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Genetic research

Identifying Resistance to Stripe Rust in Chinese Spring Wheat Landraces

Strategic Insights

— 1 min read

Researchers at Qinghai University have made a crucial discovery in the field of biochemistry and biophysics, shedding light on the complex issue of stripe rust resistance in Chinese spring wheat landraces. By analyzing 267 landraces from eight provinces, the study found that 7.5% of the accessions exhibited resistance to CYR32, while 12.4% showed resistance to CYR34, a dominant race of the disease. The research also highlighted the importance of adult-plant resistance (APR), with 2.25% of the landraces showing stable resistance, including the complete immunity of Banjiemang. Molecular analysis revealed the prevalence of Yr genes, including Yr10, Yr18, and Yr26, and multi-gene combinations in 60 accessions. The study concludes that the Yr18/Yr26 combination is a promising source of APR and provides valuable insights for pyramiding strategies to enhance stripe rust resistance.

Key Takeaways:

  • The research involved the evaluation of 267 landraces from eight provinces in China for seedling resistance against dominant races CYR32 and CYR34, as well as adult-plant resistance across five Qinghai natural disease nurseries.
  • At the seedling stage, 7.5% (20 accessions) and 12.4% (33 accessions) exhibited resistance to CYR32 and CYR34, respectively, with 2.99% (8 accessions) conferring dual resistance.
  • APR trials identified 2.25% (6 landraces) showing stable resistance, including Banjiemang with complete immunity (IT 0).
  • Molecular analyses revealed prevalent Yr genes, including Yr10 (38.6%, 103/267), Yr18 (29.6%, 79/267), Yr26 (20.9%, 56/267) and multi-gene combinations in 60 accessions.
  • The Yr18/Yr26 combination emerged as a promising APR source, suggesting its potential for pyramiding strategies to enhance stripe rust resistance.

Statistics:

  • 267 landraces were evaluated for seedling resistance against dominant races CYR32 and CYR34, as well as adult-plant resistance.
  • 20 accessions (7.5%) exhibited resistance to CYR32.
  • 33 accessions (12.4%) showed resistance to CYR34.
  • 2.99% (8 accessions) of the landraces conferred dual resistance.
  • 6 landraces (2.25%) showed stable resistance, including Banjiemang with complete immunity (IT 0).
  • 103 accessions (38.6%) carried the Yr10 gene.
  • 79 accessions (29.6%) carried the Yr18 gene.
  • 56 accessions (20.9%) carried the Yr26 gene.
  • 60 accessions (22.5%) had multi-gene combinations.
  • 97 accessions (36.3%) lacked known Yr genes.

Sources:

  • Huang, M., et al. "Identification of resistance to stripe rust in 267 Chinese spring wheat landraces germplasm and molecular detection of disease resistance genes." Biochemistry and Biophysics Reports (2025): 102206.
  • Qinghai University.

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