Screening of Symbiotic Bacteria for Biodiesel Production in Algae Growth
Abstract
A novel symbiotic bacterial strain was isolated from the algae culture and further analyzed for sequence identification to determine the nature of the species. In this study, 3- to 4-month-old algae were cultured under nonaxenic conditions. Samples were taken to determine the presence of cross contamination, such as bacteria and other species, in the culture system. Microscopic analysis confirmed the presence of C. pyrenoidosa and S. abundans in the culture system. Additionally, bacterial identification revealed that stable colonies survived in the culture system. Several purification of two isolated pure colonies were carried out, and growth curves were plotted for the isolated colonies (white and yellow colonies), which had maximum absorbance values of 0.467 and 0.154, respectively, at 660 nm. Moreover, the isolated bacterial colonies were cocultured with pure axenic cultures of C. pyrenoidosa and S. abundans. Studies have shown that yellow colonies support the growth of algae. Hence, isolated and purified yellow colonies were subjected to morphological, biochemical, 16S rRNA sequencing and FAME analyses via gas chromatography. This analysis confirmed that the isolated symbiotic bacterium was Stenotrophomonas maltophilia. The consensus sequence was deposited in the NCBI GenBank KX768757.
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