| nucleotide sequence analysis of the genomes of the mav-ps1 and p-pav isolates of barley yellow dwarf virus. | the mav-ps1 and p-pav isolates of barley yellow dwarf virus (bydv) are serologically related, but not identical. both are transmitted by the aphid macrosiphum avenae, but p-pav is also transmitted by rhopalosiphum padi. to evaluate the basis for these and other differences, overlapping clones from cdna libraries representing the genome of each isolate were characterized by restriction enzyme digestion and by hybridization, and subsequently sequenced. each genome has six positive strand open read ... | 1992 | 1538199 |
| use of enzyme amplification in an elisa to increase sensitivity of detection of barley yellow dwarf virus in oats and in individual vector aphids. | a new technique of alkaline phosphatase amplification in an elisa (amplified elisa) was used to increase the sensitivity of detection of barley yellow dwarf virus (bydv) from oat plant sap and in individual vector aphids. amplified elisa differs from conventional direct double antibody sandwich elisa (das-elisa) in the enzyme substrate reaction. the bound enzyme-labelled antibody catalyzes the conversion of nadp to nad which is then used in a secondary enzyme-mediated cyclic reaction producing a ... | 1987 | 3558700 |
| variation within rhopalosiphum padi and transmission of barley yellow dwarf virus by clones of four aphid species. | | 1966 | 5919230 |
| in vitro interactions of the aphid endosymbiotic syml chaperonin with barley yellow dwarf virus. | barley yellow dwarf virus (bydv)-vector relationships suggest that there are specific interactions between bydv virions and the aphid's cellular components. however, little is known about vector factors that mediate virion recognition, cellular trafficking, and accumulation within the aphid. symbionins are molecular chaperonins produced by intracellular endosymbiotic bacteria and are the most abundant proteins found in aphids. to elucidate the potential role of symbionins in bydv transmission, w ... | 1997 | 8985385 |
| seasonal abundance of aphids (homoptera: aphididae) in wheat and their role as barley yellow dwarf virus vectors in the south carolina coastal plain. | aphid (homoptera: aphididae) seasonal flight activity and abundance in wheat, triticum aestivum l., and the significance of aphid species as vectors of barley yellow dwarf virus were studied over a nine-year period in the south carolina coastal plain. four aphid species colonized wheat in a consistent seasonal pattern. greenbug, schizaphis graminum (rondani), and rice root aphid, rhopalosiphum rufiabdominalis (sasaki), colonized seedlingwheat immediately after crop emergence, with apterous colon ... | 2001 | 11332833 |
| the effect of natural enemies on the spread of barley yellow dwarf virus (bydv) by rhopalosiphum padi (hemiptera: aphididae). | the effects of two natural aphid enemies, adult coccinella septempunctata linneaus, a predator, and aphidius rhopalosiphi de stefani perez, a parasitoid, on spread of barley yellow dwarf virus (bydv) transmitted by the bird cherry-oat aphid, rhopalosiphum padi (linnaeus) were studied under laboratory conditions. predators or parasitoids were introduced to trays of durum wheat seedlings and the patterns of virus infection were observed after two, seven and 14 days of exposure. more plants were in ... | 2001 | 11587627 |
| life history of the bird cherry-oat aphid, rhopalosiphum padi (homoptera: aphididae), on transgenic and untransformed wheat challenged with barley yellow dwarf virus. | the life history of rhopalosiphum padi (l.) was monitored on transgenic and untransformed (soft white winter wheat plants that were infected with barley yellow dwarf virus (bldv), noninfected, or challenged with virus-free aphids under laboratory conditions. two transgenic soft white winter wheat genotypes (103.1j and 126.02) derived from the parental variety lambert and expressing the barley yellow dwarf virus coat protein gene, and two untransformed varieties, virus-susceptible lambert and vir ... | 2004 | 15154437 |
