, Volume 235, Issue 3, pp 629–639 | Cite as

Reduced expression of FatA thioesterases in Arabidopsis affects the oil content and fatty acid composition of the seeds

  • Antonio J. Moreno-Pérez
  • Mónica Venegas-Calerón
  • Fabián E. Vaistij
  • Joaquín J. Salas
  • Tony R. Larson
  • Rafael Garcés
  • Ian A. Graham
  • Enrique Martínez-Force
Original Article


Acyl–acyl carrier protein (ACP) thioesterases are enzymes that control the termination of intraplastidial fatty acid synthesis by hydrolyzing the acyl–ACP complexes. Among the different thioesterase gene families found in plants, the FatA-type fulfills a fundamental role in the export of the C18 fatty acid moieties that will be used to synthesize most plant glycerolipids. A reverse genomic approach has been used to study the FatA thioesterase in seed oil accumulation by screening different mutant collections of Arabidopsis thaliana for FatA knockouts. Two mutants were identified with T-DNA insertions in the promoter region of each of the two copies of FatA present in the Arabidopsis genome, from which a double FatA Arabidopsis mutant was made. The expression of both forms of FatA thioesterases was reduced in this double mutant (fata1 fata2), as was FatA activity. This decrease did not cause any evident morphological changes in the mutant plants, although the partial reduction of this activity affected the oil content and fatty acid composition of the Arabidopsis seeds. Thus, dry mutant seeds had less triacylglycerol content, while other neutral lipids like diacylglycerols were not affected. Furthermore, the metabolic flow of the different glycerolipid species into seed oil in the developing seeds was reduced at different stages of seed formation in the fata1 fata2 line. This diminished metabolic flow induced increases in the proportion of linolenic and erucic fatty acids in the seed oil, in a similar way as previously reported for the wri1 Arabidopsis mutant that accumulates oil poorly. The similarities between these two mutants and the origin of their phenotype are discussed in function of the results.


Acyl–acyl carrier protein thioesterase Deficient mutant FatA Metabolic flux Oil content Triacylglycerols 



Acyl–ACP thioesterase


β-Ketoacyl-ACP synthase II


Stearoyl-ACP desaturase


Oleate desaturase


Linoleate desaturase


Fatty acid elongase



We are grateful to Rosario Sánchez and Valeria Gazda for their technical assistance. We also thank Dr. Luisa Hernández for help with experimental approach. This work was supported by the Spanish MICINN and FEDER, Project AGL2008-01086/ALI.


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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Antonio J. Moreno-Pérez
    • 1
  • Mónica Venegas-Calerón
    • 1
  • Fabián E. Vaistij
    • 2
  • Joaquín J. Salas
    • 1
  • Tony R. Larson
    • 2
  • Rafael Garcés
    • 1
  • Ian A. Graham
    • 2
  • Enrique Martínez-Force
    • 1
  1. 1.Instituto de la GrasaSevilleSpain
  2. 2.Centre for Novel Agricultural Products, Department of BiologyUniversity of YorkYorkUK

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