TY  - JA
AU  - Pinto Espinosa,F.
AU  - Celesti,M.
AU  - Acebron, K.
AU  - Alberti,G.
AU  - Cogliati, S.
AU  - Colombo,R.
AU  - Juszczak,R.
AU  - Matsubara,S.
AU  - Miglietta,F.
AU  - Palombo,A.
AU  - Panigada,C.
AU  - Pignatti,S.
AU  - Rossini,M.
AU  - Sakowska,K.
AU  - Schickling,A.
AU  - Schüttemeyer,D.
AU  - Strózecki,M.
AU  - Tudoroiu,M.
AU  - Rascher,U.
TI  - Dynamics of sun-induced chlorophyll fluorescence and reflectance to detect stress-induced variations in canopy photosynthesis
SN  - 0140-7791
PY  - 2020///
CY  - United Kingdom
PB  - Blackwell Publishing Ltd, 
KW  - Canopy
KW  - AGROVOC
KW  - Chlorophylls
KW  - Fluorescence
KW  - Inhibition
KW  - Ion exchange
KW  - Photochemistry
KW  - Photosynthesis
KW  - Sprays
KW  - Physiological stress resistance
KW  - Plants
KW  - Daylight
N1  - Peer review; Open Access
N2  - 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.
UR  - https://hdl.handle.net/10883/22104
T2  - Plant Cell and Environment
DO  - https://doi.org/10.1111/pce.13754
ER  -