Open-Top Chamber (OTC) experiments on Phaseolus vulgaris were conducted in summer 2006, to study the ozone effects on visible and invisible leaf injury, photosynthetic efficiency and plant productivity. A Jarvisian stomatal conductance model was drawn up and parameterized allowing the calculation of stomatal ozone uptake in filtered and non filtered OTCs. A multidisciplinary approach was employed to evaluate the ozone effects on plants including: chlorophyll fluorescence and reflectance measurements, histo-cytochemical analyses and yield analysis. The results showed that microscopical leaf symptoms preceded by 3-4 days the appearance of visible symptoms and were strictly correlated with ozone stomatal uptake Stomatal flux critical level for visible leaf injury onset was found around 1.33 mmol O3 m-2. Significant linear dose-response relationships were obtained between cumulative ozone stomatal flux and optical indices (i.e. PRI, NDI and ΔF/Fm ). The negative ozone effects on photosynthesis inevitably reduced plant productivity, affecting the number of pods and seeds, but not seed weight. These results, besides contributing to the development of a flux-based ozone risk assessment for crops in Europe point out the great potentiality of spectral reflectance in evaluating photosynthetic activity reduction in crops.

Gerosa, G. A., Marzuoli, R., Rossini, M., Panigada, C., Meroni, M., Colombo, R., Faoro, F., Iriti, M., A flux-based assessment of the effects of ozone on foliar injury, photosynthesis, and yield of bean (Phaseolus vulgaris L. cv. Borlotto Nano Lingua di Fuoco) in open-top chambers, <<ENVIRONMENTAL POLLUTION>>, 2009; 157 (5): 1727-1736. [doi:10.1016/j.envpol.2008.06.028] [http://hdl.handle.net/10807/29766]

A flux-based assessment of the effects of ozone on foliar injury, photosynthesis, and yield of bean (Phaseolus vulgaris L. cv. Borlotto Nano Lingua di Fuoco) in open-top chambers

Gerosa, Giacomo Alessandro;Marzuoli, Riccardo;Colombo, Roberto;
2009

Abstract

Open-Top Chamber (OTC) experiments on Phaseolus vulgaris were conducted in summer 2006, to study the ozone effects on visible and invisible leaf injury, photosynthetic efficiency and plant productivity. A Jarvisian stomatal conductance model was drawn up and parameterized allowing the calculation of stomatal ozone uptake in filtered and non filtered OTCs. A multidisciplinary approach was employed to evaluate the ozone effects on plants including: chlorophyll fluorescence and reflectance measurements, histo-cytochemical analyses and yield analysis. The results showed that microscopical leaf symptoms preceded by 3-4 days the appearance of visible symptoms and were strictly correlated with ozone stomatal uptake Stomatal flux critical level for visible leaf injury onset was found around 1.33 mmol O3 m-2. Significant linear dose-response relationships were obtained between cumulative ozone stomatal flux and optical indices (i.e. PRI, NDI and ΔF/Fm ). The negative ozone effects on photosynthesis inevitably reduced plant productivity, affecting the number of pods and seeds, but not seed weight. These results, besides contributing to the development of a flux-based ozone risk assessment for crops in Europe point out the great potentiality of spectral reflectance in evaluating photosynthetic activity reduction in crops.
eng
Gerosa, G. A., Marzuoli, R., Rossini, M., Panigada, C., Meroni, M., Colombo, R., Faoro, F., Iriti, M., A flux-based assessment of the effects of ozone on foliar injury, photosynthesis, and yield of bean (Phaseolus vulgaris L. cv. Borlotto Nano Lingua di Fuoco) in open-top chambers, <>, 2009; 157 (5): 1727-1736. [doi:10.1016/j.envpol.2008.06.028] [http://hdl.handle.net/10807/29766]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/29766
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