Title: Cytogenetic Damage Induced by Cadmium in Rice(Oryza sativa L.)Root Tips
Abstract:Cadmium(Cd)is one of the most toxic pollutants in the soil, which can limit plant growth and crop productivity. In order to explore the cytogenetic damage induced by cadmium on rice(Oryza sativa L.)ro...Cadmium(Cd)is one of the most toxic pollutants in the soil, which can limit plant growth and crop productivity. In order to explore the cytogenetic damage induced by cadmium on rice(Oryza sativa L.)root tips cells, the root tips were treated with different concentrations of cadmium for 24 h, 48 h and 72 h, and the mitosis index, cell cycle, the frequency of micronucleus and chromosomal aberrations were determined. The results showed the mitotic index in root tip cells of rice seedlings were significantly decreased with the increase of Cd concentrations and treatment duration. Cadmium had the least effects on the metaphase cell ratios among four phases during the mitosis. The frequencies of micronucleus increased with the increase of Cd concentrations and treatment duration; However, beyond concentration of 75 μmol·L-1, cadmium restrained the frequencies of micronucleus. Moreover, high frequencies of chromosomal aberrations of root tip cells in rice seedlings were produced by Cd, and the chromosomal aberration frequencies were increased in treated time-response and dose-response manners. The results of the present study indicated that cadmium could inhibit the mitosis and damage the chromosomes of root meristematic cells of rice seedlings, suggesting that cadmium had clear cytogenetic toxic effects on plant cells.Read More
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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