Effect of light quality and quantity on productivity and phycoerythrin concentration in the cryptophyte Rhodomonas sp.

Abstract The cryptophyte Rhodomonas sp . is a potential feed source for aquaculture live and resource phycoerythrin (PE) production. This research investigates the influence of light, both quality quantity, on biomass productivity, composition growth rate sp. incident light intensity used in experiments was 50 ?mol photons m ?2 s ?1 , irrespective colour cultivation took place lab-scale flat-panel photobioreactors turbidostat mode. highest productivity volumetric (0.20 g dry weight L day ), measured under continuous illumination, observed green conditions. Blue red illumination resulted lower productivities, 0.11 0.02 respectively. differences production are ascribed to increased absorption blue wavelength by phycoerythrin, chlorophyll carotenoids, causing higher photosynthetically usable radiation (PUR) from equal absorbed irradiance (PAR). Moreover, concentration (281.16 mg gDW ) stimulated illumination. Because photosystem II (PSII) absorbs poorly algae had induce more pigments order negate per unit pigment available photons. results this study indicate that can be initial produce and, at later stage, could implemented stimulate synthesis PE. Fourier-transform infrared spectroscopy (FTIR) analysis demonstrated significant difference between cells different quality, with contents proteins samples cultivated In comparison, carbohydrate were grown light.