Graduate Theses & Dissertations

Hormonal Algae
Based on an endogenous hormone study, three cytokinin type phytohormones; benzyladenine (BA), trans-zeatin (tZ) and methylthiol trans-zeatin (MeSZ), as well as abscisic acid (ABA) were exogenously added at three concentrations (10-7, 10-6 and 10-5 M) to cultures of Chlorella vulgaris in an attempt to alter growth rate, total lipid and fatty acid yields and fatty acid profile. Growth stimulation was highest at 10-6 M for BA, MeSZ and ABA and 10-5 M for tZ. All treatments caused changes in total lipid and fatty acid content, with BA causing an increase to lipid content. The most significant change in the fatty acid profile was observed with the addition of MeSZ at 10-7 and 10-6 M causing increases of 204% and 457% in linolenic acid respectively above the control. These results are novel and potentially highly impactful, as MeSZ has never been added exogenously to algae and may be used to stimulate overproduction of linolenic acid for pharmaceutical or industrial purposes. Author Keywords: Abscisic Acid, Chlorella vulgaris, Cytokinin, Fatty acid, Linolenic Acid, Methylthiol trans-Zeatin

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