Genome analysis of cotton leafroll dwarf virus reveals variability in the silencing suppressor protein, genotypes and genomic recombinants in the USA

PLoS One. 2021 Jul 7;16(7):e0252523. doi: 10.1371/journal.pone.0252523. eCollection 2021.

Abstract

Cotton leafroll dwarf virus (CLRDV) is an emerging virus in cotton production in Georgia and several other Southeastern states in the USA. To better understand the genetic diversity of the virus population, the near complete genome sequences of six isolates from Georgia and one from Alabama were determined. The isolates sequenced were 5,866 nucleotides with seven open reading frames (ORFs). The isolates from Georgia were >94% identical with other isolates from the USA and South America. In the silencing suppressor protein (P0), at amino acid position 72, the isolates from Georgia and Alabama had a valine (V), similar to resistant-breaking 'atypical' genotypes in South America, while the Texas isolate had isoleucine (I), similar to the more aggressive 'typical' genotypes of CLRDV. At position 120, arginine (R) is unique to Georgia and China isolates, but absent in Alabama, Texas and South American isolates. Ten potential recombinant events were detected in the isolates sequenced. An increased understanding of CLRDV population structure and genetic diversity will help develop management strategies for CLRDV in the USA cotton belt.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Base Sequence
  • Genome, Viral / genetics*
  • Genomics
  • Genotype*
  • Luteoviridae / genetics*
  • Luteoviridae / physiology
  • Recombination, Genetic*
  • United States

Supplementary concepts

  • Cotton leafroll dwarf virus

Grants and funding

This work is supported by the Georgia Cotton Commission (AWD0001057 to SB), Cotton Incorporated (AWD00011840 to SB), USDA-NIFA-CPPM (FP00017728 to SB) and FAAR-ROAR (AWD00011237 to SB). SB was supported by USDA-HATCH #1020319. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.