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A study was made of the role of various heavy metals (chromium, zinc, copper and cadmium) together with the effects of NaCl-salinity, PEG-mediated water stress and temperature on growth and superoxide dismutase (SOD) activity in hydrilla (Hydrilla verticillata L.). Almost all metals studied reduced growth but presented a modulatory effect at lower concentrations. NaCl-salinity, water stress and temperature treatments also reduced growth. SOD activity was inhibited by both chromium and zinc but increased by copper and cadmium. NaCl-salinity increased SOD activity while water stress decreased it. SOD showed thermostability with a higher activity being recorded at 45ºC. Estudaram-se os efeitos de alguns metais pesados (cromo, zinco, cobre e cádmio), da temperatura, da salinidade induzida por NaCl e do estresse hídrico induzido por PEG sobre o crescimento e a atividade da dismutase do superóxido (SOD) em Hydrilla verticillata L. Quase todos esses metais reduziram o crescimento, mas tiveram efeito modulador em baixas concentrações. Os tratamentos de salinidade induzida por NaCl, estresse hídrico e temperatura, também o reduziram. A atividade do SOD foi inibida por cromo e zinco, mas aumentada por cobre e cádmio. O estresse salino aumentou a atividade do SOD, enquanto o hídrico o diminuiu. O SOD mostrou-se termoestável, sendo a maior atividade atingida a 45ºC

Changes in growth and superoxide dismutase activity in Hydrilla verticillata L. under abiotic stress