Comparative Characterization of Two Arthrospira Strains Isolated from Full-scale Raceway Pond
Temperature is an important factor affecting biomass productivity in large-scale cultivation of Arthrospira.To improve Arthrospira production,it is crucial to screen strains with high productivity and excellent temperature-tolerance ability.Two strains Arthrospira sp.DICP-D (D) and Arthrospira sp.DICP-F (F) were isolated and identified from full-scale Arthrospira cultivation raceway pond.Although strain D and strain F displayed significant difference in morphology,they shared closest phylogenetic relationship among the existing Arthrospira strains with accessible 16S rRNA gene information.Under normal conditions,strain D and strain F harbor almost the same biomass compositions,and they also accumulated identical carbohydrate content in cell under nitrogen stress or low temperature stress conditions.However,the biomass productivity in strain D was 33％ to 230％ higher than that in strain F under the same cultivation conditions tested.Strain D showed 1.1 times better tolerance ability towards high temperature stress than strain F.The biomass productivity in strain D under 41℃ and 15℃ could be maintained at 73％ and 61％,respectively,of that under normal temperature,demonstrating that strain D had good tolerance ability towards temperature stress.Strain D held more efficient photoprotection mechanism than strain F did,which endowed it better ability to acclimate to stressful conditions.The excellent biomass productivity and stress tolerance ability in strain D could make it applicable with great notential in outdoor large-scale Arthrospira cultivation.
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万方数据
维普
