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Review

Elusive Diagnostic Markers for Russian Wheat Aphid Resistance in Bread Wheat: Deliberating and Reviewing the Status Quo

1
Agricultural Research Council, Small Grain, Private Bag X29, Bethlehem 9700, South Africa
2
Department of Life and Consumer Sciences, University of South Africa, Pretoria 0002, South Africa
*
Author to whom correspondence should be addressed.
Current address: LongReach Plant Breeders Management Pty Ltd., 6 Maxwell Street, P.O. Box 545, York WA 6302, Australia.
Current address: Hair and Skin Research Laboratory, Groote Schuur Hospital, Observatory, Cape Town 7925, South Africa.
§
Current address: Forensic Science Laboratory, 12 Bjorseth Crescent, Amanzimtoti 4125, South Africa.
Int. J. Mol. Sci. 2020, 21(21), 8271; https://doi.org/10.3390/ijms21218271
Received: 4 August 2020 / Revised: 22 August 2020 / Accepted: 24 August 2020 / Published: 4 November 2020
(This article belongs to the Section Molecular Plant Sciences)
Russian wheat aphid, Diuraphis noxia (Kurdjumov), is a severe pest of wheat, Triticum aestivum L., throughout the world. Resistant cultivars are viewed as the most economical and environmentally viable control available. Studies to identify molecular markers to facilitate resistance breeding started in the 1990s, and still continue. This paper reviews and discusses the literature pertaining to the D. noxia R-genes on chromosome 7D, and markers reported to be associated with them. Individual plants with known phenotypes from a panel of South African wheat accessions are used as examples. Despite significant inputs from various research groups over many years, diagnostic markers for resistance to D. noxia remain elusive. Factors that may have impeded critical investigation, thus blurring the accumulation of a coherent body of information applicable to Dn resistance, are discussed. This review calls for a more fastidious approach to the interpretation of results, especially considering the growing evidence pointing to the complex regulation of aphid resistance response pathways in plants. Appropriate reflection on prior studies, together with emerging knowledge regarding the complexity and specificity of the D. noxia–wheat resistance interaction, should enable scientists to address the challenges of protecting wheat against this pest in future. View Full-Text
Keywords: Diuraphis noxia (Kurdjumov); host plant resistance; insect-resistance breeding; marker-assisted selection; Triticum aestivum L. Diuraphis noxia (Kurdjumov); host plant resistance; insect-resistance breeding; marker-assisted selection; Triticum aestivum L.
MDPI and ACS Style

Tolmay, V.L.; Sydenham, S.L.; Sikhakhane, T.N.; Nhlapho, B.N.; Tsilo, T.J. Elusive Diagnostic Markers for Russian Wheat Aphid Resistance in Bread Wheat: Deliberating and Reviewing the Status Quo. Int. J. Mol. Sci. 2020, 21, 8271. https://doi.org/10.3390/ijms21218271

AMA Style

Tolmay VL, Sydenham SL, Sikhakhane TN, Nhlapho BN, Tsilo TJ. Elusive Diagnostic Markers for Russian Wheat Aphid Resistance in Bread Wheat: Deliberating and Reviewing the Status Quo. International Journal of Molecular Sciences. 2020; 21(21):8271. https://doi.org/10.3390/ijms21218271

Chicago/Turabian Style

Tolmay, Vicki L., Scott L. Sydenham, Thandeka N. Sikhakhane, Bongiwe N. Nhlapho, and Toi J. Tsilo. 2020. "Elusive Diagnostic Markers for Russian Wheat Aphid Resistance in Bread Wheat: Deliberating and Reviewing the Status Quo" International Journal of Molecular Sciences 21, no. 21: 8271. https://doi.org/10.3390/ijms21218271

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