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Sweet potato virus disease (SPVD) is the most devastating disease of sweetpotato (Ipomoea batatas (L.) Lam.) globally. It is caused by the co-infection of plants with a potyvirus, sweet potato feathery mottle virus (SPFMV), and a crinivirus, sweet potato chlorotic stunt virus (SPCSV). In this study we report the use of cDNA microarrays, contain- ing 2765 features from sweetpotato leaf and storage root libraries, in an effort to assess the effect of this disease and its individual viral components on the gene expression profi le of I. batatas cv. Beauregard. Expression analysis revealed that the number of differentially expressed genes (P < 0.05) in plants infected with SPFMV alone and SPCSV alone compared to virus-tested (VT) plants was only 3 and 14, respectively. However, these fi ndings are in contrast with SPVD-affected plants where more than 200 genes were found to be differentially expressed. SPVD-responsive genes are involved in a variety of cellular processes including several that were identifi ed as pathogenesis- or stress-induced. Sweetpotato is the seventh most important food crop in the world, with annual world production of ≈130 million tonnes. It ranks third among root and tuber crops worldwide (Food and Agriculture Organization of the United Nations, 2005). Viral diseases, including those caused by mixed infections, are of major economic importance in most production areas around the globe. The use of vegetative cuttings as a principal propagation method provides viruses an effi cient way to perpetuate and disseminate between growing seasons as well as growing areas (Salazar and Fuentes, 2001). As many as 19 different viruses have been identi- fi ed in sweetpotato and 11 of these are currently recognized by the International Committee of Taxonomy of Viruses (Kreuze, 2002). The effects of these viruses on production range from minimal, to completely devastating, depending on the infecting virus, virus complexes, and sweetpotato cultivars involved. The most important and devastating viral disease affecting sweetpotatoes worldwide is sweet potato virus disease (SPVD). Yield losses of up to 90% have been reported in plants affected with SPVD (Gutierrez et al., 2003; Hahn, 1976; Ngeve, 1990). SPVD is caused by a synergistic interaction between a potyvirus, sweet potato feathery mottle virus (SPFMV), and a crinivirus,

The Effect of Sweet Potato Virus Disease and its Viral Components on Gene Expression Levels in Sweetpotato