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  • Photoinhibition  (1)
  • Sunflower (Helianthus annuus)  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Remote sensing of the xanthophyll cycle and chlorophyll fluorescence in sunflower leaves and canopies (1990)
    Springer
    Oecologia 85 (1990), S. 1-7 
    Details
    ISSN: 1432-1939
    Keywords: Chlorophyll fluorescence ; Photosynthesis ; Remote sensing ; Sunflower (Helianthus annuus) ; Xanthophyll cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sudden illumination of sunflower (Helianthus annuus L. cv. CGL 208) leaves and canopies led to excess absorbed PFD and induced apparent reflectance changes in the green, red and near-infrared detectable with a remote spectroradiometer. The green shift, centered near 531 nm, was caused by reflectance changes associated with the de-epoxidation of violaxanthin to zeaxanthin via antheraxanthin and with the chloroplast thylakoid pH gradient. The red (685 nm) and near-infrared (738 nm) signals were due to quenching of chlorophyll fluorescence. Remote sensing of shifts in these spectral regions provides non-destructive information on in situ photosynthetic performance and could lead to improved techniques for remote sensing of canopy photosynthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317336
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Leaf movement, stress avoidance and photosynthesis in Vitis californica (1989)
    Springer
    Oecologia 79 (1989), S. 475-481 
    Details
    ISSN: 1432-1939
    Keywords: Heat stress ; Leaf movement ; Photoinhibition ; Photosynthesis ; Vitis californica
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Gas exchange and chlorophyll fluorescence techniques were used to evaluate the hypothesis that leaf movement in Vitis californica Benth. (California wild grape) allows a compromise between sunlight interception and stress damage in order to maximize photosynthetic carbon gain over the life of the leaf. Leaves that were restrained horizontally tolerated their increased radiation loads if critical temperatures were not exceeded. Reductions in photosynthetic capacity and the F V/F M fluorescence ratio only occurred in leaves that attained high temperatures. Leaf orientation and canopy position were important determinants of leaf temperature. These results indicate that excessive leaf temperature, not high PFD, can be a principle cause of reduced carbon gain and senescence in this species in the wild. Leaf movement appears to protect photosynthetic components in midsummer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00378664
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    Paper (German National Licenses)
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