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Differential molecular response of maize and Johnson grass against maize dwarf mosaic virus and bermuda grass southern mosaic virus.

Maize dwarf mosaic virus (MDMV) and bermuda grass southern mosaic virus (BgSMV) is the most important cereal potyvirus in Iran. Expression of some key genes in maize plants susceptible and tolerant to MDMV or BgSMV and gene expression profile of MDMV and BgSMV compatible or incompatible to Johnson grass plants were studied. Time points of 1, 9, 24 and 72 h after inoculation with both viruses were investigated as well. By analyzing the expression of the genes, it was identified that in maize infected by MDMV and BgSMV, the transcript levels of the peroxiredoxin, GLP, SAM, NPR1 and chlorophyll a-b binding genes were significantly higher in the tolerant than in susceptible plants during the entire experiment. In the BgSMV inoculated Johnson grass plants, some of the genes related to plant defense responses including NPR1, peroxiredoxin and SAM had higher expression level than the Johnson grass plants inoculated by MDMV. Important genes in maize tolerance like NPR1 and MT-LP, were analyzed by trilinear decomposition analysis and genes clustering. The upregulated expression of genes at one-hour post inoculation showed that the plant response to viruses was activated at the early stage of infection. Keywords: MDMV; BgSMV; gene expression; quantitative real-time PCR; trilinear decomposition analysis.