Abstract
The root lesion nematode Pratylenchus penetrans is a migratory species that attacks a broad range of plants. While analysing transcriptomic datasets of P. penetrans, we have identified a full-length genome of an unknown positive-sense single-stranded RNA virus, provisionally named root lesion nematode virus 1 (RLNV1). The 8614-nucleotide genome sequence encodes a single large polyprotein with conserved domains characteristic for the families Picornaviridae, Iflaviridae and Secoviridae of the order Picornavirales. Phylogenetic, BLAST and domain search analyses showed that RLNV1 is a novel species, most closely related to the recently identified sugar beet cyst nematode virus 1 and potato cyst nematode picorna-like virus. In situ hybridization with a DIG-labelled DNA probe confirmed the presence of the virus within the nematodes. A negative-strand-specific RT-PCR assay detected RLNV1 RNA in nematode total RNA samples, thus indicating that viral replication occurs in P. penetrans. To the best of our knowledge, RLNV1 is the first virus identified in Pratylenchus spp.
Highlights
The root lesion nematode Pratylenchus penetrans is a migratory species that attacks a broad range of plants
The viruses have been identified in sedentary nematode species, such as the soybean cyst nematode (SCN; Heterodera glycines), two potato cyst nematode (PCN) species, Globodera pallida and G. rostochiensis, clover cyst nematode (CCN; H. trifolii) and sugar beet cyst nematode (SBCN; H. schachtii)
While analysing transcriptomic datasets previously generated from two independent pools of P. penetrans [9], we have identified by BLAST searches transcripts associated with an unknown positive-sense single-stranded RNA virus
Summary
The root lesion nematode Pratylenchus penetrans is a migratory species that attacks a broad range of plants. This is the first report of a novel, positive-sense single-stranded RNA virus infecting the migratory root lesion nematode from the family Pratylenchidae, Pratylenchus penetrans.
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