Ultrastructural changes of radish leaf exposed to cadmium |
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| Affiliation: | 1. Laboratório de Ciências Ambientais, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense, 2000 UENF/CBB/LCA sala 203, Campos dos Goytacazes CEP 28013-602, RJ, Brazil;2. Laboratório de Biologia Celular e Tecidual, Centro de Biociências e Biotecnologia, Universidade Estadual do Norte Fluminense, Campos dos Goytacazes CEP 28013-602, RJ, Brazil;3. Departamento de Genética, Escola Superior de Agricultura Luiz de Queiroz, Universidade de São Paulo, Piracicaba CEP 13418-900, SP, Brazil;1. Instituto de Biotecnología, Instituto Nacional de Tecnología Agropecuaria (IB-INTA), Hurlingham, Argentina;2. Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET, Buenos Aires, Argentina;1. School of Materials Science and Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Nangang District, Harbin 150001, China;2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;2. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | Cadmium (Cd2+) is one of the most toxic heavy metal pollutants in nature. Mesophyll cells from the leaf of radish seedlings exposed to 0.25 and 1.0 mM of CdCl2 during 24 h exhibited structural changes of chloroplasts, mitochondria and nuclei when compared to non-treated control plants. Chloroplasts from Cd2+-exposed samples exhibited changes in the organelle shape, an increase in the stroma volume and a deposition of electron-dense material in the double membrane. The changes in the chloroplast membranes were not very drastic, however and reorganization of the thylakoids and stroma was observed. In contrast, the breakdown of the nuclear envelope of the plant cells treated with Cd2+ was very clear. The accumulation of electron-dense granules was also observed in mitochondria. No alterations were observed in the vacuoles of radish seedlings grown at different Cd2+ concentrations for the periods tested. |
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