In this paper optical indices calculated from leaf reflectance measurements, acquired with a high resolution spectroradiometer, were investigated to monitor O3 stress on Fagus sylvatica L. from the strain phase to the damage phase when visible symptoms occur (e.g. chlorosis, leaf browning). The CI (Chlorophyll Index) was the most sensible index to a wide range of chlorophyll (Chl) concentrations (R2=0.93), the simple ratio R695/R740 (Ctr2) was the most correlated to carotenoids/chlorophyll (Car/Chl) ratio (R2=0.65), while YI (Yellowness Index) was sensible to Car/Chl ratio and to low Chl values but tends to saturate at moderate to high Chl concentrations. PRI (Photochemical Reflectance Index) was correlated with the physiological parameters NPQ (Non Photochemical Quenching) and ΔF/Fm' confirming this index is a good indicator of photosynthetic efficiency. Results from this experiment showed that CI, Ctr2 and PRI were reliable indices of O3 effects on Fagus sylvatica L. before visible symptoms occurred, while YI was able to detect the senescence anticipation when visible symptoms already spread. These results were confirmed by physiological parameters measured in field (Fv/Fm, NPQ and ΔF/Fm').
Panigada, C., Rossini, M., Meroni, M., Marzuoli, R., Gerosa, G., Colombo, R. (2009). Indicators of ozone effects on Fagus sylvatica L. by means of spectroradiometric measurements. RIVISTA ITALIANA DI TELERILEVAMENTO, 41(2), 3-20.
Indicators of ozone effects on Fagus sylvatica L. by means of spectroradiometric measurements
PANIGADA, CINZIA;ROSSINI, MICOL;MERONI, MICHELE;COLOMBO, ROBERTO
2009
Abstract
In this paper optical indices calculated from leaf reflectance measurements, acquired with a high resolution spectroradiometer, were investigated to monitor O3 stress on Fagus sylvatica L. from the strain phase to the damage phase when visible symptoms occur (e.g. chlorosis, leaf browning). The CI (Chlorophyll Index) was the most sensible index to a wide range of chlorophyll (Chl) concentrations (R2=0.93), the simple ratio R695/R740 (Ctr2) was the most correlated to carotenoids/chlorophyll (Car/Chl) ratio (R2=0.65), while YI (Yellowness Index) was sensible to Car/Chl ratio and to low Chl values but tends to saturate at moderate to high Chl concentrations. PRI (Photochemical Reflectance Index) was correlated with the physiological parameters NPQ (Non Photochemical Quenching) and ΔF/Fm' confirming this index is a good indicator of photosynthetic efficiency. Results from this experiment showed that CI, Ctr2 and PRI were reliable indices of O3 effects on Fagus sylvatica L. before visible symptoms occurred, while YI was able to detect the senescence anticipation when visible symptoms already spread. These results were confirmed by physiological parameters measured in field (Fv/Fm, NPQ and ΔF/Fm').I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.