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EnglishTwo bean cultivars with different ozone-sensitivity, i.e. the O3-sensitive Cannellino and the O3-tolerant Top Crop, were exposed to acute O3-stress with the aim of evaluating physiological and biochemical traits responsible for O3-tolerance. The cultivars differed in their constitutive ability to prevent and counter O3-induced oxidative damage. The ability to dissipate excess-energy, via regulated and unregulated nonphotochemical quenching mechanisms (NPQ, NO) was constitutively greater in Top Crop than in Cannellino, and allowed the O3-tolerant cultivar to compensate light-induced declines in PSII and preserve photosystem II from excitation-energy to a superior degree than the O3-sensitive one. The inevitable generation of reactive oxygen species was countered to a significantly smaller extent in the O3-sensitive cultivar, because of constitutively lower activities of superoxide dismutase and catalase than the O3-tolerant cultivar. Indeed, Cannellino underwent an early accumulation of H2O2 and an almost complete disruption of cell structure and irreversible damages in the photosynthetic apparatus.
| Autori interni: | |
| Autori: | GUIDI L; DEGLINNOCENTI E; GIORDANO C; BIRICOLTI S; TATTINI M |
| Titolo: | Ozone tolerance in Phaseolus vulgaris depends on more than one mechanism |
| Anno del prodotto: | 2010 |
| Digital Object Identifier (DOI): | 10.1016/j.envpol.2010.06.037 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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http://hdl.handle.net/11568/136159
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