| variation in barley yellow dwarf virus transmission efficiency by rhopalosiphum padi (homoptera: aphididae) after acquisition from transgenic and nontransformed wheat genotypes. | the effects of different acquisition access periods (aaps) and inoculation access periods (iaps) on the transmission efficiency of barley yellow dwarf luteovirus (bydv) by rhopalosiphum padi (l.) (homoptera: aphididae) after feeding on transgenic or nontransformed wheat, triticum aestivum l., genotypes were studied. three wheat genotypes were tested as virus sources: virus-susceptible 'lambert' and 'lambert'-derived transgenic lines 103.1j and 126.02, which express the bydv-pav coat protein gene ... | 2004 | 15666729 |
| evaluation of oat cultivars and lines under infection with barley yellow dwarf virus. | thirteen domestic and foreign oat cultivars and eight breeding lines bred from the university of illinois were evaluated for resistance to barley yellow dwarf (byd) using artificial inoculation with rhopalosiphum padi viruliferous for an isolate of barley yellow dwarf virus-pav endemic to moscow region origin. cultivar blaze and six illinois lines showed the best grain yields under disease pressure that resembled a byd epidemic. | 2004 | 15756843 |
| economic evaluation of the effects of planting date and application rate of imidacloprid for management of cereal aphids and barley yellow dwarf in winter wheat. | the effects of planting date and application rate of imidacloprid for control of schizaphis graminum rondani, rhopalosiphum padi l. (homoptera: aphididae), and barley yellow dwarf virus (bydv) in hard red winter wheat were studied. the first experiment was conducted from 1997 to 1999 at two locations and consisted of three planting dates and four rates of imidacloprid-treated seed. the second experiment was conducted from 2001 to 2002 in stillwater, ok, and consisted of two varieties of hard red ... | 2005 | 15765670 |
| a simple wax-embedding method for isolation of aphid hemolymph for detection of luteoviruses in the hemocoel. | a protocol for isolating hemolymph from viruliferous aphids has been developed. this method uses warm melted wax to immobilize the aphid. following removal of a hind leg, the hemolymph can be collected readily. flushing with rnase-free water allows for collection of sufficient hemolymph for rna extraction from individual aphids. the extracted rna was successfully used for detection of barley yellow dwarf virus (bydv) and pea enation mosaic virus (pemv) from individual viruliferous rhopalosiphum ... | 2006 | 16307802 |
| influence of aphid species and barley yellow dwarf virus on soft red winter wheat yield. | yield loss in soft red winter wheat, triticum aestivum l., caused by aphid-transmitted barley yellow dwarf virus (family luteoviridae, genus luteovirus, bydv) was measured over a 2-yr period in central missouri. rhopalosiphum padi (l.) was the most common and economically important species, accounting for > 90% of the total aphids. schizaphis graminum (rondani), rhopalosiphum maidis (fitch), and sitobion avenae (f.) made up the remainder of the aphids. aphid numbers peaked at wheat stem elongati ... | 2005 | 16539127 |
| insect infestations, incidence of viral plant diseases, and yield of winter wheat in relation to planting date in the northern great plains. | planting date effects on arthropod infestation and viral plant disease are undocumented for winter wheat, triticum aestivum l., in south dakota and the northern great plains. winter wheat was planted over three dates (early, middle, and late; generally from late august to late september) to determine the effect on abundance of insect pests, incidence of plant damage, incidence of viral plant disease, and grain yield. the study was conducted simultaneously at two sites in south dakota over three ... | 2005 | 16539128 |
| barley yellow dwarf virus: phenotypic mixing and vector specificity. | although the aphid rhopalosiphum padi does not regularly transmit the mav isolate of barley yellow drawf virus from singly infected oats, it often transmits mav, together with the serologically unrelated rpv isolate, from plants doubly infected by mav and rpv. vector specificity of the virus isolates appears to be a function of the virus capsid. some mav nucleic acid becomes coated with rpv capsid protein during simultaneous synthesis of the two isolates in the doubly infected plant. | 1970 | 17742616 |
