Transgenic Research

, Volume 17, Issue 5, pp 839–850 | Cite as

Silencing of GmFAD3 gene by siRNA leads to low α-linolenic acids (18:3) of fad3-mutant phenotype in soybean [Glycine max (Merr.)]

  • Teresita Flores
  • Olga Karpova
  • Xiujuan Su
  • Peiyu Zeng
  • Kristin Bilyeu
  • David A. Sleper
  • Henry T. Nguyen
  • Zhanyuan J. Zhang
Original Paper

Abstract

RNA interference (RNAi) has been recently employed as an effective experimental tool for both basic and applied biological studies in various organisms including plants. RNAi deploys small RNAs, mainly small interfering RNAs (siRNAs), to mediate the degradation of mRNA for regulating gene expression in plants. Here we report an efficient siRNA-mediated gene silencing of the omega-3 fatty acid desaturase (FAD3) gene family in a complex genome, the soybean (Glycine max). The FAD3 enzyme is responsible for the synthesis of α-linolenic acids (18:3) in the polyunsaturated fatty acid pathway. It is this fatty acid that contributes mostly to the instability of soybean and other seed oils. Therefore, a significant reduction of this fatty acid will increase the stability of the seed oil, enhancing the seed agronomical value. A conserved nucleotide sequence, 318-nt in length, common to the three gene family members was used as an inverted repeat for RNA interference. The RNAi expression cassette was driven by a seed-specific promoter. We show that the transgene-produced siRNA caused silencing of FAD3 that was comparable to the fad3 mutant phenotype and, furthermore, that such a silencing is stably inherited in engineered soybean lines. Since the pool size of the α-linolenic acids is small relative to the other polyunsaturated fatty acids in soybean, the significant reduction of this fatty acid suggests a role and great potential for the siRNA strategy in silencing gene families in a complex genome.

Keywords

RNAi siRNA Inverted repeat Gene silencing GmFAD3 

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Teresita Flores
    • 1
    • 2
  • Olga Karpova
    • 1
  • Xiujuan Su
    • 1
  • Peiyu Zeng
    • 1
    • 3
  • Kristin Bilyeu
    • 4
  • David A. Sleper
    • 5
  • Henry T. Nguyen
    • 5
  • Zhanyuan J. Zhang
    • 1
  1. 1.Plant Transformation Core Facility, Division of Plant SciencesUniversity of MissouriColumbiaUSA
  2. 2.Department of BiochemistryUniversity of MissouriColumbiaUSA
  3. 3.Department of Nature Science, College of Agriculture and TechnologyState University of New YorkCobleskillUSA
  4. 4.USDA-ARS, University of MissouriColumbiaUSA
  5. 5.Division of Plant SciencesUniversity of MissouriColumbiaUSA

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