title: Plant Growth Biostimulants Based on Different Methods of Seaweed Extraction with Water.
abstract: We explored two methods for obtaining aqueous extracts: boiling and soaking of Baltic seaweeds (EB and ES, resp.). Algal extracts were characterized in terms of polyphenols, micro- and macroelements, lipids content, and antibacterial properties. The utilitarian properties were examined in the germination tests on Lepidium sativum for three extract dilutions (0.5, 2.5, and 10%). It was found that the extracts were similar in micro- and macroelement concentrations. Water was proved to be a good solvent to extract phenolic compounds. The algal extract produced by soaking biomass did not show inhibitory effect on Escherichia coli and Staphylococcus aureus. Only the boiled extract had an inhibitory activity against E. coli. Germination tests revealed a positive influence of the bioproducts on the cultivated plants. In the group treated with 10% EB, plants were 13% longer than in the control group; the content of elements B, Mo, Zn, and Na in the group treated with 10% ES was higher by 76%, 48%, 31%, and 59% than in the control group, respectively; the content of chlorophyll was 2.5 times higher in 0.5% ES than in the control group. Extracts showed the slight impact on the morphology of plants.
authors.affiliation: Department of Advanced Material Technologies, Faculty of Chemistry, Wrocław University of Technology, Smoluchowskiego 25, 50-372 Wrocław, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Godlewska
authors.affiliation: Department of Advanced Material Technologies, Faculty of Chemistry, Wrocław University of Technology, Smoluchowskiego 25, 50-372 Wrocław, Poland.
authors.forename: Izabela
authors.identifier: 0000-0001-8084-9642
authors.initials: I
authors.lastname: Michalak
authors.affiliation: Department of Advanced Material Technologies, Faculty of Chemistry, Wrocław University of Technology, Smoluchowskiego 25, 50-372 Wrocław, Poland.
authors.forename: Łukasz
authors.initials: Ł
authors.lastname: Tuhy
authors.affiliation: Department of Advanced Material Technologies, Faculty of Chemistry, Wrocław University of Technology, Smoluchowskiego 25, 50-372 Wrocław, Poland.
authors.forename: Katarzyna
authors.initials: K
authors.lastname: Chojnacka
mesh_terms: D031220:Lepidium sativum / Q000187:drug effects / Q000254:growth & development*; D059625:Liquid-Liquid Extraction / Q000379:methods*; D010937:Plant Growth Regulators / Q000138:chemical synthesis* / Q000494:pharmacology*; D012624:Seaweed / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
chemical_list: D010937:Plant Growth Regulators; D014867:Water