scholarly journals Differences in Aceria tosichella population responses to wheat resistance genes and wheat virus transmission

2019 ◽  
Vol 13 (6) ◽  
pp. 807-818 ◽  
Author(s):  
Luaay Khalaf ◽  
Wen-Po Chuang ◽  
L. M. Aguirre-Rojas ◽  
Peter Klein ◽  
C. Michael Smith
Keyword(s):  
Resistance Gene ◽  
Resistance Genes ◽  
Wheat Yield ◽  
The United States ◽  
High Plains ◽  
Yield Losses ◽  
Wheat Varieties ◽  
Wheat Production ◽  
Wheat Curl Mite ◽  
Aceria Tosichella

Abstract Severe winter wheat yield losses due to infestations of wheat curl mite, Aceria tosichella Keifer, and mite-transmitted viruses occur in wheat production areas of the United States and Canada. Mite infestation alone causes stunted, chlorotic plants in susceptible wheat varieties, and mites transmit Wheat Streak Mosaic (WSMV), High Plains Wheat Mosaic (HPWMoV), and Triticum Mosaic Virus (TriMV). Wheat curl mites were collected from 25 sites in Kansas, Missouri, Nebraska, Texas, North Dakota, and South Dakota in 2014 and 2015. At each site, mite virulence was determined to wheat plants harboring the Cmc2-, Cmc3-, or Cmc4 mite resistance gene; or Cmc4 plus the Wsm2 WSMV resistance gene. Mites collected from 92%, 36%, and 24% of sites were virulent to susceptible Jagger wheat plants (no Cmc), Cmc2, and Cmc3, respectively. The mega-population consisting of all 25 mite sub-populations was avirulent to 80% of plants containing Cmc4 + Wsm2 or Cmc4. WSMV, HPWMoV, or TriMV was present in mites at 76%, 16%, and 8% of the 25 sites, respectively. Our results will enable breeders to increase the efficiency of wheat production by releasing wheat varieties containing wheat curl mite resistance genes that reduce wheat yield losses.

scholarly journals Barley Varieties Stoneham and Sydney Exhibit Mild Antibiosis and Antixenosis Resistance to the Wheat Curl Mite, Aceria tosichella (Keifer)

Agronomy ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 748 ◽  
Author(s):  
Lina Maria Aguirre-Rojas ◽  
Luaay Kahtan Khalaf ◽  
Charles Michael Smith
Keyword(s):  
Cereal Crops ◽  
Feeding Damage ◽  
Yield Losses ◽  
Plant Tolerance ◽  
Cereal Crop ◽  
Wheat Varieties ◽  
Wheat Curl Mite ◽  
Crop Varieties ◽  
Aceria Tosichella ◽  
Antibiosis Resistance

The wheat curl mite, Aceria tosichella (Keifer), devastates cereal crops worldwide by direct feeding damage and transmission of several deadly viruses. Deployment of cereal crop varieties resistant to A. tosichella is key for reduction of crop yield losses, and management of this mite and associated viruses that it transmits. Barley varieties resistant to A. tosichella are not known to exist. The objectives of this study were to determine if A. tosichella resistance exists in the barley varieties Sydney and Stoneham, which are resistant to the Russian wheat aphid, Diuraphis noxia (Kurjumov), and, further, to determine which categories mediate the resistance. Categories of resistance to both A. tosichella biotypes were evaluated independently in non-choice and choice experiments using wheat varieties Ike and OK05312 as susceptible and resistant controls, respectively. Sydney barley displays mild antixenosis and antibiosis resistance to A. tosichella biotype 1 and 2, respectively. Stoneham barley exhibits only mild antibiosis to biotype 2. No evidence for plant tolerance was found in either barley variety to either mite biotype.

scholarly journals WATER USE EFFICIENCY, GROWTH AND YIELD OF WHEAT CULTIVATED UNDER COMPETITION WITH Setaria

