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Review
. 2013 Sep;29(3):223-33.
doi: 10.5423/PPJ.RW.10.2012.0158.

Current Insights into Research on Rice stripe virus

Won Kyong Cho  1 , Sen Lian  1 , Sang-Min Kim  2 , Sang-Ho Park  1 , Kook-Hyung Kim  1
Affiliations
Review

Current Insights into Research on Rice stripe virus

Won Kyong Cho et al. Plant Pathol J. 2013 Sep.

Abstract

Rice stripe virus (RSV) is one of the most destructive viruses of rice, and greatly reduces rice production in China, Japan, and Korea, where mostly japonica cultivars of rice are grown. RSV is transmitted by the small brown plant-hopper (SBPH) in a persistent and circulative-propagative manner. Several methods have been developed for detection of RSV, which is composed of four single-stranded RNAs that encode seven proteins. Genome sequence data and comparative phylogenetic analysis have been used to identify the origin and diversity of RSV isolates. Several rice varieties resistant to RSV have been selected and QTL analysis and fine mapping have been intensively performed to map RSV resistance loci or genes. RSV genes have been used to generate several genetically modified transgenic rice plants with RSV resistance. Recently, genome-wide transcriptome analyses and deep sequencing have been used to identify mRNAs and small RNAs involved in RSV infection; several rice host factors that interact with RSV proteins have also been identified. In this article, we review the current statues of RSV research and propose integrated approaches for the study of interactions among RSV, rice, and the SBPH.

Keywords: Rice stripe virus; genome; quantitative trait locus; resistance; rice.

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Figures

Fig. 1.
Fig. 1.
Organization of the RSV genome. RSV consists of four RNAs: RNA1, RNA2, RNA3, and RNA4. Viral-sense RNAs and viral-complementary sense RNAs are abbreviated vRNA and vcRNA, respectively, with the corresponding RNA number. The black line indicates the length of nucleotides for each RNA, and the colored rectangular represents the corresponding ORF with the predicted protein size. The sizes (in bp) of 5′, 3′, and intergenic regions are also indicated. The name of each protein is as follows: RdRp in RNA1; P2 (silencing suppressor) and PC2 (glycoprotein) in RNA2; and P3 (nonstructural protein, NS3), PC3 (nucleocapsid protein, CP) in RNA3; P4 (nonstructural disease-specific protein, SP), and PC4 (movement protein, MP) in RNA4.
Fig. 2.
Fig. 2.
The phylogenetic tree of 34 RSV isolates from China, Japan, and Korea. A total of 34 RdRp amino acid sequences for the 34 RSV isolates were retrieved. The phylogenetic tree was constructed based on the neighbor-joining method with 1000 bootstraps using MEGA5 program (www.megasoftware.net). Numbers at each node indicate bootstrap values. The scale bar represents 0.1 substitutions per amino acid site. Protein accession number, name, and country for each isolate are indicated. Orange, green, and blue colors indicate isolates from China, Japan, and Korea, respectively. The phylogenetic tree reveals two groups of RSV isolates. The first group (indicated by the green bar) is composed of isolates from the three countries while the second group (indicated by the red bar) contains isolates only from China.
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