SEAWEED LIQUID FERTILIZER EFFECT ON PHYSIOLOGICAL AND BIOCHEMICAL PARAMETERS OF BEAN PLANT (PHAESOLUS VULGARIS VARIETY PAULISTA) UNDER HYDROPONIC SYSTEM

Abstract

The seaweed extract application on bean plant (Phaseolus vulgaris c. v. Paulista) enhanced the vegetative growth at lower concentrations 25% of Fucus spiralis and 25% of Ulva rigida that was found to have maximum influencer, on growth parameters as shoot length and root length. When Seaweed liquid extracts (SLE) applied by foliar spray or incorporated in the medium with the Hoagland nutrient solution under hydroponic system, biochemical parameters such as chlorophyll pigment and proteins content were also enhanced when compared to untreated bean plants. High proportions of seaweed extract in medium culture (100% of Fucus spiralis extract; 75% and 100% of Ulva rigida extract) were found to show negative effect. The examining of nitrate reductase activity showed that foliar application of seaweed extract increased this enzymatic activity. The Ulva rigida extract was more effective than Fucus spirali extract. (1.48 mol NO2-/mg protein/min and 0.653 mol NO2-/mg protein/min respectively). However, the incorporation of Ulva rigida extract in medium culture showed an important decreasing of nitrate reductase activity. While, the incorporation of Fucus spiralis extract in medium culture showed a remarkable increased of nitrate reductase activity particularly at proportion (50% and 75% of Fucus spiralis extract). The activation of nitrate reductase enzyme was related to the presence of seaweed extract of Unlva rigida and Fucus spiralis applying on bean plant by foliar spray. Their incorporation in medium culture inhibits this enzymatic activity.