%0 Journal Article
%A Pinto, Francisco
%A Celesti, Marco
%A Acebron, Kelvin
%A Alberti, Giorgio
%A Cogliati, Sergio
%A Colombo, Roberto
%A Juszczak, Radosław
%A Matsubara, Shizue
%A Miglietta, Franco
%A Palombo, Angelo
%A Panigada, Cinzia
%A Pignatti, Stefano
%A Rossini, Micol
%A Sakowska, Karolina
%A Schickling, Anke
%A Schüttemeyer, Dirk
%A Stróżecki, Marcin
%A Tudoroiu, Marin
%A Rascher, Uwe
%T Dynamics of sun‐induced chlorophyll fluorescence and reflectance to detect stress‐induced variations in canopy photosynthesis
%J Plant, cell & environment
%V 43
%N 7
%@ 1365-3040
%C Oxford [u.a.]
%I Wiley-Blackwell
%M FZJ-2020-01860
%P 1637-1654
%D 2020
%X Passive measurement of sun‐induced chlorophyll fluorescence (F) represents the most promising tool to quantify changes in photosynthetic functioning on a large scale. However, the complex relationship between this signal and other photosynthesis‐related processes restricts its interpretation under stress conditions. To address this issue, we conducted a field campaign by combining daily airborne and ground‐based measurements of F (normalized to photosynthetically active radiation), reflectance and surface temperature and related the observed changes to stress‐induced variations in photosynthesis. A lawn carpet was sprayed with different doses of the herbicide Dicuran. Canopy‐level measurements of gross primary productivity indicated dosage‐dependent inhibition of photosynthesis by the herbicide. Dosage‐dependent changes in normalized F were also detected. After spraying, we first observed a rapid increase in normalized F and in the Photochemical Reflectance Index, possibly due to the blockage of electron transport by Dicuran and the resultant impairment of xanthophyll‐mediated non‐photochemical quenching. This initial increase was followed by a gradual decrease in both signals, which coincided with a decline in pigment‐related reflectance indices. In parallel, we also detected a canopy temperature increase after the treatment. These results demonstrate the potential of using F coupled with relevant reflectance indices to estimate stress‐induced changes in canopy photosynthesis.
%F PUB:(DE-HGF)16
%9 Journal Article
%$ pmid:32167577
%U <Go to ISI:>//WOS:000529868600001
%R 10.1111/pce.13754
%U https://juser.fz-juelich.de/record/875190