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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Cytotoxic and genotoxic assessment of surface water from So Paulo State, Brazil, during the rainy and dry seasons

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Author(s):
Salles, Fernanda Junqueira [1] ; Barbosa de Toledo, Maria Cecilia [2] ; Gobbo Cesar, Ana Cristina [2, 3] ; Ferreira, Gabriel Martins [3] ; Barberio, Agnes [2]
Total Authors: 5
Affiliation:
[1] Univ Taubate, Dept Biol, BR-12030180 Taubate, SP - Brazil
[2] Univ Taubate, Inst Biosci, Dept Biol, BR-12030180 Taubate, SP - Brazil
[3] Fed Inst Educ Sci & Technol Sao Paulo, BR-12929600 Braganca Paulista, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ECOTOXICOLOGY; v. 25, n. 4, p. 633-645, MAY 2016.
Web of Science Citations: 5
Abstract

The aim of this study was to determine if the cytotoxic and genotoxic responses of Allium cepa are effective biomarkers of harmful effects caused by polluted river water and if changes in the responses reflect seasonality in the harmful effects. Samples were collected in the dry season (August 2011 and 2012) and rainy season (February 2012 and 2013) at sampling points on the Jaguari River and the Ribeiro Lavap,s, in Brazil. Allium cepa bulbs were exposed to the samples, to positive controls (15 A mu g/L methyl methanesulfonate), and to negative controls (tap water). Three root tips from each bulb were then stained using the Feulgen reaction, then the micronucleus frequency, the mitotic index, and mitotic anomalies were measured. The total number of anomalies (stickiness, c-mitosis, multipolarity, chromosome bridges, and unidentified anomalies) in the rainy season (8.61 +/- A 3.65) and dry season (7.07 +/- A 2.96) were significantly different (U = 11.31, p = 0.04). Toxicity, indicated by the formation of micronuclei and the mitotic index, was higher in the February 2012 samples than in the August 2012 samples. The mean manganese concentration (0.13 mg/L) in the rainy season samples was higher than the maximum concentration permitted by the Brazilian National Environmental Council (< 0.1 mg/L) and the manganese concentrations positively correlated with chromosomal aberration induction (p = 0.01, r = 0.69). In conclusion, the rainy season samples were more toxic than the dry season samples. This was probably related to rain water carrying compounds with potentially negative impacts into the rivers. These findings highlight the importance of biomonitoring studies and of treating wastewater in urban areas. (AU)

FAPESP's process: 15/21253-0 - Evaluation of the presence of potentially toxic elements arising from jewelry industries in the sanitary waste waters collection system in Limeira - SP
Grantee:Fernanda Junqueira Salles
Support Opportunities: Scholarships in Brazil - Master