Journal ArticleDOI
Occurrence of a New Russian Wheat Aphid Biotype in Colorado
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TLDR
This work confirmed observations in spring 2003 suggesting that a new biotype of RWA was present in southeastern Colorado, and induced greater injury than the original biotype in standard greenhouse seedling screening tests with a limited collection of resistant and susceptible cultivars.Abstract:
Russian wheat aphid [RWA, Diuraphis noxia (Mordvilko)] is a serious pest of wheat (Triticum aestivum L.) in the western USA Great Plains region. While variation in virulence among different RWA isolates has been reported elsewhere, no such variation has been documented among North American RWA isolates. Our objective was to confirm observations in spring 2003 suggesting that a new biotype of RWA was present in southeastern Colorado. The new biotype induced greater injury (leaf rolling and overall plant damage) than the original biotype in standard greenhouse seedling screening tests with a limited collection of resistant and susceptible cultivars. A second experiment with a broader collection of known RWA resistance sources identified only one accession, 94M370 (Dn7 gene), with resistance to the new biotype. Development of wheat cultivars with resistance to this new biotype will depend on rapid identification and deployment of new resistance sources.read more
Citations
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Journal ArticleDOI
Discovery of Soybean Aphid Biotypes
TL;DR: These tests confirm that there are at least two distinct biotypes of A. glycines in North America and will be useful sources of resistance to both isolates.
Journal ArticleDOI
A new soybean aphid (Hemiptera: Aphididae) biotype identified.
TL;DR: The identification of soybean aphid biotypes that can overcome Rag1 and Rag2 resistance, even before soybean cultivars with the resistance genes have been deployed in production, suggests that there is high variability in virulence within aphid populations present in North America.
Journal ArticleDOI
Plant immunity in plant-aphid interactions.
Maëlle Jaouannet,Patricia A. Rodriguez,Peter Thorpe,Camille J. G. Lenoir,Ruari MacLeod,Ruari MacLeod,Carmen Escudero-Martinez,Carmen Escudero-Martinez,Jorunn I. B. Bos,Jorunn I. B. Bos +9 more
TL;DR: It is hypothesize that aphids interact with non-host plants at the molecular level, but are potentially not successful in suppressing plant defenses and/or releasing nutrients.
Journal ArticleDOI
Proteomic analysis of secreted saliva from Russian wheat aphid (Diuraphis noxia Kurd.) biotypes that differ in virulence to wheat.
TL;DR: The findings reveal that the salivary proteome of RWA, a phytotoxic aphid, differs considerably from those reported for nonphytotoxic Aphid species, and the potential roles of proteins used in the general plant feeding processes of aphids and those that are potential phytOToxins related to aphid virulence are discussed.
Journal ArticleDOI
Plant resistance to aphid feeding: behavioral, physiological, genetic and molecular cues regulate aphid host selection and feeding
C. Michael Smith,Wen-Po Chuang +1 more
TL;DR: Virulence to aphid resistance genes of plants occurs in 17 aphid species--more than half of all arthropod biotypes demonstrating virulence, highlighting the need to identify new sources of resistance of diverse sequence and function in order to delay or prevent biotype development.
References
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Journal ArticleDOI
Microsatellite markers linked to six Russian wheat aphid resistance genes in wheat
TL;DR: Results confirm that Dn1, Dn2 and Dn5 are tightly linked to each other, and provide new information about their location, being 7DS, near the centromere, instead of as previously reported on 7DL.
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Plant Resistance Studies with Diuraphis noxia (Homoptera: Aphididae), a New United States Wheat Pest
TL;DR: It appears that current greenbug-resistant wheat and barley lines do not have sufficient D. noxia resistance to be useful in a plant resistance program.
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Inheritance of resistance in two Triticum aestivum lines to Russian wheat aphid (Homoptera: Aphididae).
TL;DR: Resistance reactions of backcross, F2 and F3 seedlings in greenhouse tests indicated that resistance in each line is controlled by a single dominant gene and that these genes are independently inherited.
Journal ArticleDOI
Biotypic Variation in a Worldwide Collection of Russian Wheat Aphid (Homoptera: Aphididae)
TL;DR: Overall, percentage leaf chlorosis was the best criterion for detecting biotypic variation in D. noxia on cereals; however, the differing mechanisms of resistance expressed by these cereals makes it important to consider other plant and insect factors.
Journal ArticleDOI
Intergeneric transfer (rye to wheat) of a gene(s) for Russian wheat aphid resistance
G. F. Marais,M. Horn,F. Du Torr +2 more
TL;DR: An octoploid triticale was derived from the F 1 of a Russian wheat aphid-resistant rye and recovered five euploid Russian-wheat-aphid- resistant plants.