Abstract:
:Synthesis and accumulation of plant oils in the entire vegetative biomass offers the potential to deliver yields surpassing those of oilseed crops. However, current levels still fall well short of those typically found in oilseeds. Here we show how transcriptome and biochemical analyses pointed to a futile cycle in a previously established Nicotiana tabacum line, accumulating up to 15% (dry weight) of the storage lipid triacylglycerol in leaf tissue. To overcome this metabolic bottleneck, we either silenced the SDP1 lipase or overexpressed the Arabidopsis thaliana LEC2 transcription factor in this transgenic background. Both strategies independently resulted in the accumulation of 30-33% triacylglycerol in leaf tissues. Our results demonstrate that the combined optimization of de novo fatty acid biosynthesis, storage lipid assembly and lipid turnover in leaf tissue results in a major overhaul of the plant central carbon allocation and lipid metabolism. The resulting further step changes in oil accumulation in the entire plant biomass offers the possibility of delivering yields that outperform current oilseed crops.
journal_name
Metab Engjournal_title
Metabolic engineeringauthors
Vanhercke T,Divi UK,El Tahchy A,Liu Q,Mitchell M,Taylor MC,Eastmond PJ,Bryant F,Mechanicos A,Blundell C,Zhi Y,Belide S,Shrestha P,Zhou XR,Ral JP,White RG,Green A,Singh SP,Petrie JRdoi
10.1016/j.ymben.2016.12.007subject
Has Abstractpub_date
2017-01-01 00:00:00pages
237-246eissn
1096-7176issn
1096-7184pii
S1096-7176(16)30091-Xjournal_volume
39pub_type
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