Microalgae have great potential as biofactories for producing a wide variety of valuable products. Under stress conditions, it is well-known that microalgae accumulate various organic compounds. However, there is little information on the response of the diatom Chaetoceros muelleri to different nitrogen concentrations. In the present study, C. muelleri was grown in medium containing different concentrations of nitrogen (NaNO3; f: 1.76 mM, f/4: 0.44 mM, f/10: 0.18 mM, and 2f: 3.53 mM) and their proximal composition, fatty acid profile, and gene expression (AMT1, PTD9, GltD, DGAT2, and NRT2) compared. The results showed no significant differences in biomass content among nitrogen treatments. Treatment f/10 significantly increased accumulation of lipids and carbohydrates but lowered the concentration of proteins. This treatment also produced shorter-chain fatty acids and a low percentage of polyunsaturated fatty acids, demonstrating the potential of this medium for growing microalgae with a suitable fatty acid profile for biodiesel production. Furthermore, DGAT2 and NRT2 expression was highest at lower nitrogen concentrations, suggesting these genes could be important for modulating lipid biosynthesis in response to nitrogen limitation.
Bibliographical noteFunding Information:
The present research was funded by the National Council of Science and Technology (Mexico)-Consejo Nacional de Ciencia y Tecnología (CONACyT project Nº 000000000257155). The authors thank Dr. Juan Carlos Ramírez-Suárez (Laboratorio de Productos Pesqueros. Centro de Investigación en Alimentación y Desarrollo, A.C [CIAD]) for allowing the fatty acid analysis in their facilities. D. de Jesus-Campos was also funded by a Master Fellowship from CONACyT (Nº 638640 ).
The present research was funded by the National Council of Science and Technology (Mexico)-Consejo Nacional de Ciencia y Tecnolog?a (CONACyT project N? 000000000257155). The authors thank Dr. Juan Carlos Ram?rez-Su?rez (Laboratorio de Productos Pesqueros. Centro de Investigaci?n en Alimentaci?n y Desarrollo, A.C [CIAD]) for allowing the fatty acid analysis in their facilities. D. de Jesus-Campos was also funded by a Master Fellowship from CONACyT (N? 638640).
© 2020 The Authors
- Biochemical composition
- Chaetoceros muelleri
- Fatty acid methyl esters
- Gene expression
- Nitrogen stress