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  • 1
    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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  • 2
    Electronic Resource
    Electronic Resource
    Acclimation of Arabidopsis thaliana to the light environment: changes in photosynthetic function (1995)
    Springer
    Planta 197 (1995), S. 306-312 
    Details
    ISSN: 1432-2048
    Keywords: Arabidopsis ; Photosynthesis ; Chlorophyll fluorescence ; Oxygen evolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Arabidopsis thaliana (L.) Heynh. cv. Landsberg erecta was grown under light regimes of differing spectral qualities, which results in differences in the stoichiometries of the two photosynthetic reaction centres. The acclimative value of these changes was investigated by assessing photosynthetic function in these plants when exposed to two spectrally distinct actinic lights. Plants grown in an environment enriched in far-red light were better able to make efficient use of non-saturating levels of actinic light enriched in long-wavelength red light. Simultaneous measurements of chlorophyll fluorescence and absorption changes at 820 nm indicated that differences between plants grown under alternative light regimes can be ascribed to imbalances in excitation of photosystems I and II (PSI, PSII). Measurements of chlorophyll fluorescence emission and excitation spectra at 77 K provided strong evidence that there was little or no difference in the composition or function of PSI or PSII between the two sets of plants, implying that changes in photosynthetic stoichiometry are primarily responsible for the observed differences in photosynthetic function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202652
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  • 3
    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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  • 4
    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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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Theoretical assessment of alternative mechanisms for non-photochemical quenching of PS II fluorescence in barley leaves (1993)
    Springer
    Photosynthesis research 36 (1993), S. 119-139 
    Details
    ISSN: 1573-5079
    Keywords: energy dissipation ; photoinhibition ; photosynthesis ; Photosystem II ; quantum yield ; state transition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The components of non-photochemical chlorophyll fluorescence quenching (qN) in barley leaves have been quantified by a combination of relaxation kinetics analysis and 77 K fluorescence measurements (Walters RG and Horton P 1991). Analysis of the behaviour of chlorophyll fluorescence parameters and oxygen evolution at low light (when only state transitions — measured as qNt — are present) and at high light (when only photoinhibition — measured as qNi — is increasing) showed that the parameter qNt represents quenching processes located in the antenna and that qNi measures quenching processes located in the reaction centre but which operate significantly only when those centres are closed. The theoretical predictions of a variety of models describing possible mechanisms for high-energy-state quenching, measured as the residual quenching, qNe, were then tested against the experimental data for both fluorescence quenching and quantum yield of oxygen evolution. Only one model was found to agree with these data, one in which antennae exist in two states, efficient in either energy transfer or energy dissipation, and in which those photosynthetic units in a dissipative state are unable to exchange energy with non-dissipative units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00016277
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  • 7
    Electronic Resource
    Electronic Resource
    The effects of elevated light on Photosystem II function: A thermoluminescence study (1997)
    Springer
    Photosynthesis research 54 (1997), S. 169-183 
    Details
    ISSN: 1573-5079
    Keywords: chlorophyll fluorescence quenching ; photoinhibition ; photoprotection ; photosynthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We have used the technique of thermoluminescence (TL) to investigate high-light-induced chlorophyll fluorescence quenching phenomena in barley leaves, and have shown it to be a powerful tool in such investigations. TL measurements were taken from wild-type and chlorina f2 barley leaves which had been dark-adapted or exposed to 20 min illumination of varying irradiance or given varying periods of recovery following strong irradiance. We have found strong evidence that there is a sustained trans-thylakoid ΔpH in leaves following illumination, and that this ΔpH gives rise to quenching of chlorophyll fluorescence which has previously been identified as a slowly-relaxing component of antenna-related protective energy dissipation; we have identified a state of the PS II reaction centre resulting from high light treatments which is apparently able to perform normal charge separation and electron transport but which is ‘non-photochemically’ quenched, in that the application of a light pulse of high irradiance cannot cause the formation of a high fluorescent state; and we have provided evidence that a transient state of the PS II reaction centre is formed during recovery from such high light treatments, in which electron transport from QAto QBis apparently impaired.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005969312448
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  • 8
    Electronic Resource
    Electronic Resource
    Structural and functional heterogeneity in the major light-harvesting complexes of higher plants (1999)
    Springer
    Photosynthesis research 61 (1999), S. 77-90 
    Details
    ISSN: 1573-5079
    Keywords: acclimation ; chlorophyll fluorescence ; LHC II ; energy dissipation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The major light-harvesting complex (LHC IIb) of higher plants plays a crucial role in capturing light energy for photosynthesis and in regulating the flow of energy within the photosynthetic apparatus. Multiple isoforms of the protein bind chlorophyll and xanthophyll chromophores, but it is commonly believed that the pigment-binding properties of different LHC IIb complexes are conserved within and between species. We have investigated the structure and function of different LHC IIb complexes isolated from Arabidopsis thaliana grown under different light conditions. LHC IIb isolated from low light-grown plants shows increased amounts of the Lhcb2 gene product, increased binding of chlorophyll a, and altered energy transfer characteristics. We suggest that Lhcb2 specifically binds at least one additional chlorophyll a compared to the Lhcb1 gene product, and that differences in the functioning of LHC IIb from high and low light-grown plants are a direct consequence of the change in polypeptide composition. We show that changes in LHC IIb composition are accompanied by changes in photosynthetic function in vivo and discuss the possible functional significance of LHC IIb heterogeneity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006243005318
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  • 9
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    Causal associations of blood lipids with risk of ischemic stroke and intracerebral hemorrhage in Chinese adults (2019)
    Springer Nature
    Details
    Publication Date: 2019-03-11
    Print ISSN: 1078-8956
    Electronic ISSN: 1546-170X
    Topics: Biology , Medicine
    Published by Springer Nature
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  • 10
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    Author Correction: New genetic signals for lung function highlight pathways and chronic obstructive pulmonary disease associations across multiple ancestries (2019)
    Springer Nature
    Details
    Publication Date: 2019-05-20
    Print ISSN: 1061-4036
    Electronic ISSN: 1546-1718
    Topics: Biology , Medicine
    Published by Springer Nature
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