Barley yellow dwarf virus-PAV in Brazil: seasonal fluctuation and biological characteristics
TLDR
The population dynamics of the virus was similar in aphids and plants, with peaks in the winter crop season, and several common vector species efficiently transmit BYDV-PAV may explain why it is the dominant virus species in the "yellow dwarf pathosystem" in Southern Brazil.Abstract:
The yellow dwarf disease in winter cereal crops is caused by species of Barley yellow dwarf virus (BYDV) and Cereal yellow dwarf virus (CYDV) (Luteoviridae). These viruses are transmitted to grasses (Poaceae) by aphids (Aphididae) and the frequency of virus population is affected by oscillations in the vector and host populations. Seasonal fluctuations of BYDV-PAV, BYDV-MAV, and CYDV-RPV in aphids and grasses were analyzed in corn in the summer, and wheat and oat plots in the winter in Coxilha, RS, Brazil. Among the aphids collected, 12.7% transmitted B/CYDV, and 92.6% of those aphids were Rhopalosiphum padi while 7.4% were Sitobion avenae. The viruses that R. padi transmitted were BYDV-PAV (95.4%), CYDV-RPV (2.3%), and BYDV-MAV+PAV (2.3%), while S. avenae only transmitted BYDV-PAV. Among the wheat and oat plants collected, 65.8% were seropositive, all of which were infected with BYDV-PAV and 0.7% of which were also infected with BYDV-MAV. The population dynamics of the virus was similar in aphids and plants, with peaks in the winter crop season. The 35 isolates of BYDV-PAV analyzed were able to infect wheat and oat, being transmitted by R. padi (EF=94.4%), S. avenae (EF=76.1%), and M. dirhodum (EF=63.4%). They were not transmitted by S. graminum or S. maydis. Since several common vector species efficiently transmit BYDV-PAV, this may explain why it is the dominant virus species in the "yellow dwarf pathosystem" in Southern Brazil.read more
Citations
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Journal ArticleDOI
Regional susceptibilities of Rhopalosiphum padi (Hemiptera: Aphididae) to ten insecticides
TL;DR: Correlation analysis indicated positive and significant correlations between R. padi resistance levels to thiamethoxam and beta-cypermethrin, and rotation of insecticide classes to delay the onset of high levels of resistance.
Journal ArticleDOI
Cereal aphids differently affect benzoxazinoid levels in durum wheat
TL;DR: Diverse metabolic responses of durum wheat seedlings to cereal aphid feeding are revealed and a partial correlation between the induction of benzoxazinoids and aphid reproduction is shown.
Journal ArticleDOI
Host plant resistance in wheat to barley yellow dwarf viruses and their aphid vectors: a review.
TL;DR: In this article, the authors describe the main sources of resistance, discuss the challenges and opportunities for incorporating the resistance in wheat breeding programs and present a workflow to breed for BYDV and its vectors in wheat.
Journal ArticleDOI
Barley yellow dwarf viruses: infection mechanisms and breeding strategies
Shormin Choudhury,Shormin Choudhury,Hongliang Hu,Holger Meinke,Sergey Shabala,GC Westmore,Philip J. Larkin,Meixue Zhou +7 more
TL;DR: Current information on known resistance genes, molecular markers and the use of transgenic techniques in breeding of BYD resistant varieties are summarized and Cereal yellow dwarf viruses are discussed as both BYDV and CYDV belong to the family Luteoviridae.
Journal ArticleDOI
Population Growth and Damage Caused by Rhopalosiphum padi (L.) (Hemiptera, Aphididae) on Different Cultivars and Phenological Stages of Wheat
Marcoandre Savaris,S Lampert,J. R. Salvadori,Douglas Lau,Paulo Roberto Valle da Silva Pereira,M A Smaniotto +5 more
TL;DR: Although infestation caused a reduction in the grain yield of the three cultivars, this effect was lower for BRS Timbaúva, and the cultivar Embrapa 16 supported higher infestations and was more tolerant to damage than the BRS Guabiju.
References
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Journal ArticleDOI
Barley yellow dwarf viruses.
W A Miller,L Rasochová +1 more
TL;DR: This review focuses primarily on four research areas in which progress has been most rapid on evidence supporting reclassification of BYDVs into two genera, elucidation of gene function and novel mechanisms controlling gene expression, initial forays into understanding the complex interactions between BYDV virions and their aphid vectors, and replication of a ByDV satellite RNA.
Journal ArticleDOI
Epidemiology of Barley Yellow Dwarf: A Study in Ecological Complexity
M. E. Irwin,J. M. Thresh +1 more
TL;DR: Investigating virus variants, their plant hosts and vectors, and elucidating the confounding resultant interactions in diverse and fluctuating environments in different regions of the world is an extremely difficult task, but one that must be undertaken to gain an understanding of the pathosystem.
Journal ArticleDOI
Variation in Transmission Efficiency Among Barley yellow dwarf virus-RMV Isolates and Clones of the Normally Inefficient Aphid Vector, Rhopalosiphum padi.
TL;DR: Results indicate that R. padi can play a significant role in the epidemiology of BYDV-RMV, and may be especially significant in regions where corn is a major source of virus and of aphids that can carry virus into a fall-planted wheat crop.