Fig. 4.
Chlorophyll a content in Anabaena PCC 7120 cells cultured for 24 h in BG11 media (control), or BG11 containing 20 μg mL−1 SDS, 100 mM NaCl, or 200 mM PEG in the absence or presence of 10 or 30 μM boron. The different letters indicate significant differences (P ⩽ 0.05). Sample size n = 20 (5 replicates from 4 independent experiments).