| cytopathological evidence for the division of barley yellow dwarf virus isolates into two subgroups. | the cytological survey of oat cells in tissue infected with different aphid-specific or aphid-nonspecific isolates of barley yellow dwarf virus (bydv) was concluded in this study with the examination of the alterations induced by schizaphis graminum-specific and s. graminum-nonspecific isolates. cytological alterations were similar with all four isolates examined, except that proliferated membranous inclusions, common with three of the isolates, were absent with s. graminum-nonspecific isolate 6 ... | 1979 | 18627893 |
| vascular cell alterations and predisposed xylem infection in oats by inoculation with paired barley yellow dwarf viruses. | electron microscope studies of tissue doubly infected with sitobion avenae-specific and rhopalosiphum padi-specific variants of barley yellow dwarf virus revealed four types of alteration patterns in infected phloem cells not previously observed in tissue infected with either isolate alone. cells with alteration patterns similar to those in tissue singly infected with either variant were also present. double infections with isolates mav (s. avenae-specific) and rpv (r. padi-specific) predisposed ... | 1981 | 18635099 |
| variation in transmission efficiency among barley yellow dwarf virus-rmv isolates and clones of the normally inefficient aphid vector, rhopalosiphum padi. | the rmv strain of barley yellow dwarf virus (bydv-rmv) is an unassigned member of the luteoviridae that causes barley yellow dwarf in various cereal crops. the virus is most efficiently vectored by the aphid rhopalosiphum maidis, but can also be vectored with varying efficiency by r. padi and schizaphis graminum. field collections of alate aphids migrating into the emerging winter wheat crop in the fall of 1994 in central new york identified a high proportion of r. padi transmitting bydv-rmv. th ... | 2001 | 18944037 |
| aphid abundance on cereals in autumn predicts yield losses caused by barley yellow dwarf virus. | abstract barley yellow dwarf virus (bydv) damage to winter cereals and population dynamics of the aphid rhopalosiphum padi during fall were monitored in fields during 10 years at various locations in the northern half of france. logistic regression was used to examine whether a simple risk probability algorithm based only on the autumnal population dynamics of r. padi can accurately predict yield losses caused by bydv and, therefore, the need for insecticide treatment. results showed that the ar ... | 2003 | 18944319 |
| analyzing and modeling temporal disease progress of barley yellow dwarf virus serotypes in barley fields. | abstract population dynamics of padi avenae (pav), macrosiphum avenae (mav), and rhopalosiphum padi (rpv) virus serotypes of barley yellow dwarf virus (bydv) and of their main aphid vectors were studied in winter barley (hordeum vulgare) fields for three successive years in western france. an epidemiological model of the spread of viruses in the field was developed based on vector populations as forcing variables and the population dynamics of each virus serotype. this model accurately simulated ... | 2000 | 18944507 |
| [damage of rhopalosiphum padi (l.) (hemiptera: aphididae) on wheat plants related to duration time and density of infestation]. | aphids are considered relevant pests on wheat either by direct damage through sap sucking or by indirect damage vectoring bydv (barley yellow dwarf virus). rhopalosiphum padi l. has been observed infesting wheat fields with an increasing frequency. the knowledge and the available technology, besides being more related to other aphids species already recognized as pests, they are insufficient to control the specific problem of r. padi. thus, this work evaluated the effects of feeding duration and ... | 2008 | 19061045 |
| rhopalosiphum padi (hemiptera: aphididae) responses to volatile cues from barley yellow dwarf virus-infected wheat. | in choice bioassays, rhopalosiphum padi l. nonviruliferous apterae preferentially locate near volatile organic compounds (vocs) emitted from barley yellow dwarf virus (bydv)-infected wheat plants compared with vocs from noninfected plants. however, the specific vocs responsible for r. padi responses are unknown. it is unclear also if r. padi responses to bydv-infected wheat are caused by arrestment or attraction. additionally, the responses of viruliferous apterae and nonviruliferous alate to by ... | 2009 | 19508794 |
