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Abstract

Vegetation dynamically reacts to the available photosynthetically active radiation (PAR) by adjusting the photosynthetic apparatus to either a light harvesting or a photoprotective modus. When activating the photoprotection mechanism, either minor or major pigment-protein interactions may occur at the leaf level, resulting in different light absorption and consequently reflectance intensities. The reflectance changes were measured during sudden illumination transients designed to provoke fast adaptation to high irradiance. Different spectral reflectance change features were observed during different stages of photoprotection activation, extending over part of the visible spectral range (i.e. 490-650 nm). Due to this multiple wavelength reflectance modification, which affects also the reference band at 570 nm, the commonly used Photochemical Reflectance Index (PRI) is unable to trace and quantify such strong photoprotection mechanism. To quantify the entire photoprotection with a required accuracy, the spectral changes in the full visible range must be characterized.

Item Type:	Conference Publication
Authors/Creators:	Van Wittenberghe, S and Alonso, L and Malenovsky, Z and Moreno, J
Keywords:	Non-photochemical quenching (NPQ), conformational changes, photoprotective pigments, photosynthesis, FLEX, hyperspectral mission
Journal or Publication Title:	Proceedings of the 2018 IEEE International Symposium Geoscience and Remote Sensing
Publisher:	Institute of Electrical and Electronics Engineers
Copyright Information:	Copyright 2018 IEEE
Related URLs:	Google Scholar: Malenovsky, Z UTAS Profile: Malenovsky, Z
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