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  • 1
    Electronic Resource
    Electronic Resource
    Barley yellow dwarf viruses in Japanese pasture grasses and lack of correlation with the presence of fungal endophytes (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 42 (1993), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Pasture grasses from temperate Japan were tested for infection with barley yellow dwarf viruses (BYDVs) and fungal endophytes. BYDVs from both the MAV and RPV subgroups were detected, but no symptoms attributable to BYDV infection were observed. Not all isolates from the MAV subgroup could be clearly discriminated as MAV or PAV solely on ELISA results, and may have been intermediate serotypes or mixed infections. BYDVs were found to infect fescue (Festuca arundinacea: 17%), ryegrass (Lolium perenne: 41%), timothy (Phleum pratense: 94%) and Poa spp. (20%). Fescue and ryegrass were predominantly infected with RPV and PAV, respectively. The small collections of Poa spp. were only infected with PAV, while timothy was only tested for MAV subgroup viruses. In fescue 26% of tillers were infected with Acremonium coenophialum, and 60% of ryegrass tillers from an ecotype collection were infected with Acremonium lolii. There was no correlation between BYDV infection and the presence of endophytes for the above species or for Epichloe typhina-infected (50%) timothy. An ELISA test for A. lolii did not detect A. coenophialum in fescue or E. typhina in timothy but showed good agreement with epidermal staining of A. lolii in ryegrass leaf sheaths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1993.tb01465.x
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  • 2
    Electronic Resource
    Electronic Resource
    Pasture ecology of barley yellow dwarf viruses at Sandford, Tasmania (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 37 (1988), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Samples of cocksfoot (Dactylis glomerata), fescue (Festuca arundinacea), phalaris (Phalaris aquatica) and ryegrass (Lolium perenne) were collected every 4-6 weeks for 2.5 years from two sets of replicated plots, one on a heavy soil and the other on a light soil 200 m away. Rhopalosiphum padi was the predominant aphid species; it was more frequent at the heavy soil site. Sitobion fragariae and Metopolophium dirhodum occurred infrequently during the last 12 months of the survey.Only PAV (57%), RPV (26%) and mixed infections (17%) of these barley yellow dwarf viruses were detected in the 4100 tillers sampled. Virus incidence increased over the sampling period and was consistently higher at the heavy soil site. RPV only became frequent during the last 12 months.Virus incidence was higher in fescue (21%) and ryegrass (27%), in which PAV predominated, than in cocksfoot (6%) and phalaris (7%), in which RPV finally predominated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1988.tb02113.x
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  • 3
    Electronic Resource
    Electronic Resource
    Further studies on turnip yellow mosaic tymovirus isolates from an endemic Australian Cardamine (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 34 (1985), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Native and introduced species of Cardamine and other brassicas were collected from various parts of south-eastern Australia and tested for sap-transmitted viruses. Isolates of turnip yellow mosaic virus (TYMV-Cd) were obtained from a robust sward-forming (SF) species, C. lilacina, that is an endemic species and restricted to the high glacial cirques of the Kosciusko alpine area. At two sites (Blue Lake and Club Lake) 22% of the plants were infected. An undescribed species of flightless pill beetle, Pedilophorus (Byrrhidae), was found on the C. lilacina SF plants. They preferred feeding on leaf discs infected with TYMV-Cd rather than on virus-free leaf discs and transmitted the virus for 48 h to seedlings of C. lilacina SF (2.5%) or Chinese cabbage (10%).The pattern of distribution of TYMV-Cd and its close association with Pedilophorus suggested that it is not a recent migrant to the area. The possible time of its arrival is discussed.A carlavirus was isolated from up to 4% of three other native highland Cardamine species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1985.tb01404.x
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  • 4
    Electronic Resource
    Electronic Resource
    A taxonomic study of the host ranges of tymoviruses (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 33 (1984), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Published data on the susceptibility of plant species to 18 tymoviruses were collated. These data showed that tymoviruses infected more species from the family of their natural field host than species from other families. The data also indicated that tymoviruses infected a greater proportion of species from the same primary division of the dicotyledons (crassinucellate or tenuinucelate) as their natural host than other species, but the correlation was not statistically significant.The susceptibility of 18 crassinucellate and 18 tenuinucellate test plant species to 10 tymoviruses was determined. The viruses infected about three times more plant species from the primary taxonomic division that contained the family of their field host than species from the other division; this difference was statistically significant.The separation of tymoviruses into two groups based on the taxonomic division containing their natural hosts and most of their experimental hosts correlates broadly with a classification of the tymoviruses based on the serological relationships of their particle coat proteins.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1984.tb01328.x
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  • 5
    Electronic Resource
    Electronic Resource
    Incidence of Acremonium lolii and lack of correlation with barley yellow dwarf viruses in Tasmanian perennial ryegrass pastures (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Plant pathology 41 (1992), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The perennial ryegrass endophyte Acremonium lolii occurred in all ryegrass (Lolium perenne) pastures sampled in Tasmania. Cultivars tested included Ellett, Martlet, Tasdale, Tasmanian No. 1 and Victorian. The range in incidence was 4–94% (average 66%). Many pastures more than 4 years old caused perennial ryegrass staggers syndrome in livestock, and the range in incidence in these pastures was 79–94%. There was no correlation, positive or negative, between barley yellow dwarf virus infection and the incidence of A. lolii. There was good agreement between ELISA and microscopic examination of epidermal strips. However unlike previous studies, the ELISA test was specific for A. lolii and did not detect Acremonium coenophialum, the endophyte of tall fescue.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3059.1992.tb02312.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of plant hormones on white clover mosaic potexvirus double-stranded RNA (2000)
    Oxford, UK : Blackwell Science Ltd
    Plant pathology 49 (2000), S. 0 
    Details
    ISSN: 1365-3059
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The double-stranded RNAs (dsRNA) produced during the replication of white clover mosaic potexvirus (WClMV) in the primary leaves of Phaseolus vulgaris during the 10 days following inoculation were investigated. Replication of a large dsRNA fragment (dsRNA 1) occurred within 24 h of inoculation and probably represents the replicative form of the genomic RNA. A second dsRNA fragment (dsRNA 5) appeared at day 3, and four other dsRNAs were detected from day 5; the putative functions of these are unknown, however their appearance coincided with a rapid increase in virus titre. Hormone treatments that inhibited virus replication altered the production of these dsRNAs. Dihydrozeatin, jasmonic acid and salicylic acid inhibited production of all dsRNAs except dsRNA 1, while 1-amino-1-cyclopropane carboxylic acid reduced the levels of dsRNAs produced but did not alter the pattern of expression.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-3059.2000.00476.x
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  • 7
    Electronic Resource
    Electronic Resource
    Distribution and diversity of New Zealand isolates of ryegrass mosaic virus (1999)
    Springer
    Archives of virology 144 (1999), S. 2059-2064 
    Details
    ISSN: 1432-8798
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary.  Sequences from the coat protein cistron of five ryegrass mosaic virus (RgMV) isolates indicated the presence of two distinct strains in New Zealand. The nucleotide differences between the strains, and their distribution, suggested that both strains were introduced recently, either as a mixed infection or as two independent introductions. The relationship between these New Zealand strains and other strains and isolates of RgMV, and their potential severity is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007050050727
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