Structural responses of Ipomoea nil (L.) Roth `Scarlet O'Hara' (Convolvulaceae) exposed to ozone

Autor(es)

Moura, Barbara Baesso ^[1] ; de Souza, Silvia Ribeiro ^[1] ; Alves, Edenise Segala ^[1]

Afiliação do(s) autor(es)

^[1] Inst Bot, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Acta Botanica Brasilica; v. 25, n. 1, p. 122-129, JAN-MAR 2011.
• Citações Web of Science: 10

Resumo

(Structural responses of Ipomoea nil (L.) Roth cv. `Scarlet O'Hara' (Convolvulaceae) exposed to ozone). Troposphere ozone (O(3)) is an important photochemical pollutant due to its high reactivity and phytotoxicity. Plants can show microscopic damage caused by this gas before the detection of visible symptoms. The present study aimed to improve our knowledge concerning the effects of O(3) on Ipomoea nil L. cv. Scarlet O'Hara leaves. Plants were exposed at a pollutant site in Sao Paulo city, with high levels of O(3), and fumigation with O(3) was also carried out. In plants exposed to the environment, without visible symptoms, hypersensitive response-like (HR-like) and protrusions in the cell walls was observed, indicating oxidative processes; in leaves with visible symptoms, there is epidermis breakdown and the palisade and spongy parenchyma collapse. Fumigation confirmed that microscopic damage occurring in the plants exposed to the environment was linked to the symptoms caused by O(3). These results demonstrate that Ipomoea nil responds to stress induced by O(3) with specific structural changes that precede visible symptoms. (AU)

• Processo FAPESP: 02/04751-6 - Avaliação das respostas de bioindicadores vegetais a diferentes condições da química atmosférica envolvidas no smog fotoquímico: um estudo em câmara controlada simulando a poluição urbana
• Beneficiário: Silvia Ribeiro de Souza
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 05/51169-9 - Respostas fisiológicas, antioxidativas e estruturais a fatores ambientais em plantas bioindicadoras sensíveis a compostos do smog fotoquímico
• Beneficiário: Marisa Domingos
• Modalidade de apoio: Auxílio à Pesquisa - Regular