Correction: Transgenic Citrus Expressing an Arabidopsis NPR1 Gene Exhibit Enhanced Resistance against Huanglongbing (HLB; Citrus Greening).

The authors would like to acknowledge the use of the Bi-directional dual promoter complex with enhanced promoter activity for transgene expression in eukaryotes in this study [2]. The authors would like to add the following citations to the References: Li, Z. and D. J. Gray, Bi-directional dual promoter complex with enhanced promoter activity for transgene expression in eukaryotes, US Patent 7,129,343, 2006 [2], and Li, Z., S. Jayasankar and D. J. Gray, Bi-directional duplex promoters with duplicated enhancers significantly increase transgene expression in grape and tobacco. Trans. Res. 13, 2004, 143–154 [3].