Abstract
Recent research has shown that the use of biological extracts, which contain a wide variety of nutrients and phytohormones are potentially useful in the production of plants of agricultural importance. Seaweed extracts are particularly rich in minerals and micronutrients necessary for the growth of microalgae. The effect of three commercial extracts of Ascophyllum nodosum as plant growth inducers (Stimplex®, Acadian Soils® and Liquid Seaweed Concentrate®), provided by Acadian Sea Plants Ltd., were evaluated in relation to the growth and production of biomass and carotenoids in Haematococcus pluvialis. The results were evaluated by one-way ANOVA and post-hoc analysis utilizing Tukey's test with a significance level of 95% (α= 0.05). The reference medium used was the Bold basal medium, to which 250 ppm of each extract was added. The Stimplex® extract had an increase of 22.79% in cell density and 17% in dry matter, higher than the control culture. The content of carotenoids and antioxidant capacity, respectively, with Stimplex® was 30.05% and 141.76% higher than the control culture.
Highlights
Haematococcus pluvialis is freshwater microalgae which under stress conditions such as nutrient limitation and excessive irradiation or drought conditions accumulates high value carotenoids (Gómez et al 2016, Zhao et al 2019)
This is comparable to green microalgae because of their photosynthetic and their physiological similarity, as well as their chemical nature; there is the possibility that such stimulating effects on plant growth are reflected in microalgae such as H. pluvialis
The experiment consisted of three treatments, in which 250 ppm extract of A. nodosum was added to the Bold basal medium (BBM) as follows: In the first treatment 250 ppm of S (BBM-S) was added, in the second treatment 250 ppm of F (BBM-F) was added and in the third treatment, 250 ppm of AE (BBM-AE) was added
Summary
Haematococcus pluvialis is freshwater microalgae which under stress conditions such as nutrient limitation and excessive irradiation or drought conditions accumulates high value carotenoids (Gómez et al 2016, Zhao et al 2019). H. pluvialis is commercially exploited for its high content of metabolites echinenone, canthaxanthin, adonirubin and astaxanthin (Hernández & Labbé 2014) The cost of these metabolites is due in part to their enormous demand in the pharmaceutical and food industries, coupled with their low production of biomass (0.5-5.0 g L-1 dry weight) and the poor accumulation of carotenoids (4% of dry weight) (Collins et al 2011, Vandamme et al 2013). The marine macroalga Ascophyllum nodosum belonging to the Phaeophytes family provided minerals, macronutrients and growth hormones that significantly promote root and foliar development in plants (Rahmann et al 2017) This is comparable to green microalgae because of their photosynthetic and their physiological similarity, as well as their chemical nature; there is the possibility that such stimulating effects on plant growth are reflected in microalgae such as H. pluvialis. The exploration of the potential stimulation of the commercial market for products made from extracts of A. nodosum on the production of biomass and carotenoids, as well as their antioxidant activity on H. pluvialis, has been proposed in this research
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