Effects of trivalent and hexavalent chromium on root growth and cell division of Allium cepa
TLDR
The results showed that both trivalent and hexavalent chromium inhibit root growth and cause mitotic irregularities comprising c-mitosis, anaphase bridges, chromosome stickiness, and chromosome fragmentation and lagging.Abstract:
The effects of trivalent and hexavalent chromium on root growth, cell division and chromosome morphology of Allium cepa were studied. The concentrations used of chromium nitrate and potassium dichromate were 2 × 10-1, 2 × 10-2, 2 × 10-3, 2 × 10-4, 2 × 10-5, 2 × 10-6, and 2 × 10-7M. The results showed that both trivalent and hexavalent chromium inhibit root growth and cause mitotic irregularities comprising c-mitosis, anaphase bridges, chromosome stickiness, and chromosome fragmentation and lagging. When compared with chromium nitrate on the equimolar basis, potassium dichromate showed a stronger inhibitory and toxic effect on root growth and cell division, respectively. The possible mechanism of the Cr poisoning of root meristem cells of Allium cepa is also briefly discussed.read more
Citations
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Evaluation of the Allium anaphase-telophase test in relation to genotoxicity screening of industrial wastewater
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TL;DR: The Allium test is recommended for the screening of wastewater because it has a high sensitivity, is cheap, rapid, easy to handle, and because it can be used on wastewater without pretreatment of the sample.
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Determination of genotoxic effects of copper sulphate and cobalt chloride in Allium cepa root cells by chromosome aberration and comet assays.
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References
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The Allium test as a standard in environmental monitoring
TL;DR: The Allium test is a short-term test with many advantages: low cost, ease to handle, good chromosome conditions for the study of chromosome damage or disturbance of cell division including the evaluation of risks of aneuploidy.
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Calmodulin—an intracellular calcium receptor
Anthony R. Means,John R. Dedman +1 more
TL;DR: Calmodulin, a protein that binds calcium with high affinity and specificity, is structurally conserved and functionally preserved throughout the animal and plant kingdoms.
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Chromium occurrence and function in biological systems.
TL;DR: An extensive review of the biogeochemistry of chromium is presented, dealing with its occurrence in nature, chromium's interactions with proteins, nucleic acids, bacteria, yeasts and red blood cells, and the biochemical aspects of low-chromium states.
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Metabolism and possible health effects of aluminum.
TL;DR: A hypothetical model is presented for the metabolism of aluminum, based on documented direct observations of Al3+ and analogies from other ions, and it is proposed that an accumulation may take place at a subcellular level without any significant increase in the corresponding tissue concentration.