2015 ◽  
Vol 33 (4) ◽  
pp. 679-687 ◽  
Author(s):  
M.Z. IHSAN ◽  
F.S. EL-NAKHLAWY ◽  
S.M. ISMAIL
Keyword(s):  
Drought Stress ◽  
Water Use Efficiency ◽  
Water Use ◽  
Harvest Index ◽  
Wheat Yield ◽  
Negative Association ◽  
Growth And Yield ◽  
Yield Losses ◽  
Wheat Production ◽  
Use Efficiency

ABSTRACT Understanding the critical period of weed competition is indispensable in the development of an effective weed management program in field crops. Current experiment was planned to evaluate the critical growth period ofSetaria and level of yield losses associated with delay in weeding in rain-fed drip irrigated wheat production system of Saudi Arabia. Field experiment was conducted to evaluate the effect of weeding interval (07-21, 14-28, 21-35, 28-42 and 35-49 days after sowing) and drought stress (75% and 50% of field capacity) on Setaria growth, wheat yield and water use efficiency. Season long weedy check and wellwatered (100% FC) plots were also maintained for comparison. Weeding interval and drought stress significantly (p ≤ 0.05) affected the growth and yield of Setaria and wheat. Drought stress from 75% to 50% FC resulted in reductions of 29-40% in Setaria height, 14-27% in Setaria density and 11-26% in Setaria dry biomass. All weeding intervals except 35-49 DAS significantly suppressedSetaria growth as compared with control. Delay in weeding increased weed-crop competition interval and reduced wheat yield and yield contributors. Therefore, the lowest yield of 1836 kg ha-1 was attained for weeding interval of 35-49 DAS at 50% FC. Water use efficiency and harvest index increased with decreasing FC levels but reduced with delay in weeding. Correlation analysis predicted negative association ofSetariadensity with wheat yield and yield contributors and the highest negative association was for harvest index (-0.913) and water use efficiency (-0.614). Early management of Setaria is imperative for successful wheat production otherwise yield losses are beyond economical limits.

scholarly journals Increased Resistance to Multiple Antimicrobials and Altered Resistance Gene Expression in CMY-2-Positive Salmonella enterica following a Simulated Patient Treatment with Ceftriaxone

2012 ◽  
Vol 78 (22) ◽  
pp. 8062-8066 ◽  
Author(s):  
Russell D. Hamilton ◽  
Holly J. Hulsebus ◽  
Samina Akbar ◽  
Jeffrey T. Gray
Keyword(s):  
Gene Expression ◽  
Antimicrobial Resistance ◽  
Resistance Gene ◽  
Resistance Genes ◽  
Salmonella Enterica ◽  
The United States ◽  
Simulated Patient ◽  
Patient Treatment ◽  
Content Type

ABSTRACTSalmonellosis is one of the most common causes of food-borne disease in the United States. Increasing antimicrobial resistance and corresponding increases in virulence present serious challenges. Currently, empirical therapy for invasiveSalmonella entericainfection includes either ceftriaxone or ciprofloxacin (E. L. Hohmann, Clin. Infect. Dis. 32:263–269, 2001). TheblaCMY-2gene confers resistance to ceftriaxone, the antimicrobial of choice for pediatric patients with invasiveSalmonella entericainfections, making these infections especially dangerous (J. M. Whichard et al., Emerg. Infect. Dis. 11:1464–1466, 2005). We hypothesized thatblaCMY-2-positiveSalmonella entericawould exhibit increased MICs to multiple antimicrobial agents and increased resistance gene expression following exposure to ceftriaxone using a protocol that simulated a patient treatmentin vitro. SevenSalmonella entericastrains survived a simulated patient treatmentin vitroand, following treatment, exhibited a significantly increased ceftriaxone MIC. Not only would these isolates be less responsive to further ceftriaxone treatment, but because theblaCMY-2genes are commonly located on large, multidrug-resistant plasmids, increased expression of theblaCMY-2gene may be associated with increased expression of other drug resistance genes located on the plasmid (N. D. Hanson and C. C. Sanders, Curr. Pharm. Des. 5:881–894, 1999). The results of this study demonstrate that a simulated patient treatment with ceftriaxone can alter the expression of antimicrobial resistance genes, includingblaCMY-2andfloRinS. entericaserovar Typhimurium andS. entericaserovar Newport. Additionally, we have shown increased MICs following a simulated patient treatment with ceftriaxone for tetracycline, amikacin, ceftriaxone, and cefepime, all of which have resistance genes commonly located on CMY-2 plasmids. The increases in resistance observed are significant and may have a negative impact on both public health and antimicrobial resistance ofSalmonella enterica.

