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Gas exchange, antioxidants and foliar injuries in saplings of a tropical woody species exposed to ozone

Pina, Juliana M. ; Moraes, Regina M.

Ecotoxicology and environmental safety, 2010-05, Vol.73 (4), p.685-691 [Periódico revisado por pares]

Netherlands: Elsevier Inc

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Título:
Gas exchange, antioxidants and foliar injuries in saplings of a tropical woody species exposed to ozone
Autor: Pina, Juliana M. ; Moraes, Regina M.
Assuntos: Air Pollutants - analysis ; Air Pollutants - toxicity ; Antioxidants ; Antioxidants - analysis ; Antioxidants - metabolism ; Ascorbic Acid - analysis ; Ascorbic Acid - metabolism ; Brazil ; Enzymes ; Exposure ; Foliar injury ; Gas exchange ; Injuries ; Leaves ; Ozone ; Ozone - toxicity ; Plant Leaves - drug effects ; Plant Leaves - metabolism ; Psidium - drug effects ; Psidium - metabolism ; Psidium guajava ; Psidium guajava “Paluma” ; Seasons ; Sod ; Stress concentration ; Superoxide dismutase ; Superoxide Dismutase - analysis ; Superoxide Dismutase - metabolism ; Tropical tree
É parte de: Ecotoxicology and environmental safety, 2010-05, Vol.73 (4), p.685-691
Notas: ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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Descrição: Ozone (O 3) reaches phytotoxical concentrations in the tropics, but the sensitivity of tropical plant species to O 3 remains unknown. Visible foliar injuries, carbon assimilation ( A sat), stomatal conductance, superoxide dismutase enzyme (SOD) activity and ascorbic acid concentration (AA) were evaluated in different-aged leaves of Psidium guajava ‘Paluma’ saplings. We hypothesized that the old leaves are less capable of combating the stress induced by O 3 and hence exhibit more severe leaf injuries. Three O 3 exposure experiments were performed with ‘Paluma’ saplings in sites with high O 3 concentration and also under filtered air conditions. The exposure experiments corresponding to the seasons spring/2006, summer and autumn/2007. The decrease of A sat was greater in old leaves of saplings exposed to O 3, except in the second experiment, when the AA concentrations were more pronounced than in the other experiments. In second experiment, O 3 uptake was similar to that of the first experiment, but the injuries were less severe, probably due to the high AA concentrations. It was not possible to identify a pattern of superoxide dismutase enzyme (SOD) activity due to the high variability in the results from O 3 exposed and reference saplings. O 3 uptake/ A sat was higher in leaves exhibiting greater injury, suggesting that decrease in A sat may have been the main feature associated with the visible foliar symptons.
Editor: Netherlands: Elsevier Inc
Idioma: Inglês

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Gas exchange, antioxidants and foliar injuries in saplings of a tropical woody species exposed to ozone

Pina, Juliana M. ; Moraes, Regina M.

Netherlands: Elsevier Inc

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