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Relative gene expression in response to different nitrate concentrations. The expressions of three genes Δ9FAD (a), Δ12FAD (b) and Δ15FAD (c) in three different growth phases lag (lag), logarithmic (log) and stationary phase (S) were detected by real-time PCR. Algal cells were collected in lag (day 2), logarithmic (day 7) and stationary (day 12) phases under the nitrate concentrations of 0 and 1.5 g l−1. Bars represent means and standard deviation (n = 3).