scholarly journals Detection of Florfenicol Resistance Genes inEscherichia coli Isolated from Sick Chickens

2000 ◽  
Vol 44 (2) ◽  
pp. 421-424 ◽  
Author(s):  
Kathleen Keyes ◽  
Charlene Hudson ◽  
John J. Maurer ◽  
Stephan Thayer ◽  
David G. White ◽  
...  
Keyword(s):  
United States ◽  
Escherichia Coli ◽  
Resistance Gene ◽  
Resistance Genes ◽  
Molecular Typing ◽  
The United States ◽  
Clinical Isolates ◽  
Inescherichia Coli

ABSTRACT Florfenicol is an antibiotic approved for veterinary use in cattle in the United States in 1996. Although this drug is not used in poultry, we have detected resistance to florfenicol in clinical isolates of avian Escherichia coli. Molecular typing demonstrated that the florfenicol resistance gene, flo, was independently acquired and is plasmid encoded.

US Immigration Is Associated With Rapid and Persistent Acquisition of Antibiotic Resistance Genes in the Gut

2019 ◽  
Vol 71 (2) ◽  
pp. 419-421
Author(s):  
Quentin Le Bastard ◽  
Pajau Vangay ◽  
Eric Batard ◽  
Dan Knights ◽  
Emmanuel Montassier
Keyword(s):  
United States ◽  
Antibiotic Resistance ◽  
Resistance Gene ◽  
Resistance Genes ◽  
Gut Microbiome ◽  
Antibiotic Resistance Gene ◽  
Antibiotic Resistance Genes ◽  
The United States ◽  
Human Migration ◽  
Metagenomics Analysis

Abstract Little is known about the effect of human migration on gut microbiome antibiotic resistance gene (ARG) carriage. Using deep shotgun stool metagenomics analysis, we found a rapid increase in gut microbiome ARG richness and abundance in women from 2 independent ethnic groups relocating from Thailand to the United States.

scholarly journals Wheat and Barley Susceptibility and Tolerance to Multiple Isolates of Wheat streak mosaic virus

Plant Disease ◽  
2015 ◽  
Vol 99 (10) ◽  
pp. 1383-1389 ◽  
Author(s):  
Erik Lehnhoff ◽  
Zachariah Miller ◽  
Fabian Menalled ◽  
Dai Ito ◽  
Mary Burrows
Keyword(s):  
Winter Wheat ◽  
Mosaic Virus ◽  
Great Plains ◽  
Spring Wheat ◽  
Virus Disease ◽  
Wheat Yield ◽  
Wheat Streak Mosaic Virus ◽  
Yield Losses ◽  
Wheat Varieties ◽  
Cultivar Screening

