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Inheritance of Russian wheat aphid resistance in two Iranian bread wheat cultiar ‘Falat’ and ‘Azadi’
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Tohid Salehi *   , Tohid Najafi Mirak , Mohammad Reza Bihamta , Islam Majidi Heravan |
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Abstract: (552 Views) |
Introduction: The Russian wheat aphid (RWA), Diuraphis noxia (Mordvilko), is a major pest of cereal crops in many countries of the world, causing serious reduction in grain yield in wheat (Triticum aestivum L.) and barley (Hordeum vulgare L.). Incorporating genetic resistance to D. noxia into wheat cultivars is paramount to effectively reduce damage inflicted by this pest. The availability of more resistance genes to RWA may provide additional protection from new virulent strains or biotypes of the insect. Genetic resistance to D. noxia has been identified in wheat, barley and rye germplasm and several resistance genes are available for use in cultivar improvement.
Materials & Methods: In order to determine the inheritance of RWA resistance, two resistant Iranian bread wheat cultivar ‘Falat’ and ‘Azadi’ have crossed with the susceptible cultivar ‘Pishtaz’. For each cross, the F1, F2, F3 (in the case of Azadi×Pishtaz cross) and backcross (BCR and BCS) generations were produced. These generations therewith resistant and susceptible parents were cultured in the green-house conditions and were infected with RWA. Twenty-one days after infection, damages caused by aphid feeding were measured based on the leaf curling and leaf chlorosis of resistant and susceptible types following insect challenge. The resistance inheritance was considered by using Mendelian ratios in the F2, F3 and backcross generations.
Results: The obtained results were determined that both of studied traits, the leaf curling and leaf chlorosis, in ‘Azadi’ and ‘Falat’ cultivars are controlled by one dominant major gene and recessive major gene, respectively.
Conclusion: Since the both components of resistance are controlled with a major gene, using of hybridization and selection along different generations may be constructive in transfer of resistance to the intended cultivars. |
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| Keywords: Inheritance, Leaf chlorosis, Leaf curling, Resistance, Russian wheat aphid, Wheat |
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Full-Text [PDF 694 kb]
(193 Downloads)
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Type of Study: Research |
Subject:
Special
Received: 2026/02/16 | Accepted: 2026/01/30 | Published: 2026/06/5
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