosystem stoichiometry involves the specific detection of blue light. Supplementing red growth lights with low levels of blue light led to large increases in PSII content, while further increases in blue irradiance had the opposite effect; this latter response was abolished by the hy4 mutation, which affects certain events controlled by a blue-light receptor. Mutants defective in the phytochrome photoreceptors retained regulation of photosystem stoichiometry. We discuss the results in terms of two separate responses controlled by blue-light receptors: a blue-high-fluence response which controls photosystem stoichiometry; and a blue-low-fluence response necessary for activation of such control. Variation in the irradiance of the red growth light revealed that the blue-high-fluence response is attenuated by red light; this may be evidence that photosystem stoichiometry is controlled not only by photoreceptors, but also by photosynthetic metabolism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196669
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Acclimation of Arabidopsis thaliana to the light environment: the role of photoreceptors (1999)
    Springer
    Planta 209 (1999), S. 517-527 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Acclimation ; Arabidopsis (acclimation) ; Chloroplast ; Photomorphogenesis ; Photoreceptor ; Photosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The regulation by light of the composition of the photosynthetic apparatus was investigated in photomorphogenic mutants of Arabidopsis thaliana (L.) Heynh. cv. Landsberg erecta. Leaf chlorophyll, photosynthesis, photosystem II function, and ribulose-1,5-bisphosphate carboxylase-oxygenase and photosystem II contents were determined for plants grown under high- or low-irradiance growth regimes. Although certain mutant lines had altered chloroplast composition compared to the wild type, all photoreceptor mutants tested were capable of light-dependent changes in chloroplast composition and photosynthetic function, indicating that photoreceptors do not play a central role in the regulation of acclimation at the level of the chloroplast. However, the clear acclimation defect in a det1 signal transduction mutant indicates that photoreceptor-controlled responses either share regulatory components with acclimation, or are important in the expression of components which in turn regulate acclimation. We suggest that the COP/DET/FUS regulatory cluster is a focus for multiple signal transduction pathways, including some of the metabolic signals which form the basis for the acclimatory response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050756
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Acclimation of Arabidopsis thaliana to the light environment: Changes in composition of the photosynthetic apparatus (1994)
    Springer
    Planta 195 (1994), S. 248-256 
    Details
    ISSN: 1432-2048
    Keywords: Arabidopsis ; Chlorophyll-binding proteins ; Photomorphogenesis ; Photosynthesis ; Photosystem stoichiometry ; Thylakoid membrane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Acclimation to changes in the light environment was investigated in Arabidopsis thaliana (L.) Heynh. cv. Landsberg erecta. Plants grown under four light regimes showed differences in their development, morphology, photosynthetic performance and in the composition of the photosynthetic apparatus. Plants grown under high light showed higher maximum rates of oxygen evolution and lower levels of light-harvesting complexes than their low light-grown counterparts; plants transferred to low light showed rapid changes in maximum photosynthetic rate and chlorophyll-a/b ratio as they became acclimated to the new environment. In contrast, plants grown under lights of differing spectral quality showed significant differences in the ratio of photosystem II to photosystem I. These changes are consistent with a model in which photosynthetic metabolism provides signals which regulate the composition of the thylakoid membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00199685
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Resolution of components of non-photochemical chlorophyll fluorescence quenching in barley leaves (1991)
    Springer
    Photosynthesis research 27 (1991), S. 121-133 
    Details
    ISSN: 1573-5079
    Keywords: high-energy state quenching ; photoinhibition ; photosynthesis ; state transition ; 77 K fluorescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Non-photochemical chlorophyll fluorescence quenching (qN) in barley leaves has been analysed by monitoring its relaxation in the dark, by applying saturating pulses of light. At least three kinetically distinct phases to qN recovery are observed, which have previously been identified (Quick and Stitt 1989) as being due to high-energy state quenching (‘fast’), excitation energy redistribution due to a state transition (‘medium’) and photoinhibition (‘slow’). However, measurements of chlorophyll fluorescence at 77 K from leaf extracts show that state transitions only occur in low light conditions, whereas the ‘medium’ component of qN is very large in high light. The source of that part of the ‘medium’ component not accounted for by a state transition is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033251
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    Paper (German National Licenses)
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