One of the greatest virus disease threats to wheat production in the Great Plains of the USA is Wheat streak mosaic virus (WSMV). Breeding programs have developed wheat varieties that are resistant or tolerant to WSMV infection, but these characteristics are climate dependent, and may also vary by WSMV isolate. We tested 10 spring and nine winter wheat (Triticum aestivum) varieties and two barley (Hordeum vulgare) varieties for resistance and tolerance to one WSMV isolate over four years. In spring wheat and barley, there were year by cultivar interactions in terms of resistance and tolerance. However, in winter wheat, yield losses due to WSMV were relatively consistent across years and varieties. Additionally, we tested the impacts of three WSMV isolates individually and in a mixture on twelve, two, and twelve varieties of spring wheat, barley, and winter wheat, respectively. Resistance and tolerance varied by isolate and cultivar, but there were no isolate by cultivar interactions. For spring wheat and barley, yield impacts were greater for two of the three single isolates than for the isolate mixture, whereas in winter wheat, the isolate mixture caused greater yield losses than the individual isolates. Overall, the results indicate that resistance and tolerance phenotypes were influenced by environmental conditions and by WSMV isolate or combination of isolates, suggesting that cultivar screening should be conducted over multiple years and with multiple virus isolates.

scholarly journals Identification of the Wheat Curl Mite as the Vector of the High Plains Virus of Corn and Wheat

Plant Disease ◽  
1997 ◽  
Vol 81 (10) ◽  
pp. 1161-1166 ◽  
Author(s):  
Dallas L. Seifers ◽  
Tom L. Harvey ◽  
T. J. Martin ◽  
Stanley G. Jensen
Keyword(s):  
Gel Electrophoresis ◽  
Polyacrylamide Gel Electrophoresis ◽  
Sodium Dodecyl ◽  
Triticum Aestivum L ◽  
Enzyme Linked Immunosorbent Assay ◽  
High Plains ◽  
Serological Relationship ◽  
Hordeum Vulgare L ◽  
Wheat Curl Mite ◽  
Aceria Tosichella

Wheat with virus-like symptoms (extracts containing a 33-kDa protein in sodium dodecyl sulfate-polyacrylamide gel electrophoresis, negative in enzyme-linked immunosorbent assay to wheat streak mosaic virus, and not infectious in a backassay to other wheat) reacted positively to antiserum made against a protein purified from symptomatic corn infected with the High Plains virus (HPV), indicating a serological relationship between the corn and wheat pathogens. The wheat curl mite (WCM, Aceria tosichella Keifer) was identified as the vector of the virus and caused persistent infection of barley (Hordeum vulgare L.) and wheat (Triticum aestivum L.) in greenhouse experiments. The HPV was recovered in the field from naturally infected wheat where the number of HPV-infected plants decreased with increasing distance from the WCM source in volunteer wheat.

Molecular markers indicate that the wheat curl mite, Aceria tosichella Keifer, may represent a species complex in Australia

2009 ◽  
Vol 99 (5) ◽  
pp. 479-486 ◽  
Author(s):  
M. Carew ◽  
M. Schiffer ◽  
P. Umina ◽  
A. Weeks ◽  
A. Hoffmann
Keyword(s):  
Adenine Nucleotide ◽  
Cereal Crops ◽  
Rrna Gene ◽  
Alternate Host ◽  
Nuclear Markers ◽  
Wheat Varieties ◽  
Wheat Curl Mite ◽  
Aceria Tosichella ◽  
Putative Species ◽  
Mitochondrial 16S Rrna Gene

AbstractThe wheat curl mite (WCM), Aceria tosichella Keifer, is an eriophyoid pest of cereals, and the vector responsible for transmitting wheat streak mosaic virus. Several authors have suggested cryptic species of this mite identified through morphological variation, but this has never been conclusively demonstrated. Here, we use the mitochondrial 16S rRNA gene and two nuclear markers (internal transcribed spacer 1 and adenine nucleotide translocase) to show that WCM from Australia consists of at least two separate lineages that may represent putative species. In our study, both WCM variants were widespread and the only eriophyoids found on wheat varieties. The WCM variants were also found on alternate host plants, including some plants not known to host WCM. These results have implications for the control of this pest within Australian cereal crops.

