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- The impact of bacteria-microalgae co-cultivation on the growth and productivity of Tisochrysis luteaPublication . Simões, Beatriz; Varela, JoãoNowadays, the lack of essential resources, such as food and water, has been the cause of worldwide concern. Therefore, new alternatives are being increasingly researched to tackle these global demands. Microalgae are a possible alternative to obtain compounds (e.g., proteins and fatty acids) that can be applied to several economic sectors, such as the food, feed or pharmaceutical industries. In nature, these eukaryotes share their habitat with various microorganisms. With them, microalgae can establish a wide variety of interactions, ranging from parasitism to mutualistic relations, which often involve the exchange of compounds, such as organic matter and vitamins, required for the development and survival of the involved organisms. However, despite microalgae potential for industrial purposes, the impact of their naturally occurring bacteriome in the cultures is still overlooked or viewed negatively since bacteria are often considered as undesired contaminants. In this thesis, 145 bacteria were identified in the industrial cultures of the microalga Tisochrysis lutea, a species produced primarily for the aquaculture industry, due to the high content of polyunsaturated fatty acids (PUFA) and pigments. Of those, 7 strains showed potential to improve the productivity or biochemical composition of T. lutea upon co-culture with this microalga. Simple “tailor-made” bacterial mixes were then designed to optimize the production of this haptophyte. Among the 21 combinations assayed, 6 were associated with a significant productivity increase, ranging from 30 to 58%. In addition, 5 combinations were correlated with elevated concentrations of methylcobalamin and 3 with enhanced concentrations of some PUFA (16:2n-6, 18:3n-3α, and 22:5n-3). Through this work, we enhanced the biomass production and productivity of bioactive compounds in T. lutea at the laboratory scale by adding custom bacterial blends to the already xenic cultures of this microalga. This represents a significant step to improve the industrial production of this haptophyte with important biotechnological applications.