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<p>Wheat variety HD3437 is an improved version of the mega-wheat variety HD2967, with resistance to leaf and stripe rusts. It carries a seedling stripe rust resistance gene, <i>Yr10</i>, and a pleiotropic adult plant resistance gene, <i>Lr34</i>/<i>Yr18</i> conditioning adult plant resistance to both leaf and stripe rusts. Marker-assisted backcrossing was used to develop Near-isogenic lines (NILs) of HD2967 with <i>Lr34/Yr18</i> (91.21%) and <i>Yr10</i> (86.84%) in the BC<sub>2</sub>F<sub>1</sub> stage, and then these NILs were crossed to combine both genes. In the NILF<sub>2</sub> generation, homozygous two-gene positive plants were identified using markers linked to the target genes and selfed twice to produce NILF<sub>3</sub> and NILF<sub>4</sub> generations. A station trial was conducted at IARI, New Delhi, in 2020-21, consisting of 12 NILs with <i>Lr34/Yr18</i> + <i>Yr10</i> and RP (Recurrent Parent), and the check HD2967, which identified a superior-performing line. This superior-performing line also has the maximum genetic background of HD2967 (i.e., 99.52%) and is named HD3437 and tested in multilocation trials through AICRP (All India Coordinated Research Project) on Wheat during 2021-22. HD3437 exhibited high levels of resistance against leaf and stripe rusts both under natural and artificial epiphytotic conditions. For stripe rust, substantial reduction was observed in the case of HD3437 (Natural condition: ACI (Average Coefficient of Infection):2.00; artificial condition: 1.7) in comparison to recurrent parent and check HD2967 (Natural condition: ACI: 50.00; Artificial condition: 42.8). HD3437 yielded at par with RP HD2967 in the AICRP trials. Based on the weighted mean yield and the disease resistance, HD3437 was released for the North Capital Territory of Delhi during 2024. The presence of one seedling resistance gene for stripe rust and two APR genes for both leaf and stripe rusts will enhance the durability of this variety.</p>

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Combining seedling and adult plant resistance genes in HD2967 to develop a new variety, HD3437

  • 期刊论文

  • 发表日期：

    2026年7月5日

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  • Niharika Mallick,
  • Manish K. Choudhary,
  • Shivani,
  • Ajay K. Chandra,
  • Priyanka Agarwal,
  • Pooja Kumari,
  • Mona Singh,
  • K. Raghunandan,
  • M. G. Mallikarjuna,
  • M. Niranjana,
  • Shailendra K. Jha,
  • Vinod

摘要

Wheat variety HD3437 is an improved version of the mega-wheat variety HD2967, with resistance to leaf and stripe rusts. It carries a seedling stripe rust resistance gene, Yr10, and a pleiotropic adult plant resistance gene, Lr34/Yr18 conditioning adult plant resistance to both leaf and stripe rusts. Marker-assisted backcrossing was used to develop Near-isogenic lines (NILs) of HD2967 with Lr34/Yr18 (91.21%) and Yr10 (86.84%) in the BC2F1 stage, and then these NILs were crossed to combine both genes. In the NILF2 generation, homozygous two-gene positive plants were identified using markers linked to the target genes and selfed twice to produce NILF3 and NILF4 generations. A station trial was conducted at IARI, New Delhi, in 2020-21, consisting of 12 NILs with Lr34/Yr18 + Yr10 and RP (Recurrent Parent), and the check HD2967, which identified a superior-performing line. This superior-performing line also has the maximum genetic background of HD2967 (i.e., 99.52%) and is named HD3437 and tested in multilocation trials through AICRP (All India Coordinated Research Project) on Wheat during 2021-22. HD3437 exhibited high levels of resistance against leaf and stripe rusts both under natural and artificial epiphytotic conditions. For stripe rust, substantial reduction was observed in the case of HD3437 (Natural condition: ACI (Average Coefficient of Infection):2.00; artificial condition: 1.7) in comparison to recurrent parent and check HD2967 (Natural condition: ACI: 50.00; Artificial condition: 42.8). HD3437 yielded at par with RP HD2967 in the AICRP trials. Based on the weighted mean yield and the disease resistance, HD3437 was released for the North Capital Territory of Delhi during 2024. The presence of one seedling resistance gene for stripe rust and two APR genes for both leaf and stripe rusts will enhance the durability of this variety.