Effects of Iron Valence on the Growth, Photosynthesis, and Fatty Acid Composition of Phaeodactylum tricornutum

Iron is a limiting factor that controls the phytoplankton biomass of ocean and plays an important role in lipid production microalgae. Elucidating effects different iron valences on microalgae helpful for their commercial production. We investigated growth, photosynthesis, fatty acid profile model diatom Phaeodactylum tricornutum cultured with depleted Fe, Fe2+, Fe2+/Fe3+, Fe3+. Samples were taken every 24 h 8 days, cell density, photosynthetic pigment content, chlorophyll fluorescence, total composition analyzed. The densities Fe2+ Fe2+/Fe3+ groups significantly higher than those control Fe3+ (p < 0.05). They 1.26 times 1.23 Fe-depleted group. contents c group fluorescence results show enhanced photosynthesis P. to greater extent On eighth day harvest, Fv/Fm Y(II) 0.672 0.476, respectively, being 1.10 1.19 1.15 1.33 group, respectively. Compared levels saturated acids 0.05) at 21.36 ± 1.24% 21.20 0.13%, polyunsaturated lower 29.82 2.75%. Our exhibited physiological plasticity, including changes activities shifts composition, response was more beneficial this species These findings are applicable acids.