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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