Remote sensing of the xanthophyll cycle and chlorophyll fluorescence in sunflower leaves and canopies |
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Authors: | J A Gamon C B Field W Bilger O Björkman A L Fredeen J Peñuelas |
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Institution: | (1) Department of Plant Biology, Carnegie Institution of Washington, 290 Panama Street, 94305 Stanford, CA, USA;(2) Present address: Institut de Recerca i Tecnologia Agroalimentâries, 08348 Cabrils (Barcelona), Spain |
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Abstract: | 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.CIW Publication #1072 |
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Keywords: | Chlorophyll fluorescence Photosynthesis Remote sensing Sunflower (Helianthus annuus) Xanthophyll cycle |
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