Post-Transcriptional Gene Silencing of the p23 Silencing Suppressor of Citrus tristeza Virus Confers Resistance to the Virus in Transgenic Mexican Lime
Citrus is the most important fruit tree crop in the world, with a cultivated surface of more than 7 million ha distributed in about 100 countries, mainly in tropical and subtropical areas, and a fruit production of more than 100 million tons per year (FAO, 2005). Citrus tristeza virus (CTV) causes the most destructive viral disease and is considered a major threat for the citrus industry worldwide. CTV produces decline and death of scion varieties, except lemons (Citrus limon (L.) Burm.), grafted on sour orange (C. aurantium (L.). Additionally, severe CTV strains cause stem pitting, stunting, low yield and poor fruit quality of some varieties of sweet orange (C. sinensis (L.) Osb.), limes (C. aurantifolia (Christ.) Swing.; C. latifolia Tan.) and grapefruits (C. paradisi Macf.), regardless the rootstock used (Bar-Joseph et al., 1989).
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- Fagoaga C, López C, Moreno P, Navarro L, Flores R, Peña, L (2005) Viral-like symptoms induced by the ectopic expression of the p23 gene of citrus tristeza virus are citrus-specific and do not correlate with the pathogenicity of the virus strain. Mol. Plant Microbe Interaction 18: 435-445. FAO (2005) http//faostat.fao.org.