Growth and carotenogenesis in Rhodosporidium diobovatum IMB Y-5023: Effects of culture medium and illumination intensity

Abstract

The oleaginous yeast Rhodosporidium diobovatum is a poorly described producer of carotenoids and may be of interest in biotechnology. This study investigated the effects of culture medium and illumination on effective carotenoid production by R. diobovatum IMB Y-5023. Yeast was cultured on carrot, bran extract, and modified YM medium at illuminations in the 0–5,000 lx range. Biomass, total carotenoids, and their profile were assessed after cultivation. In order to samples comparison, cluster analysis (CA) and principle component analysis (PCA) were used to visualize the relationships between the variables and samples.Results show that it is not illumination, but culture medium that is the main factor determining the quantity and proportions of carotenoids produced by R. diobovatum IMB Y-5023. The yeast grew and produced pigments throughout the tested range of illumination intensity. The modified YM medium was optimal for carotenogenesis. In cultures on that medium, the highest carotenoid yields of 24.98 mg g⁻¹ DCW and 77 mg L⁻¹ were recorded. It was found that this yeast is capable of assimilating oligosaccharides and can grow and produce carotenoids in low-glucose media containing DP3 and DP4. Moreover R. diobovatum IMB Y-5023 produced lycopene as the main pigment independently of the culture conditions.