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4671557 
Journal Article 
Phytotoxicity and cytogenotoxicity of water and sediment of urban stream in bioassay with Lactuca sativa 
Rodrigues, L; Barbosa, S; Pazin, M; Maselli, B; Beijo, LA; Kummrow, F 
2013 
1 
Revista Brasileira de Engenharia Agrícola e Ambiental - Agriambi
ISSN: 1415-4366
EISSN: 1807-1929 
UNIV FEDERAL CAMPINA GRANDE 
CAMPINA GRANDE PB 
17 
10 
1099-1108 
WOS:000328275500012 
The aim of this study was to evaluate the spatial and temporal influence of the phytotoxicity and cytogenotoxicity of water and sediment of urban stream on the germination and initial growth of Lactuca sativa. Samples were collected from water and sediment at five sites of the Pantano Stream (Alfenas, Minas Gerais) during the period from October 2010 to July 2011. The concentrations of the metals Cd, Pb and Zn were quantified. Moreover, phytotoxicity and cytogenotoxicity were tested with samples of water and aqueous extracts of sediments. The evaluated end points were the germination rate, root length, fresh and dry weight, mitotic index and frequency of chromosomal abnormalities. Higher levels of Cd and Pb were verified in water samples collected during the rainy months. Water and sediment showed phytotoxic effect on germination, fresh weight and dry weight of Lactuca sativa. Root length was stimulated and only samples of water reduced the mitotic index. Significant temporal variation related to rainfall was observed only for phytotoxicity tests. 
lettuce; toxicity; seasonality