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| Effect of NO2--N on the physiology characteristics of Microcystis aeruginosa. |
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Abstract The growth and physiological change of Microcystis aeruginosa were studied under different initial NO2--N concentration, adopting the standard method of algal bioassay. Compared with BG11 (without NO2--N), M. aeruginosa grew well under low initial NO2--N concentration (1 and 10mg/L), however, the growth slowed down and even ceased under high initial NO2--N concentration (from 20 to 40mg/L). The nitrite reductase (NiR) activity and catalase (CAT) activity tended to increase from initial NO2--N concentration of 10 to 30mg/L. The content of chlorophyll a (Chl-a) and malondiadehyde (MDA) also showed an increase with initial NO2--N concentration increasing in the range of 20 to 30mg/L and 20 to 40mg/L respectively. The nitrate reductase (NR) activity was constant under initial NO2--N concentration (from 0 to 30mg/L). These observed phenomena indicated M. aeruginosa could maintain definite growth in initial NO2--N concentration rage of 10 to 30mg/L, due to the increase of Chl-a content and the enhancing of enzymic activity of NiR and CAT.
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Received: 08 January 2009
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