Maximum-likelihood tree showing the relationships of the polyprotein sequences of 14 non-recombinant narcissus viruses.

<p>The amino acid sequences of polyprotein (major open reading frame) regions of Japanese yam mosaic virus (JYMV), scallion mosaic virus (ScaMV), turnip mosaic virus (TuMV) and wild onion symptomless virus (WoSV) related to TuMV phylogenetic group were used. Sweet potato latent virus (SPLV), sweet potato virus 2 (SPV2), sweet potato virus C (SPVC), sweet potato virus G (SPVG) and sweet potato feathery mottle virus (SPFMV) were used as outgroup sequences. Circles at each node indicate the statistical support using the SH method, green circle; SH 1.0 (full support), yellow circle; 0.8 < SH <1.0. (between SH 0.8 and SH 0.9999). Horizontal branch lengths are drawn to scale with the bar indicating 0.1 nt replacements per site. The calculated tree was displayed by TREEVIEW [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0190511#pone.0190511.ref053" target="_blank">53</a>].