Tobacco as a production platform for biofuel: overexpression ofArabidopsis DGATandLEC2genes increases accumulation and shifts the composition of lipids in green biomass

Autor:	Joseph L. Dixon, Anita M. Brinker, Karolina Andryszak, Natalia Pogrebnyak, Maxim Golovkin, Paulina Matyszczuk, Marilyn Laurelli, John T. Flynn, Sergei Spitsin, Nikolai Borisjuk, Vyacheslav Andrianov, Hilary Koprowski
Rok vydání:	2010
Předmět:	food.ingredient Nicotiana tabacum Arabidopsis Biomass Plant Science Genetically modified crops Metabolic engineering Transformation Genetic food Gene Expression Regulation Plant Tobacco Botany Arabidopsis thaliana Diacylglycerol O-Acyltransferase Triglycerides biology Arabidopsis Proteins Fatty Acids fungi food and beverages Plants Genetically Modified biology.organism_classification RNA Plant Biofuels Agronomy and Crop Science Solanaceae Cotyledon Transcription Factors Biotechnology
Zdroj:	Plant Biotechnology Journal. 8:277-287
ISSN:	1467-7652 1467-7644
DOI:	10.1111/j.1467-7652.2009.00458.x
Popis:	When grown for energy production instead for smoking, tobacco can generate a large amount of inexpensive biomass more efficiently than almost any other agricultural crop. Tobacco possesses potent oil biosynthesis machinery and can accumulate up to 40% of seed weight in oil. In this work, we explored two metabolic engineering approaches to enhance the oil content in tobacco green tissues for potential biofuel production. First, an Arabidopsis thaliana gene diacylglycerol acyltransferase (DGAT) coding for a key enzyme in triacylglycerol (TAG) biosynthesis, was expressed in tobacco under the control of a strong ribulose-biphosphate carboxylase small subunit promoter. This modification led to up to a 20-fold increase in TAG accumulation in tobacco leaves and translated into an overall of about a twofold increase in extracted fatty acids (FA) up to 5.8% of dry biomass in Nicotiana tabacum cv Wisconsin, and up to 6% in high-sugar tobacco variety NC-55. Modified tobacco plants also contained elevated amounts of phospholipids. This increase in lipids was accompanied by a shift in the FA composition favourable for their utilization as biodiesel. Second, we expressed in tobacco Arabidopsis gene LEAFY COTYLEDON 2 (LEC2), a master regulator of seed maturation and seed oil storage under the control of an inducible Alc promoter. Stimulation of LEC2 expression in mature tobacco plants by acetaldehyde led to the accumulation of up to 6.8% per dry weight of total extracted FA. The obtained data reveal the potential of metabolically modified plant biomass for the production of biofuel.
Databáze:	OpenAIRE
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