Resumen del producto

Although marine seaweeds have been used as biostimulants since the beginning or modern agriculture, studies have only recently focused on the ability or seaweed extracts and their polysaccharides to enhance growth of plants. In this work, two bioassays were carried out to study the growth-promoting activity of polysaccharide enriched extracts from Ulva lactuca and Padina gymnospora, obtained in neutral (N-PEEs) and alkaline (A-PEEs) conditions. Initially, the effect of polysaccharide enriched extracts on seed germination and growth-promoting activity on tomato (Solanum Iycopersicum cv. Río Grande) plants under in vitro conditions was studied. Half-strength Murashige-Skoog (MS) medium with or without sucrose was supplemented with different concentrations of polysaccharide enriched extracts (0.2, 0.4 and 1.0 mg mL-1). The parameters evaluated were germination percentage, radicle and shoot length and dry weight. In a second experiment, polisaccharide enriched extracts at 1.0 mg mL-1 and indole-3-butyricacid as the control were studied for root inducer activity in mung bean (Vigna radiata). The majority of polysaccharide enriched extracts obtained from U. lactuca and P. gymnospora promoted germination and stimulated growth of tomato plants compared to the controls. Additionally, treatment of mung bean hypocotyl cuttings with polysaccharide enriched extracts of U. lactuca and P. gymnospora induced rooting more rapidly and in greater number compared to the controls when tested at a concentration of 1.0 mg mL-1. The greatest number of roots was achieved with polysaccharide enriched extracts obtained with neutral rather than alkaline conditions. The N-PEE of U. lactuca exhibited higher number or root than equivalents IBA to 10-3. In contrast, A-PEE conditions presented low number of roots. These results provide evidence that polysaccharide enriched extracts act as an effective growth-promoting treatment.

Palabras clave: Padina gymnospora; Growth; Ulva lactuca; Tomato plants; Polysaccharide

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