The disruption of the SUGAR-DEPENDENT1 (SDP1) lipase in Arabidopsis leads to significant triacylglycerol (TAG) accumulation in vegetative tissues, particularly in roots. This study demonstrates that TAG content in sdp1-5 mutant roots increases progressively with plant age, reaching over 1% of dry weight at maturity—representing a 50-fold increase compared to wild-type plants. The accumulation is not only time-dependent but also highly responsive to external carbohydrate supply. When grown on medium supplemented with 3% (w/v) sucrose, TAG levels in sdp1-5 roots can rise to approximately 17% of dry weight, approaching the oil content found in seed tissues of many crop species. This dramatic enhancement indicates that substrate availability is a key limiting factor for TAG storage.
The TAG accumulation observed in sdp1-5 roots is dependent on both ACYL-COENZYME A:DIACYLGLYCEROL ACYLTRANSFERASE1 (DGAT1) and PHOSPHATIDYLCHOLINE:DIACYLGLYCEROL ACYLTRANSFERASE1 (PDAT1), which catalyze the final steps in TAG biosynthesis. Disruption of DGAT1 reduces root TAG levels by more than 60%, while PDAT1 deficiency causes a smaller but statistically significant decrease.Teniposide In Vivo These findings confirm that both enzymes contribute to TAG synthesis in heterotrophic tissues, even under conditions of impaired lipid breakdown.
Furthermore, combining SDP1 loss-of-function with constitutive overexpression of WRINKLED1 (WRI1) and DGAT1 results in an additive effect on TAG accumulation. In transgenic lines expressing both WRI1 and DGAT1, TAG content reaches 5–8% of dry weight in roots, stems, and leaves.7-Ketocholesterol medchemexpress When these plants are grown on sucrose-supplemented medium, root TAG levels surge to 17%.PMID:34996659 This level of lipid deposition rivals that of mature seeds in several major oil crops, demonstrating the feasibility of engineering high-oil biomass in non-seed tissues.
These results highlight the importance of simultaneously manipulating multiple metabolic pathways: enhancing carbon supply via sugar provision, boosting fatty acid synthesis through WRI1, increasing TAG assembly through DGAT1, and inhibiting TAG degradation via SDP1 disruption. The combined strategy effectively redirects carbon flux toward storage lipids, enabling substantial oil accumulation in vegetative organs. Notably, this approach does not require altering photosynthetic capacity or introducing foreign genes; instead, it leverages endogenous pathways already present in plants.
The data suggest that SDP1-mediated TAG turnover acts as a major regulatory checkpoint in vegetative tissues, especially in heterotrophic organs like roots. Its function limits oil buildup even when synthetic capacity is enhanced. By disrupting this brake, and simultaneously fueling the system with sugars and amplifying biosynthetic enzymes, plants can be reprogrammed to store energy-rich oils in their stems and roots—tissues that constitute the bulk of harvestable biomass in many crops.
This work provides a robust blueprint for engineering high-oil yield in terrestrial plants. It supports the idea that modifying lipid metabolism in vegetative tissues could dramatically improve the energy density and economic value of bioenergy feedstocks. Future applications may extend to perennial grasses, legumes, and other biomass crops where such modifications could lead to commercially viable oil production without compromising grain yield.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com