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Background <p>The widespread cultivation of water-saving and drought-resistance rice (WDR) represents a crucial strategy for sustainable agriculture in water-limited environments. Hanyou73, an elite WDR hybrid derived from the restorer line Hanhui3, exhibits outstanding drought resistance and stable yield performance. However, its susceptibility to blast, bacterial blight (BB), and brown planthopper (BPH) constrains its long-term cultivation stability.</p> Results <p>Three major resistance genes <i>Pi9</i> (blast), <i>Xa23</i> (BB) and <i>Bph6</i> (BPH) were successfully pyramided into Hanhui3 via marker-assisted backcross breeding. The resulting improved line, Hanhui303, retained 96.68% of the recurrent parent genome (RPG). Furthermore, Hanhui303 and Hanhui3 were indistinguishable using 48 standard SSR markers for variety identification. Hanhui303 and its hybrid rice conferred resistance to both blast, BB and BPH. The major important agronomic traits and grain quality of Hanhui303 and its hybrid rice obtained in field trials were similar to those of Hanhui3 and the control hybrid rice.</p> Conclusions <p>We developed a novel restorer line, Hanhui303, with significantly enhanced resistance to three major biotic stresses while maintaining the elite agronomic and drought resistance traits of Hanhui3. Due to its high genetic similarity and identical fingerprint profile, Hanhui303 can directly replace Hanhui3 in hybrid seed production. This study provides a practical and efficient strategy for improving multiple resistances in elite parental lines, thereby promoting the sustainable cultivation of WDR hybrids.</p>

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Improving the blast, bacterial blight, and brown planthopper resistance for a restorer line of WDR Hanhui3 by marker-assisted gene pyramiding

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月28日

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  • Jijin Chen,
  • Juhao Ruan,
  • Zhening Miao,
  • Deyan Kong,
  • Anning Zhang,
  • Feiming Wang,
  • Xinqiao Yu,
  • Lijun Luo,
  • Guolan Liu,
  • Yi Liu

摘要

Background

The widespread cultivation of water-saving and drought-resistance rice (WDR) represents a crucial strategy for sustainable agriculture in water-limited environments. Hanyou73, an elite WDR hybrid derived from the restorer line Hanhui3, exhibits outstanding drought resistance and stable yield performance. However, its susceptibility to blast, bacterial blight (BB), and brown planthopper (BPH) constrains its long-term cultivation stability.

Results

Three major resistance genes Pi9 (blast), Xa23 (BB) and Bph6 (BPH) were successfully pyramided into Hanhui3 via marker-assisted backcross breeding. The resulting improved line, Hanhui303, retained 96.68% of the recurrent parent genome (RPG). Furthermore, Hanhui303 and Hanhui3 were indistinguishable using 48 standard SSR markers for variety identification. Hanhui303 and its hybrid rice conferred resistance to both blast, BB and BPH. The major important agronomic traits and grain quality of Hanhui303 and its hybrid rice obtained in field trials were similar to those of Hanhui3 and the control hybrid rice.

Conclusions

We developed a novel restorer line, Hanhui303, with significantly enhanced resistance to three major biotic stresses while maintaining the elite agronomic and drought resistance traits of Hanhui3. Due to its high genetic similarity and identical fingerprint profile, Hanhui303 can directly replace Hanhui3 in hybrid seed production. This study provides a practical and efficient strategy for improving multiple resistances in elite parental lines, thereby promoting the sustainable cultivation of WDR hybrids.