scholarly journals Factors Responsible for Yield Gap of Wheat at Farmers’ Field in Two Districts of Bangladesh

2013 ◽  
Vol 23 (1-2) ◽  
pp. 91-99 ◽  
Author(s):  
MA Kashem ◽  
MAM Miah ◽  
MA Islam ◽  
PC Roy
Keyword(s):  
Wheat Yield ◽  
Yield Gap ◽  
Sowing Time ◽  
Wheat Varieties ◽  
Wheat Production ◽  
Wheat Field ◽  
Yield Gaps ◽  
Practice Gaps ◽  
Practice Gap ◽  
Late Sowing

The main purpose of the research was to identify factors responsible for yield gap in wheat production. Eighteen (18) experiments were conducted in two major wheat growing districts Rangpur and Dinajpur in two consecutive years. The selected varieties for the conducted research were Prodip, Satabdi and Sourav. All the experiments were established in farmers’ fields providing all recommendations for wheat production. It was observed that yield gap varied with the variety and farmers to farmers and location to location. The overall yield gap of Prodip was the highest (18.43 percent) followed by Sourav (18.15 percent) and Satabdi (17.45 percent). Yield gaps of all the wheat varieties under study were higher in Rangpur site than Dinajpur site. The practice gap was the highest in gypsum application (69 percent) followed by boron (67 percent), sowing time (40 percent). Practice gaps in the application of MoP, TSP and irrigation were almost equal, 40 percent, 37 percent, and 36 percent respectively. Late sowing, non use of dolomite and micro nutrients (zinc and boron) in wheat yield with sub-optimal doses of phosphatic and potash fertilizers were the main reasons for yield gap. Adoption of short duration T. aman variety and optimal doses of chemical fertilizers with micro nutrients in wheat field could minimize this gap to a greater extent. Preventive measures against bird attack after sowing of seeds for optimum plant population would have impact in narrow down this yield gap as well.DOI: http://dx.doi.org/10.3329/pa.v23i1-2.16620Progress. Agric. 23(1 & 2): 91 – 99, 2012

scholarly journals Occurrence and Distribution of Triticum mosaic virus in the Central Great Plains

Plant Disease ◽  
2013 ◽  
Vol 97 (1) ◽  
pp. 21-29 ◽  
Author(s):  
E. Byamukama ◽  
D. L. Seifers ◽  
G. L. Hein ◽  
E. De Wolf ◽  
N. A. Tisserat ◽  
...  
Keyword(s):  
United States ◽  
Winter Wheat ◽  
South Dakota ◽  
Mosaic Virus ◽  
Great Plains ◽  
The United States ◽  
High Plains ◽  
Double Infection ◽  
Field Surveys ◽  
Wheat Curl Mite

Wheat curl mite (WCM)-transmitted viruses—namely, Wheat streak mosaic virus (WSMV), Triticum mosaic virus (TriMV), and the High Plains virus (HPV)—are three of the wheat-infecting viruses in the central Great Plains of the United States. TriMV is newly discovered and its prevalence and incidence are largely unknown. Field surveys were carried out in Colorado, Kansas, Nebraska, and South Dakota in spring and fall 2010 and 2011 to determine TriMV prevalence and incidence and the frequency of TriMV co-infection with WSMV or HPV in winter wheat. WSMV was the most prevalent and was detected in 83% of 185 season–counties (= s-counties), 73% of 420 season–fields (= s-fields), and 35% of 12,973 samples. TriMV was detected in 32, 6, and 6% of s-counties, s-fields, and samples, respectively. HPV was detected in 34, 15, and 4% of s-counties, s-fields, and samples, respectively. TriMV was detected in all four states. In all, 91% of TriMV-positive samples were co-infected with WSMV, whereas WSMV and HPV were mainly detected as single infections. The results from this study indicate that TriMV occurs in winter wheat predominantly as a double infection with WSMV, which will complicate breeding for resistance to WCM-transmitted viruses.

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