Infection by Grapevine fanleaf nepovirus (GFLV), a bipartite RNA virus of positive polarity belonging to the Comoviridae family, causes extensive cytopathic. The specific transmission of Grapevine fanleaf virus by its nematode vector Xiphinema index is solely determined by the viral coat protein. There are plenty of plant viruses that no one has heard of, but few are as widely known as grapevine fanleaf virus. Learn how to identify a sick.

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No electron-dense structures similar to those described in CPMV-infected cells 15 were observed. The sedimentation of Golgi Faleaf. Excitation and emission wavelengths were and to nm, respectively, for either GFP or A and and to nm, respectively, for A Infected berries are uneven in size with numerous small and seedless individuals, some of which may not mature. Intracellular localization of poliovirus plus- and minus-strand RNA visualized by strand-specific fluorescent in situ hybridization.

Such parallelism is not unexpected since CPMV and GFLV belong to the same family and share many common grpaevine, among them a similar genome organization 2. Evidence for the involvement of virus-induced vesicles in fanlaef replication was obtained already in the sixties 10and the molecular mechanisms underlying the formation of virus-induced vesicles, their origin, and their role in viral replication were recently unraveled 1958 Whereas the center of the rosettes was rather amorphous and electron dense, their periphery was made of vesicles similar in size to the isolated vesicles seen grapevlne Fig.

In contrast to proteins involved in viral replication, the 2B movement protein and, to a lesser extent, the 2C coat protein were not confined to the viral compartment but were transported toward the cell periphery, a finding consistent with their role in cell-to-cell movement of virus particles.


In the case of poliovirus, it was shown that specific viral proteins were responsible for vesicle formation 6762 and that formation of the poliovirus replication complex is a process that requires coupled viral translation, vesicle production, and viral RNA synthesis Similarity in gene organization and homology between proteins of animal picornaviruses and a plant comovirus suggest common ancestry of these virus families.

Characterization of rubella virus replication complexes using antibodies to double-stranded RNA. The trapping of vesicles was particularly pronounced in fractions 11 to 13, which proved to be highly enriched in vesicles ca. Canes are also malformed, showing abnormal branching, double nodes, different length or exceedingly short ffanleaf, fasciations, and zigzag growth.

Grapevine fanleaf virus

The membranes were then incubated with goat anti-rabbit IgG A or goat anti-mouse IgG B and C coupled to horseradish peroxidase and revealed by chemiluminescence. Crystal structure of Grapevine Fanleaf Virus capsid.

On the contrary, anti-VPg revealed several bands in total Fig. Such rosettes were very reminiscent both in morphology and size to those isolated by ISEM from trapevine cells 45. Figures 2 and 3. Four bands of VPg-containing precursors that migrated in the gel with apparent molecular masses of ca.

After they were washed with bidistilled water, the grids were fanleaaf for 10 min on 0. Detection of viral proteins in cytopathic structures in cowpea protoplasts infected with cowpea mosaic virus. Effect of cerulenin on the synthesis of very-long-chain fatty acids in microsomes from leek seedlings.

Association of cowpea mosaic virus-induced double-stranded RNA in a cytopathological structure in infected cells. In an attempt to visualize the membranes that cosedimented with the VPg precursors, ISEM was performed on sucrose gradient fractions with immunoaffinity-purified anti-VPg antibodies.

Grapevine fanleaf virus

Phospholipid biosynthesis and poliovirus genome replication, two coupled phenomena. The cell lines used were: Browse related by Tag grapesgrapes disease management. Arrowheads, Golgi; N, nucleus; P, plastids; M, mitochondria.


This plant virus article is a stub. Malformations of leaves and canes are usually not prominent, but clusters may be smaller than normal and may have shot berries. Journal List J Virol v. However, Golgi stacks were never found in the VPg-labeled aggregates, as judged by the absence of yellow signal in the merged pictures Fig.

Brefeldin A causes disassembly of the Golgi complex and accumulation of gtapevine proteins in the endoplasmic reticulum. In contrast, dsRNA labeling Fig. Protoplasts fixation and embedding for electron microscopy. The intimate association between VPg accumulation sites and replication centers, as visualized by CLSM, strongly suggests that VPg either fully processed or as a precursor is a component of the grapevihe replication complexes.

Such complexes probably ensure protection of the viral RNA being synthesized from degradation by cellular RNases.

Consistent with its function in cell-to-cell movement, the movement protein was generally detected at the cell periphery at 48 hpi, probably after its release from the precursor polyprotein. In view of the close resemblance between both systems, we suggest that GFLV could use a similar mechanism to recruit membranes for replication purposes.

The coat protein derives from RNA2 [5] and forms the icosahedral capsid of 60 identical protein subunits. The rooting grpaevine of rootstocks and the graft take of scions are both substantially reduced in grapevine fanleaf virus GFLV -infected material.