Metabolic engineering of biomass for high energy density: oilseed-like triacylglycerol yields from plant leaves

A - Papers appearing in refereed journals

Vanhercke, T., El Tahchy, A., Liu, Q., Zhou, X-R., Shrestha, P., Divi, U. K., Ral, J-P., Mansour, M. P., Nichols, P. D., James, C. N., Horn, P. J., Chapman, K. D., Beaudoin, F., Ruiz-Lopez, N., Larkin, P. J., De Feyter, R. C., Singh, S. P. and Petrie, J. R. 2014. Metabolic engineering of biomass for high energy density: oilseed-like triacylglycerol yields from plant leaves. Plant Biotechnology Journal. 12 (2), pp. 231-239.

AuthorsVanhercke, T., El Tahchy, A., Liu, Q., Zhou, X-R., Shrestha, P., Divi, U. K., Ral, J-P., Mansour, M. P., Nichols, P. D., James, C. N., Horn, P. J., Chapman, K. D., Beaudoin, F., Ruiz-Lopez, N., Larkin, P. J., De Feyter, R. C., Singh, S. P. and Petrie, J. R.
Abstract

High biomass crops have recently attracted significant attention as an alternative platform for the renewable production of high energy storage lipids such as triacylglycerol (TAG). While TAG typically accumulates in seeds as storage compounds fuelling subsequent germination, levels in vegetative tissues are generally low. Here, we report the accumulation of more than 15% TAG (17.7% total lipids) by dry weight in Nicotiana tabacum (tobacco) leaves by the co-expression of three genes involved in different aspects of TAG production without severely impacting plant development. These yields far exceed the levels found in wild-type leaf tissue as well as previously reported engineered TAG yields in vegetative tissues of Arabidopsis thaliana and N.tabacum. When translated to a high biomass crop, the current levels would translate to an oil yield per hectare that exceeds those of most cultivated oilseed crops. Confocal fluorescence microscopy and mass spectrometry imaging confirmed the accumulation of TAG within leaf mesophyll cells. In addition, we explored the applicability of several existing oil-processing methods using fresh leaf tissue. Our results demonstrate the technical feasibility of a vegetative plant oil production platform and provide for a step change in the bioenergy landscape, opening new prospects for sustainable food, high energy forage, biofuel and biomaterial applications.

KeywordsBiotechnology & Applied Microbiology; Plant Sciences
Year of Publication2014
JournalPlant Biotechnology Journal
Journal citation12 (2), pp. 231-239
Digital Object Identifier (DOI)doi:10.1111/pbi.12131
PubMed ID24151938
Open accessPublished as ‘gold’ (paid) open access
FunderHoblitzelle Foundation
National Science Foundation - US
US Department of Energy, BER Division
ISSN14677644
PublisherWiley
Grant IDDE-FG02-09ER64812
112605

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