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. 2012 Nov 7;7(11):e49037. doi: 10.1371/journal.pone.0049037

Figure 1. Impact of m-dcps toxicity on mixotrophic Scenedesmus obliquus cultures grown in the presence of 0.15 mM of m-dcps.

Figure 1

(A) Growth kinetic of cultures treated with different m-dcps [in terms of µL PCV (mL culture)−1]. (black diamond) control, (black square) 2,3-dcp, (grey triangle) 2,5-dcp and (discontinuous line) 3,4-dcp. (B) Photosynthetic parameters after the first incubation day with various m-dcps [(black diamond) control, (black square) 2,3-dcp, (grey triangle) 2,5-dcp and (discontinuous line) 3,4-dcp]. Fv/Fm: photosynthetic efficiency (STDEV: 0.001–0.012), ABS/RC: functional antenna size (STDEV: 0.5–1.5), RC/CSo: density of active reactions centers (STDEV: 1.5–5), DIo/RC: dissipation energy per active reaction center (STDEV: 0.5–1.1). (C) Maximal photosynthetic (dark grey) and respiratory (light grey) rate of Scenedesmus cultures after the first incubation day with different m-dcps. (D) Scanning electron microscopy of Scenedesmus cells from cultures treated with different m-dcps. D1: control, D2∶2,3-dcp, D3∶2,5-dcp and D4∶3,4-dcp.