Cytogenetic effects of cadmium accumulation on water hyacinth (Eichhornia crassipes)
Cadmium was bioassayed to observe cytogenetic effects in the water hyacinth (Eichhornia crassipes). Plants were exposed for 96 hr to freshwater containing 0.01, 0.05, 0.10, 1, 5, and 10 mg/liter of cadmium. Metal concentrations in tissues were determined by atomic absorption spectrophotometry. The highest level was found in roots, thus root-tip cells were used for cytogenetic studies; after 24 hr of exposure, micronuclei, c-mitotic effects, and pycnosis were detected and after 48 hr polyploidy was observed. A linear relationship between frequencies of micronuclei and cadmium concentrations was found; at 1, 5, and 10 mg/liter micronuclei numbers were always the lowest. The inhibition of cell proliferation, shown by the low mitotic index, was proportional to the concentration and time of exposure. From the results presented in this paper it may be concluded that water hyacinth is a good sensor, due to its fast rate of metal accumulation, which allows an easy way to determine the presence of potential mutagenic compounds in water. 63 references.
- Research Organization:
- Universidad Nacional Autonoma de Mexico, Mexico City
- OSTI ID:
- 6722206
- Journal Information:
- Environ. Res.; (United States), Vol. 33:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CADMIUM
BIOLOGICAL EFFECTS
CELL PROLIFERATION
INHIBITION
ROOTS
BIOLOGICAL ACCUMULATION
ABSORPTION SPECTROSCOPY
BIOASSAY
BIOLOGICAL INDICATORS
CONCENTRATION RATIO
DOSE-RESPONSE RELATIONSHIPS
PLOIDY
SPECTROPHOTOMETRY
TIME DEPENDENCE
TISSUE DISTRIBUTION
WATER HYACINTHS
AQUATIC ORGANISMS
DISTRIBUTION
ELEMENTS
METALS
PLANTS
SPECTROSCOPY
560303* - Chemicals Metabolism & Toxicology- Plants- (-1987)