Effects of six phytohormones on the growth behavior and cellular biochemical components of Chlorella vulgaris 31

Microalgae possess similar characteristics to higher plants and research has shown that phytohormones can influence the metabolic and physiological properties of microalgae. Trace amounts of phytohormones can affect the production performance of microalgae, which can be used to increase the yield of specific components of microalgae, elevate the position of microalgae in the industrial raw material supply chain, promote green production, and reduce carbon emissions. This study determined the growth and physiological and biochemical composition of Chlorella vulgaris 31 (Cv-31) after 12 days of cultivation under treatment with different concentrations of six phytohormones, 6-benzyladenine (6-BA), ethylene (ETH), gibberellin (GA), indoleacetic acid (IAA), naphthaleneacetic acid (NAA), and salicylic acid (SA). Different concentrations and types of phytohormones had a significant effect on the growth and biochemical composition of Cv-31. GA at 10 mg L-1 effectively promoted the growth and pigment accumulation of Cv-31, while SA at 7.5 mg L-1 increased lipid accumulation by 3.3 times compared to the control. ETH and GA contributed to the accumulation of soluble sugars, but the six phytohormones had a limited effect on the protein content of Cv-31. This study comprehensively examined the effects of six phytohormones at different concentrations on the growth and main components of Cv-31, providing a reference for related research and production.

Automated summary

Research has shown that phytohormones can impact the metabolic and physiological properties of microalgae, influencing their production performance and potential for green production. Different concentrations and types of phytohormones have significant effects on the growth and biochemical composition of microalgae.