White clover mosaic virus

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White clover mosaic virus

White clover mosaic virus (WClMV) is a plant pathogenic virus in the genus Potexvirus
Potexvirus

Potexvirus is a genus of plant pathogenic viruses, belonging to the family Flexiviridae. Transmission occurs mechanically, with viruses in this genus causing mosaic and ringspot symptoms....
and the family Flexiviridae
Flexiviridae

The Flexiviridae are a family of viruses. The viruses are filamentous and named for being highly flexible. This family was described in the literature in 2004 after being approved as a new Family by the International Committee on Taxonomy of Viruses based on Molecular phylogeny of proteins ....
. WClMV is a filamentous, flexuous rod, 480 nm in length and 13 nm wide.

The virus is a monopartite strand of positive-sense, single-stranded RNA surrounded by a capsid made from a single viral encoded protein. The genome has been completely sequenced and is 5845 nucleotides long.

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Encyclopedia

White clover mosaic virus (WClMV) is a plant pathogenic virus in the genus Potexvirus
Potexvirus

Potexvirus is a genus of plant pathogenic viruses, belonging to the family Flexiviridae. Transmission occurs mechanically, with viruses in this genus causing mosaic and ringspot symptoms....
and the family Flexiviridae
Flexiviridae

The Flexiviridae are a family of viruses. The viruses are filamentous and named for being highly flexible. This family was described in the literature in 2004 after being approved as a new Family by the International Committee on Taxonomy of Viruses based on Molecular phylogeny of proteins ....
. WClMV is a filamentous, flexuous rod, 480 nm in length and 13 nm wide.

The virus is a monopartite strand of positive-sense, single-stranded RNA surrounded by a capsid made from a single viral encoded protein. The genome has been completely sequenced and is 5845 nucleotides long. It is transmitted by mechanical inoculation, contact between plants and sometimes by seed (6% in Trifolium pretense). No insect vector is known.
Host Range and Geographic Distribution

Its major host is clover (Trifolium spp) . It first reported in Trifolium repens in 1935 . In the western United States and south western Canada it had been found in clover in a mixed infection with another potexvirus, Clover yellow mosaic virus
Clover yellow mosaic virus

Clover yellow mosaic virus is a plant pathogenic virus in the genus Potexvirus and the virus family Flexiviridae. Its flexous rod-shaped paticles measure about 539 nm in length....
. It is also know to infect peas (Pisum sativum), faba beans (Vicia faba
Vicia faba

Vicia faba, the Broad Bean, Fava Bean, Faba Bean, Field Bean, Bell Bean or Tic Bean is a species of legume native to north Africa and southwest Asia, and extensively cultivated elsewhere....
), green beans (Phaseolus vulgaris), cowpea
Cowpea

The Cowpea is one of several species of the widely cultivated genus Vigna. Four cultivated subspecies are recognised:*Vigna unguiculata subsp....
(Vigna unguiculata), cucumbers (Cucumis sativus), squash ( Cucurbita
Cucurbita

Cucurbita is a genus in the gourd family Cucurbitaceae first cultivated in the Americas and now used in many parts of the world. It includes species grown for their fruit and edible seeds , as well as some species grown only as gourds....
pepo ), and tomatoes (Lycopersicon esculentum) .

This virus is believed to be distributed in temperate regions worldwide .

Diagnosis

Potexviruses make banded inclusions made up of layers of parallel virus particles. These inclusions can be seen in the light microscope in leaf strips of infected plant tissue stained with Azure A or Orange-Green stains . The banded inclusions produced by WClMV are disrupted by the process of staining for inclusions. Those of ClYMV are not and thus inclusions can be used to distinguish these two potexviruses. Antiserum and sequence data are also available for the diagnosis of this virus.

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