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Background  Lipid transporters play an essential role in lipid delivery and distribution, but their influence on seed oil production in oilseed crops is not well studied.    Results  Here, we examined the effect of two lipid transporters,  FAX1  ( fatty acid export1 ) and  ABCA9  ( ATP-binding cassette transporter subfamily A9 ) on oil production and lipid metabolism in the oilseed plant  Camelina sativa . Overexpression (OE) of  FAX1  and  ABCA9  increased seed weight and size, with  FAX1 -OEs and  ABCA9 -OEs increasing seed length and width, respectively, whereas  FAX1 / ABCA9 -OEs increasing both.  FAX1- OE and  ABCA9- OE displayed additive effects on seed oil content and seed yield. Also, OE of  FAX1  and  ABCA9  affected membrane lipid composition in developing pods, especially on phosphatidylcholine, phosphatidylethanolamine, and phosphatidylglycerol. The expression of some genes involved in seed oil synthesis, such as  DGAT2 ,  PDAT1 , and  LEC1 , was increased in developing seeds of  FAX1 - and/or  ABCA9 -OEs.    Conclusion  These results indicate that increased expression of  FAX1  and  ABCA9  can potentially be applied to improving camelina oil production.

Increased expression of fatty acid and ABC transporters enhances seed oil production in camelina