| the influence of virus-induced changes in plants on aphid vectors: insights from luteovirus pathosystems. | plant virus infection can alter the suitability of host plants for their aphid vectors. most reports indicate that virus-infected plants are superior hosts for vectors compared to virus-free plants with respect to vector growth rates, fecundity and longevity. some aphid vectors respond preferentially to virus-infected plants compared to virus-free ones, while others avoid infected plants that are inferior hosts. thus, it appears vectors can exploit changes in host plant quality associated with v ... | 2011 | 21549769 |
| species composition of aphid vectors (hemiptera: aphididae) of barley yellow dwarf virus and cereal yellow dwarf virus in alabama and western florida. | yellow dwarf is a major disease problem of wheat, triticum aestivum l., in alabama and is estimated to cause yield loss of 21-42 bu/acre. the disease is caused by a complex of viruses comprising several virus species, including barley yellow dwarf virus-pav and cereal yellow dwarf virus-rpv. several other strains have not yet been classified into a specific species. the viruses are transmitted exclusively by aphids (hemiptera:aphididae). between the 2005 and 2008 winter wheat seasons, aphids wer ... | 2011 | 21882679 |
| distribution of barley yellow dwarf virus-pav in the sub-antarctic kerguelen islands and characterization of two new luteovirus species. | a systematic search for viral infection was performed in the isolated kerguelen islands, using a range of polyvalent genus-specific pcr assays. barley yellow dwarf virus (bydv) was detected in both introduced and native grasses such as poa cookii. the geographical distribution of bydv and its prevalence in p. cookii were analyzed using samples collected from various sites of the archipelago. we estimate the average prevalence of bydv to be 24.9% in p. cookii, with significant variability between ... | 2013 | 23825645 |
| preference by a virus vector for infected plants is reversed after virus acquisition. | pathogens and their vectors can interact either directly or indirectly via their shared hosts, with implications for the persistence and spread of the pathogen in host populations. for example, some plant viruses induce changes in host plants that cause the aphids that carry these viruses to settle preferentially on infected plants. furthermore, relative preference by the vector for infected plants can change to a preference for noninfected plants after virus acquisition by the vector, as has re ... | 2014 | 24269348 |
| integrative proteomics to understand the transmission mechanism of barley yellow dwarf virus-gpv by its insect vector rhopalosiphum padi. | barley yellow dwarf virus-gpv (bydv-gpv) is transmitted by rhopalosiphum padi and schizaphis graminum in a persistent nonpropagative manner. to improve our understanding of its transmission mechanism by aphid vectors, we used two approaches, isobaric tags for relative and absolute quantitation (itraq) and yeast two-hybrid (yth) system, to identify proteins in r. padi that may interact with or direct the spread of bydv-gpv along the circulative transmission pathway. thirty-three differential aphi ... | 2015 | 26161807 |
| resistance of select winter wheat (triticum aestivum) cultivars to rhopalosiphum padi (hemiptera: aphididae). | the bird cherry-oat aphid (rhopalosiphum padi l.) is a global pest of wheat and vectors some of the most damaging strains of barley yellow dwarf virus (bydv). in years of heavy r. padi infestation, r. padi and bydv together reduce wheat yields by 30-40% in kansas and other states of the u.s. great plains wheat production area. cultivation of wheat cultivars resistant to r. padi can greatly reduce production costs and mitigate r. padi-bydv yield losses, and increase producer profits. this study i ... | 2017 | 28854661 |
| crop-associated virus reduces the rooting depth of non-crop perennial native grass more than non-crop-associated virus with known viral suppressor of rna silencing (vsr). | as agricultural acreage expanded and came to dominate landscapes across the world, viruses gained opportunities to move between crop and wild native plants. in the midwestern usa, virus exchange currently occurs between widespread annual poaceae crops and remnant native perennial prairie grasses now under consideration as bioenergy feedstocks. in this region, the common aphid species rhopalosiphum padi l. (the bird cherry-oat aphid) transmits several virus species in the family luteoviridae, inc ... | 2017 | 28688850 |
