AI Article Synopsis
- - Ozone (O3) is a harmful pollutant that causes oxidative stress in sensitive plants, leading to visible damage such as necrosis and stippling on leaves, particularly noticed on the leaf surface.
- - A controlled experiment assessed the sensitivity of three tropical plant species: Piptadenia gonoachanta, Astronium graveolens, and Croton floribundus, revealing common oxidative stress responses, including cell death and chemical changes in their tissues.
- - The findings showed that the reactions of these Brazilian species to ozone are similar to those in temperate plants, suggesting that specific microscopic changes can help identify ozone damage in future ecological studies.
Article Abstract
Ozone (O3) is a toxic secondary pollutant able to cause an intense oxidative stress that induces visual symptoms on sensitive plant species. Controlled fumigation experiment was conducted with the aim to verify the O3 sensibility of three tropical species: Piptadenia gonoachanta (Mart.) Macbr. (Fabaceae), Astronium graveolens Jacq. (Anacardiaceae), and Croton floribundus Spreng. (Euphorbiaceae). The microscopical features involved in the oxidative stress were recognized based on specific histochemical analysis. The three species showed visual symptoms, characterized as necrosis and stippling between the veins, mostly visible on the adaxial leaf surface. All the studied species presented hypersensitive-like response (HR-like), and peroxide hydrogen accumulation (H2O2) followed by cell death and proanthocyanidin oxidation in P. gonoachanta and A. graveolens. In P. gonoachanta, a decrease in chlorophyll autofluorescence occurred on symptomatic tissues, and in A. graveolens and C. floribundus, a polyphenol compound accumulation occurred. The responses of Brazilian native species were similar to those described for sensitive species from temperate climate, and microscopical markers may be useful for the detection of ozone symptoms in future studies in the field.
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| http://dx.doi.org/10.1007/s11356-013-2326-1 | DOI Listing |
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