خيارات البحث
النتائج 1 - 4 من 4
Size-mediated foliar response to ozone in black cherry trees
1996
Fredericksen, T.S. | Skelly, J.M. | Steiner, K.C. | Kolb, T.E. | Kouterick, K.B. (Environmental Resources Research Institute, 220 Forest Resources Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802 (USA))
Chronic ozone exposure alters the growth of leaves, stems and roots of hybrid Populus
1994
Woodbury, P.B. | Laurence, J.A. | Hudler, G.W. (Boyce Thompson Institute for Plant Research, Tower Road, Ithaca, New York 14853-1801 (USA))
Acidic deposition and its effects on the forests of Nordic Europe
1986
Andersson, F. (Swedish Univ. of Agricultural Sciences, Uppsala (Sweden). Dept. of Ecology and Environmental Research)
Clusia hilariana and Eugenia uniflora as bioindicators of atmospheric pollutants emitted by an iron pelletizing factory in Brazil
2017
da Silva, Luzimar Campos | de Araújo, Talita Oliveira | Siqueira-Silva, Advanio Inácio | Pereira, Tiago Augusto Rodrigues | Castro, Letícia Nalon | Silva, Eduardo Chagas | Oliva, Marco Antonio | Azevedo, Aristéa Alves
The objectives of this work were to evaluate if the pollution emitted by the pelletizing factory causes visual symptoms and/or anatomical changes in exposed Eugenia uniflora and Clusia hilariana, in active biomonitoring, at different distances from a pelletizing factory. We characterize the symptomatology, anatomical, and histochemistry alterations induced in the two species. There was no difference in the symptomatology in relation to the different distances of the emitting source. The foliar symptoms found in C. hilariana were chlorosis, necrosis, and foliar abscission and, in E. uniflora, were observed necrosis punctuais, purple spots in the leaves, and increase in the emission of new leaves completely purplish. The two species presented formation of a cicatrization tissue. E. uniflora presented reduction in the thickness of leaf. In C. hilariana, it was visualized hyperplasia of the cells and the adaxial epidermis did not appear collapsed due to thick cuticle and cuticular flanges. Leaves of C. hilariana showed positive staining for iron, protein, starch, and phenolic compounds. E. uniflora showed positive staining for total phenolic compounds and starch. Micromorphologically, there was accumulation of particulate matter on the leaf surface, obstruction of the stomata, and scaling of the epicuticular wax in both species. It was concluded that the visual and anatomical symptoms were efficient in the diagnosis of the stress factor. C. hilariana and E. uniflora showed to be good bioindicators of the atmospheric pollutants emitted by the pelletizing factory.
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