Characterization of two novel mitoviruses co infecting a single strain of Fusarium pseudograminearum causing wheat crown rot
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A Contrast of Three Inoculation Techniques used to Determine the Race of Unknown Fusarium oxysporum f.sp. niveum Isolates
Published on: October 28, 2021
Xin Pan1, Yuan Xie1, Shuwei Yan1
1College of Plant Protection, Henan Agricultural University, Zhengzhou, 450002, China.
Abstract:
Wheat crown rot (WCR), caused by Fusarium pseudograminearum, poses a threat to wheat production worldwide. Two mycoviruses, designated as "Fusarium pseudograminearum mitovirus 2" (FupgMV2) and "Fusarium pseudograminearum mitovirus 3" (FupgMV3), were identified in F. pseudograminearum strain YY514-10-2. The two viral genomes are 2,429 and 2,450 nucleotides long, each containing a single open reading frame (ORF) encoding a 724-amino-acid-long RNA-dependent RNA polymerase (RdRp), with 31.98% amino acid sequence identity to each other. BLASTp analysis revealed that the RdRp of FupgMV2 exhibits at least 88.84% amino acid sequence identity to that of Fusarium mitovirus 1, while the RdRp of FupgMV3 shows 80.19% amino acid sequence identity to that of Fusarium mitovirus 2. Phylogenetic analysis indicated that FupgMV2 and FupgMV3 both belong to the genus Unuamitovirus of the family Mitoviridae. This is the first report of two mitoviruses hosted by the same strain of the plant-pathogenic fungus F. pseudograminearum.
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