| cloning of eight rhopalosiphum padi (hemiptera: aphididae) nachr subunit genes and mutation detection of the β1 subunit in field samples from china. | the bird cherry-oat aphid, rhopalosiphum padi (l.), is one of the most important wheat pests. this aphid damages through direct feeding and by transmitting the barley yellow dwarf virus (bydv). both types of damage significantly reduce the quality and yield of wheat crops globally. insecticides are the primary method of controlling the bird cherry-oat aphid in china, yet this aphid species has developed resistance to different types of insecticides, especially organophosphates and carbamates. in ... | 2016 | 27521918 |
| virus infection mediates the effects of elevated co2 on plants and vectors. | atmospheric carbon dioxide (co2) concentration has increased significantly and is projected to double by 2100. to increase current food production levels, understanding how pests and diseases respond to future climate driven by increasing co2 is imperative. we investigated the effects of elevated co2 (eco2) on the interactions among wheat (cv. yitpi), barley yellow dwarf virus and an important pest and virus vector, the bird cherry-oat aphid (rhopalosiphum padi), by examining aphid life history, ... | 2016 | 26941044 |
| interactions between metopolophium festucae cerealium (hemiptera: aphididae) and barley yellow dwarf virus (bydv-pav). | interactions between an invasive aphid, metopolophium festucae (theobald) subsp. cerealium, and barley yellow dwarf virus (bydv-pav) were studied under laboratory conditions. m. festucae cerealium is an economic pest of wheat and barley that has recently been found in high population densities in wheat in the pacific northwest of the united states. bydv-pav is the most prevalent and injurious species of bydv worldwide and in the pacific northwest. although m. festucae sensu stricto (theobald 191 ... | 2016 | 26896673 |
| genes involved in barley yellow dwarf virus resistance of maize. | the results of our study suggest that genes involved in general resistance mechanisms of plants contribute to variation of bydv resistance in maize. with increasing winter temperatures in europe, barley yellow dwarf virus (bydv) is expected to become a prominent problem in maize cultivation. breeding for resistance is the best strategy to control the disease and break the transmission cycle of the virus. the objectives of our study were (1) to determine genetic variation with respect to bydv res ... | 2014 | 25261982 |
| sequencing and validation of reference genes to analyze endogenous gene expression and quantify yellow dwarf viruses using rt-qpcr in viruliferous rhopalosiphum padi. | the bird cherry-oat aphid (rhopalosiphum padi), an important pest of cereal crops, not only directly sucks sap from plants, but also transmits a number of plant viruses, collectively the yellow dwarf viruses (ydvs). for quantifying changes in gene expression in vector aphids, reverse transcription-quantitative polymerase chain reaction (rt-qpcr) is a touchstone method, but the selection and validation of housekeeping genes (hkgs) as reference genes to normalize the expression level of endogenous ... | 2014 | 24810421 |
| plant viruses alter insect behavior to enhance their spread. | pathogens and parasites can induce changes in host or vector behavior that enhance their transmission. in plant systems, such effects are largely restricted to vectors, because they are mobile and may exhibit preferences dependent upon plant host infection status. here we report the first evidence that acquisition of a plant virus directly alters host selection behavior by its insect vector. we show that the aphid rhopalosiphum padi, after acquiring barley yellow dwarf virus (bydv) during in vit ... | 2012 | 22896811 |
| resistance of wheat lines to rhopalosiphum padi (hemiptera: aphididae) under laboratory conditions. | bird cherry-oat aphid, rhopalosiphum padi (l.), a polyphagous species with a nearly worldwide distribution, is an important pest of wheat as well as the main vector of barley yellow dwarf virus. we evaluated the resistance categories of eight wheat lines including antibiosis, antixenosis, and tolerance against r. padi under laboratory conditions. the wheat lines tested were erwyt 88-8, erwyt 87-6, and erwyt 87-4 (resistant); erwyt 87-1, erwyt 87-20, and erwyt 88-11 (susceptible); erwyt 88-12 and ... | 2012 | 22606831 |