Abstract
The genome of the Tenuivirus, Rice stripe virus (RSV) comprises four RNAs, the smallest three of which each contain two open reading frames (ORFs) arranged in an ambisense manner. The expression of the ORFs from RNAs 2–4 in plants and the insect vector, Laodelphax striatellus, was studied using antisera raised against the gene products. In Western blotting of the proteins from infected plants, the molecular masses of p2, p3, pc3 (nucleocapsid protein, N) and p4 (major non-structural protein, NCP) were as expected; that of pc4 appeared larger than expected. Antisera to the N- and C-terminal parts of the complementary ORF on RNA 2, analogous to that encoding glycoproteins on genomes of bunyaviruses and tospoviruses, revealed banding patterns suggestive of processing of the product; the possible processing is discussed. Four types of inclusion bodies were identified by immunofluorescent and immunogold microscopy of thin sections of infected leaves. Most electron-dense amorphous semi-electron-opaque inclusion bodies (dASO) contained only p4 while some contained at least p2, pc2-N, p3, pc3 as well as p4. A ring-like structure containing at least pc2-N, p4 and pc4 was also identified in infected plant cells. Fibrillar amorphous semi-electron-opaque inclusion bodies (fASO) contained only p4. Filamentous electron-opaque inclusion bodies (FEO), which consist of pc2-N.and p4, were found both in infected plant cells and in the mid-gut lumen and mid-gut epithelial cells of L. striatellus. This suggests an interaction between p4 and pc2-N and a function of pc2-N distinct from that of its-homologue in Bunyaviridae. Our results confirm the in vivo ambisense coding strategy of Tenuivirus RNA 2 and provide further evidence that RSV does not produce enveloped virions in infected rice plants.
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Liang, D., Qu, Z., Ma, X. et al. Detection and Localization of Rice stripe virus Gene Products In Vivo. Virus Genes 31, 211–221 (2005). https://doi.org/10.1007/s11262-005-1798-6
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DOI: https://doi.org/10.1007/s11262-005-1798-6