tailieunhanh - The genotoxic potential of two heavy metals in inbred lines of maize (Zea mays L.)
The genotoxic effects of 2 heavy metals (mercury chloride and cadmium chloride) on the gametic cells of 6 inbred lines of maize were tested in terms of cytological abnormalities. Meiosis was normal under control conditions. During the treatments with mercury and cadmium there was a concentration-dependent increase in meiotic abnormalities in all the inbred lines. | Research Article Turk J Bot 34 (2010) 39-46 © TÜBİTAK doi: The genotoxic potential of two heavy metals in inbred lines of maize (Zea mays L.) Prashant KUMAR RAI1,*, Girjesh KUMAR2 1 Plant Genetics Laboratory, Department of Botany, University of Allahabad, Allahabad-211002, . - INDIA 2Department of Botany, University of Allahabad, Allahabad-211002, . - INDIA Received: Accepted: Abstract: The genotoxic effects of 2 heavy metals (mercury chloride and cadmium chloride) on the gametic cells of 6 inbred lines of maize were tested in terms of cytological abnormalities. Meiosis was normal under control conditions. During the treatments with mercury and cadmium there was a concentration-dependent increase in meiotic abnormalities in all the inbred lines. A wide spectrum of chromosomal aberrations in the treated sets was stickiness, followed by laggards, bridges, scattering, precocious movement, fragments, etc. Maximum chromosomal anomalies were observed in inbred line CM-142 in both the treatment sets of heavy metals. Compared to CdCl2, HgCl2 induced more chromosomal damage in all the inbreds. Of the 6 inbreds examined during the present investigation, CM-138 was the most tolerant to both heavy metals, while CM-142 was the least resistant. Key words: Zea mays, inbreds, mercury, cadmium, chromosomal anomalies Introduction Heavy metal contamination of soils has markedly increased in the past few decades. Many factors, such as metal-enriched parent materials, mining or industrial activities, non-point sources of metals, especially automotive emission, and use of metalenriched materials, including chemical fertilizer, farm manures, sewage sludge, and wastewater irrigation, can contribute to this contamination (Freedman & Hutchinson, 1981; Herawati, 2000; Brun, 2001). Increased pollution due to the release of genotoxic chemicals and increased radiation levels have affected the ecosystem and the health of organisms, .
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