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Complete genome sequence of a variant of maize-associated totivirus from Ecuador

Abstract:

The complete genomic sequence of a variant of the recently reported maize-associated totivirus (MATV) from China was obtained from commercial maize in Ecuador. The genome of MATV-Ec (Ecuador) (4,998 bp) is considerably longer than that of MATV-Ch (China) (3,956 bp), the main difference due to a ≈ 1-kb-long capsid-protein-encoding fragment that is completely absent from the Chinese genome. Sequence alignments between MATV-Ec and MATV-Ch showed an overall identity of 82% at the nucleotide level, whereas at the amino acid level, the viruses exhibited 95% and 94% identity for the putative capsid protein and the RNA-dependent RNA polymerase (RdRp), respectively. Phylogenetic analysis of the viral RdRp domain indicated that MATV-Ec and MATV-Ch share a common ancestor with other plant-associated totiviruses, with Panax notoginseng virus A as the closest relative. MATV-Ec was detected in 46% (n = 80) of maize plants tested in this study, but not in endophytic fungi isolated from plants positive for the virus.