Detection and genetic variation analysis of apple chlorotic leaf spot virus and apple stem grooving virus in wild apple (Malus sieversii) from Xinjiang, China

Abstract

AbstractHere, we produced nucleotide and amino acid sequences of the movement protein (MP) and the coat protein (CP) genes of apple chlorotic leaf spot virus (ACLSV) and apple stem grooving virus (ASGV) from wild apple of Xinjiang, the main progenitor of the domesticated apple. Genetic variation and phylogenetics were assessed using these and previously reported sequences. Phylogenetic analysis of ACLSV nucleotide and amino acid data sets assigned some ACLSV variants to known groups and others to novel clades. In an MP‐based phylogenetic tree, ASGV sequences downloaded from GenBank and those of wild apple isolates were assigned to separate groups. A recombinant sequence was identified in a ACLSV variant (MS‐GL‐1‐c‐3) of wild apple, and both parents of the recombinant had been isolated from the same plant (GL). Two potential recombination events of ASGV (MS‐GL‐2‐g‐3 and MS‐NF‐1‐g‐3) were identified in this study. These findings may constitute a valuable basis for future studies on variability of virus genetics and pathogenicity.