Growth of Dunaliella in "Ideal" Conditions Retains Annual Variability of Biochemical Features

Abstract

In this work we investigated the annual dynamics of the biomass accumulation of microalgae Dunaliella viridis, its content of nucleic acids, proteins, and triacylglycerols at accumulative cultivation while maintaining the culture at "ideal constant conditions throughout the year in order to eliminate the high variability of these parameters, which occur in conventional culture conditions. The cultivation of D. viridis in constant conditions throughout the year had not eliminated the rhythmic nature of the biomass accumulation and pronounced variability of its composition. The variability has flicker noise structure with a period of about 4 months. This variability was not related with the seasons of the year, but in some cases coincided well with the dynamics of solar activity, in particular with the change of the corpuscular and electromagnetic radiation. Several types of interactions between biological indicators and solar activity were revealed: direct, inverse and U-shaped one. It was hypothesized the variably dominant factors explaining the diversity of responses to solar activity, which is based on a hierarchical organization of water-molecular structured network of cell.