Resumen del producto

Liquid extracts made from algae (ELA’s) have a bio-stimulating effect that promotes the development and growth of terrestrial plants. This effect is attributed to their growth regulators such as phytohormones, polysaccharides and nutrients released during hydrolysis. The effect may vary with each group of algae and extraction process used in its preparation. Based on these considerations, the objective of this work was to determine the best process for the production of an extract from three species of algae (Ulva lactuca, Acanthophora spicifera, Eisenia arborea), and mixtures thereof, comparing two extraction processes: water bath (BM) and autoclave alkaline phase (AFA) and the addition of the cyanobacterium Arthrospira maxima supplement and assess the effect of these extracts on the growth of terrestrial plants. The effectiveness of ELA’s in vitro and in vivo (hydroponics) of mung bean (Vigna radiata), red radish (Raphanus sativus) and romaine lettuce (Lactuca sativa) was evaluated. There were significant differences between extraction methods and a synergistic effect in combining the ELA’S of two algal species. Effect of promoter activity on growth was dependent on the crop assessed. In the in vitro cultivation of mung bean, extracts with the best effects were those produced in tests using AFA and the alga E. arborea. In the cultivation of radish, the most effective extract was made with AFA and U. lactuca + A. spicifera. Lettuce growth was enhanced by more than one extract, the most prominent being ELA’s made with U. lactuca and A. spicifera. In vivo tests showed that plants treated with ELA’s mixtures of: U. lactuca + A. spicifera produced in AFA, U. lactuca + E. arborea produced in BM and the positive control, had a greater resistance to high temperatures (12 weeks 35- 41 °C), and those plants treated with a mixture of U. lactuca + A. spicifera were resistant to pests.

Palabras clave: Algae; biotechnology; seaweed; agriculture

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