Four species of typical freshwater algae--Euglena gracilis, Chlamydomonas reinhardtii, Navicula pelliculosa and Synechococcus leopoliensis were selected as the experiment materials. Effects of nitrobenzene on the growth and chlorophyll a content of the algae, the biodegradation and bioaccumulation of nitrobenzene, and the response of antioxidant enzymes to nitrobenzene were investigated, in order to reveal the resistant mechanism against nitrobenzene in the algae. The results indicated that the growth and chlorophyll a in the four sepecies of a...