Author
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Robertson, Nancy |
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Submitted to: Virus Diseases of the Poaceae
Publication Type: Book / Chapter Publication Acceptance Date: 2/20/2001 Publication Date: 9/20/2004 Citation: Robertson, N.L. 2004. Barley yellow streak mosaic virus. Viruses of Poaceae. Interpretive Summary: Technical Abstract: Barley yellow streak mosaic virus (BaYSMV) was discovered in barley from Montana, U.S.A. in 1982, and later reported in several western states, Alaska, and Alberta, Canada. Barley plants show chlorotic streaks, stripes, and dashes parallel to the leaf veins and varying degrees of stunting; increased protein concentration of the seed may occur. Yield losses reaching 100% have been reported when seedlings are infected with BaYSMV and infested with the brown wheat mite vector, Petrobia latens. The mite’s diapausal eggs are the overwintering host of BaYSMV, bridging the virus from summer/fall to spring plant infections. Disease incidence and severity are greatest in recrop barley and non-irrigated crops under drought conditions. The natural plant host range include Hordeum vulgare and Triticum aestivum, and three grasses, Echinochloa crusgalli, Lolium persicum, and Setaria viridis. The virus can be transmitted manually to Nicotiana and Chenopodium and is maintained in N. benthamiana. No resistant barley cultivars are known, and chemical control for the mite vector is not cost effective. BaYSMV is morphologically unique among plant viruses, resembling some insect and animal viruses by containing flexuous, filamentous particles c.64 nm in diameter and varying lengths between 127 and 4,000 nm. Particles usually have an outer lipid-like envelope and may contain internal electron dense material and translucent areas. BaYSMV is not known to be serologically related to other viruses and genomic sequence information is required before it is placed into a defined taxonomic group. |
