Data/hora: 16/06/2024 09:31:53

Provedor de dados: | 52
País: | Brazil
Título: | Effects of simulated acid rain on leaf anatomy and micromorphology of Genipa americana L. (Rubiaceae)
Autores: | Sant'Anna-Santos,Bruno Francisco; Silva,Luzimar Campos da; Azevedo,Aristéa Alves; Aguiar,Rosane.
Data: | 2006-03-01
Ano: | 2006
Palavras-chave: | Genipa americana; Simulated acid rain; Leaf anatomy; Leaf micromorphology.
Resumo: | Experiments were conducted in order to characterize the injuries on leaf structure and micromorphology of G. americana and evaluate the degree of susceptibility of this species to simulated acid rain. Plants were exposed to acid rain (pH 3.0) for ten consecutive days. Control plants were submitted only to distilled water (pH 6.0). Leaf tissue was sampled and fixed for light and scanning electron microscopy. Necrotic interveinal spots on the leaf blade occurred. Epidermis and mesophyll cells collapse, hypertrophy of spongy parenchyma cells, accumulation of phenolic compounds and starch grains were observed in leaves exposed to acid rain. The micromorphological analysis showed, in necrotic areas, plasmolized guard cells and cuticle rupture. Epidermal and mesophyll cells alterations occurred before symptoms were visualized in the leaves. These results showed the importance of anatomical data for precocious diagnosis injury and to determine the sensitivity of G. americana to acid rain.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000300017
Editor: | Instituto de Tecnologia do Paraná - Tecpar
Relação: | 10.1590/S1516-89132006000300017
Formato: | text/html
Fonte: | Brazilian Archives of Biology and Technology  v.49 n.2 2006
Fonte: | info:eu-repo/semantics/openAccess