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800x600 The use of extracts obtained from marine algae as plant growth stimulants have been widely studied since the first product was released. It has been shown that these products stimulate plant growth. Most of the extracts are produced by alkaline hydrolysis from brown algae; however, little scientific information has been published about the production process of extracts. Generally, the companies and scientists publish the product's effects on a plant model. The aims of this research were to obtain liquid extracts from brown algae M. pyrifera using alkaline hydrolysis, and to assess the effects of these extraction conditions in auxin-like activity. We also assessed the effect of the resulting products on tomato (Lycopersicon esculentum) plant. In a semi-industrial scale plant, extracts of M. pyrifera were obtained under different combinations of temperature (40-80 º C) and pH (8-10). Changes in the viscosity during the process were measured as an indirect index of the components extraction. The auxin-like activities of extracts were measured using mung bean hypocotyls (Vigna radiata) bioassay. Also, the effect of extracts on germination and growth of tomato were experimented. All extracts shown auxin-like activity at 5% and higher concentrations. The addition of extract (1%) improved growth of root and tomato seedlings. The highest viscosity was obtained at pH 10 however auxin-like activity and improved growth were better when using extracts obtained at lower viscosities (pH 9).

Palabras clave: Macrocystis; Growth; Algae; tomato; seaweeds; extract; auxin

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