Jatropha curcas L. is a small, woody tree of the Euphorbiaceae family. This plant can grow on marginal land in the tropical and subtropical regions and produces seeds containing up to 30% oil. Several Asian countries have selected Jatropha for large scale planting as a biodiesel feedstock. Nevertheless, Jatropha also possesses several undesirable traits that may limit its wide adoption. An improved understanding of plant development and the regulation of fatty acid (FA) and triacylglyceride biosynthesis in Jatropha is particularly facilitative for the development of elite crops. Here, we show that a tobacco rattle virus (TRV) vector can trigger virus-induced gene silencing (VIGS) in Jatropha. Our optimized method produced robust and reliable gene silencing in plants agroinoculated with recombinant TRV harbouring Jatropha gene sequences. We used VIGS to investigate possible functions of 13 Jatropha genes of several functional categories, including FA biosynthesis, developmental regulation and toxin biosynthesis, etc. Based on the effects of VIGS on the FA composition of newly emerged leaves, we determined the function of several genes implicated in FA biosynthesis. Moreover, VIGS was able to discriminate independent functions of related gene family members. Our results show that VIGS can be used for high-throughput screening of Jatropha genes whose functions can be assayed in leaves.
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