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.
Stomatal ozone uptake, determined with the Jarvis' approach, was related to photosynthetic efficiency assessed by chlorophyll fluorescence and reflectance measurements in open-top chamber experiments on Phaseolus vulgaris. The effects of O(3) exposure were also evaluated in terms of visible and microscopical leaf injury and plant productivity. Results showed that microscopical leaf symptoms, assessed as cell death and H(2)O(2) accumulation, preceded by 3-4 days the appearance of visible symptoms. An effective dose of ozone stomatal flux for visible leaf damages was found around 1.33 mmol O(3) m(-2). Significant linear dose-response relationships were obtained between accumulated fluxes and optical indices (PRI, NDI, DeltaF/F'(m)). The negative effects on photosynthesis 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, highlight the potentiality of reflectance measurements for the early detection of ozone stress.
Gerosa
Giacomo
G
Department of Mathematics and Physics, Università Cattolica del Sacro Cuore, via dei Musei 41, 20125 Brescia, Italy.
Marzuoli
Riccardo
R
Rossini
Micol
M
Panigada
Cinzia
C
Meroni
Michele
M
Colombo
Roberto
R
Faoro
Franco
F
Iriti
Marcello
M
D000393:Air Pollutants / Q000633:toxicity*; D018533:Biomass; D018556:Crops, Agricultural; D004305:Dose-Response Relationship, Drug; D004463:Ecology / Q000379:methods; D005060:Europe; D010083:Oxidants, Photochemical / Q000633:toxicity*; D010126:Ozone / Q000633:toxicity*; D027805:Phaseolus / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects / Q000254:growth & development; D054046:Plant Stomata / Q000378:metabolism; D018570:Risk Assessment / Q000379:methods; D012639:Seeds
D000393:Air Pollutants; D010083:Oxidants, Photochemical; D010126:Ozone