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Barley yellow mosaic virus : ウィキペディア英語版 | Barley yellow mosaic virus
Barley yellow mosaic virus is plant pathogenic virus that causes the yellow mosaic disease of barley. Its shape is categorized as being flexuous filamentous, with lengths of 275 and 550 nanometers. The virus has a limited host range, and barley appears to be the only known susceptible host.〔Ed. M.J. Adams. (1975). Barley Yellow Mosaic Virus. Descriptions of Plant Viruses. Web. http://www.dpvweb.net/dpv/showdpv.php?dpvno=143〕 The virus is transmitted via ''Polymyxa graminis'', which is a plasmodiophorid protist, through the resting spores that survive in the soil, and eventually zoospores.〔You, Y. and Shirako, Y. (2013), Evaluation of host resistance to Barley yellow mosaic virus infection at the cellular and whole-plant levels. Plant Pathology, 62: 226–232.〕 Eastern Asia is the most affected region, but the virus can be found worldwide. Current agricultural practices have been ineffective at eliminating the virus, but breeding resistance appears to be the only way to help reduce the disease.〔Iida, Y., Ban, T., and Konishi, T. (DATE). Linkage analysis of the rym6 resistance gene to Japanese strain II of barley yellow mosaic virus (BaYMV-II) in barley. Barley Genetics Newsletter, 29: 31-33.〕 ==Hosts and Symptoms==
Barley (''Hordeum vulgare'') is the only current known host for the virus. Other species of ''Hordeum'' have been experimentally innocultated and exhibited similar symptoms, but this has since been categorized as a different strain of disease called barley mild mosaic virus.〔 When dealing with viruses, it is important to understand that symptoms are not reliable in diagnosing the specific virus. That being said, the signature symptom exhibited by the barley from the virus is a yellowing and mosaic flecking of the youngest leaves that often appears in the winter or early spring.〔Brunt, A.A., Crabtree, K., Dallwitz, M.J., Gibbs, A.J., Watson, L. and Zurcher, E.J. (eds.) (1996). Plant Viruses Online: Descriptions and Lists from the VIDE Database. Version: 20 August 1996.' URL http://biology.anu.edu.au/Groups/MES/vide〕 Early on the plant leaves begin to show a pale green color, and over time the changes become more drastic with severe yellowing and mosaic patterns. In addition, leaf curl, stunting, and necrosis can all be observed.〔You, Y., and Shirako, Y. (2012). Influence of amino acid position 132 in VPg on replication and systemic infection of barley yellow mosaic virus. Virus Research, 166: 121-124〕 The symptoms are categorized as systemic, due to the spread of the disease throughout the plant.〔 Once the virus enters the plant through the root cells via ''Polymyxa graminis'' it is able to multiply and spread throughout the plant.〔 The symptoms arise due to the virus's ability to hack into the plant cells' machinery, which disrupts the normal cycle of the plant.
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