Review of the Use of Biostimulant Microalgae to Influence the Growth and Development of Ornamental Plants

Németh, Attila and Horváth, Nándor and Katona, Szabina and Molnár, Zoltán (2024) Review of the Use of Biostimulant Microalgae to Influence the Growth and Development of Ornamental Plants. ACTA AGRONOMICA ÓVÁRIENSIS, 65 (1). pp. 36-55. ISSN 1416-647X

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Abstract

The concept of plant biostimulants refers to substances or microorganisms used to improve the efficiency of nutrient uptake of a plant, improve stress tolerance, and improve overall quality. Extracts of microalgae are gaining increasing attention among biostimulants due to their rich bioactive content. Microalgae offer new opportunities in agriculture, wastewater treatment, pharmaceuticals, etc. These tiny organisms are known for their role in carbon dioxide sequestration, bioremediation, and the production of valuable compounds. Biostimulants act on plants through various mechanisms, promoting growth, nutrient mobilisation, and resistance to stress. The abundant amino acids and protein hydrolyzesate in microalgae improve nutrient absorption and act as osmoprotectants against stressors such as heavy metals and salt. The visual appearance of the potted plants plays a crucial role in determining their quality. Although research suggests a consumer preference for organically grown plants, the economic viability of organic ornamental plant production requires careful consideration of production costs and market demand. With the increasing demand for sustainable agricultural practices, the application of plant biostimulants, particularly those derived from microalgae, presents a promising opportunity to enhance productivity, improve soil health, address environmental issues, and overcome challenges posed by new regulations in the European Union related to the use of plant protection products.

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