Phytohormones for enhanced biomass production of marine microalgae

Subramanian, A and Imelda, Joseph (2024) Phytohormones for enhanced biomass production of marine microalgae. Indian Journal of Geo Marine Sciences, 53 (3). pp. 119-125. ISSN 2582-6727

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Abstract

Microalgae, abundant in essential nutrients like vitamins, proteins, lipids, and pigments, hold immense potential for diverse applications spanning food, biofuels, pharmaceuticals, and environmental solutions. Present study focuses assessment of cell multiplication in microalgae Chlorella vulgaris, Nannochloropsis salina and Isochrysis galbana, widely used in aquaculture hatcheries with Indole Acetic Acid (IAA), Gibberellic Acid (GA), and zeatin at 1.0 mg/L, 0.1 mg/L, and 0.01 mg/L in 16 days culture period. The study results revealed that the microalgal biomass can be increased by inducing phytohormones at different concentrations. With zeatin, the cell count observed in C. vulgaris and N. salina was more than that in control at all three concentrations. For I. galbana, except in 1.0 mg/L, the cell count was higher than that in control. Chlorella vulgaris attained the maximum cell density at 0.1 mg/L of zeatin (2.5×105 cells/ml) and with GA, the cell count attained was highest at 0.01 mg/L (2.25×105 cells/ml). Nannochloropsis salina also showed higher cell count than the control at all three concentrations of GA. Isochrysis galbana showed 1.43×105 & 0.61×105 cells/ml cell count with 0.01 mg/L of GA. The maximum cell count recorded for C. vulgaris was 2.29×105 cells/ml at 0.01 mg/L of IAA. Similarly, N. salina showed the highest growth in 0.01 mg/L of IAA (2.16×105 cells/ml), and the growth was lower than in control at 1 mg/L (1.25×105 cells/ml). Isochrysis galbana recorded higher cell count than in control (0.57×105 cells/ml) in 0.1 mg/L (1.9×105 cells/ml) and 0.01 mg/L concentrations of IAA. Study suggests the possibility and potential of phytohormones in the enhanced production of microalgae for various applications.

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