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<p>Brown planthopper (BPH) is a major pest of rice. Growing direct seeded rice (DSR) without constant standing water or intermittent draining reduces its population buildup. However, volunteer, wild and weedy rice create a major hurdle in adoption of DSR as conventional herbicides or manual weeding fail to control them. These invasive weeds from the same genus may attract BPH on the standing crops of resistant rice varieties besides supporting pest overwintering. Forty-eight accessions of 22 <i>Oryza</i> species along with trait-specific checks were screened for BPH-resistance and imazethapyr-tolerance. Only IRGC 88828 (<i>O. schweinfurthiana</i>) was BPH-resistant, and none were tolerant to imazethapyr indicating the scope of harnessing the complementary benefits through introgression of both the traits in a single genotype. Two epistatic BPH-resistance QTLs from a landrace Salkathi and novel <i>Aceto Hydroxy Acid Synthase</i> (<i>AHAS</i>) gene mutation conferring imazethapyr tolerance were separately introgressed in a popular rice variety Naveen. After blind multilocation trials, BPH resistant near isogenic lines (NILs) with <i>qBph4.3</i> + <i>qBph4.4</i> were notified for general cultivation in India. Introgression of <i>AHAS</i> gene through tightly linked marker RM6844 enabled efficient control of the weed complexes of rice through imazethapyr application. However, in comparison to Naveen, significant reduction of grain yield (5.28–15.84%) and head rice recovery (15.68–15.85%) were recorded in the NILs. While combining the two traits, recombinants between <i>AHAS</i> and RM6844 were identified, which circumvented the linkage drags. Cultivation of the dual improved NILs will enable integrated pest management besides reducing cultivation cost, grain admixtures, insecticide use and environmental footprint in rice cultivation.</p>

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Marker-assisted introgression of brown planthopper resistance and herbicide tolerance for integrated pest management in direct seeded rice

  • 期刊论文

  • 发表日期：

    2026年4月20日

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  • Pritiranjan Sahoo,
  • Motilal Behera,
  • Lambodar Behera,
  • Sushmita Munda,
  • Sutapa Sarkar,
  • Mayabini Jena,
  • Kutubuddin A. Molla,
  • Anilkumar Chandrappa,
  • Prakash Chandra Rath,
  • Debajyoti Roy,
  • Nitiprasad N. Jambhulkar,
  • Amaresh Kumar Nayak,
  • Guru-Pirasanna-Pandi Govindharaj,
  • Meera Kumari Kar,
  • Mridul Chakraborti

摘要

Brown planthopper (BPH) is a major pest of rice. Growing direct seeded rice (DSR) without constant standing water or intermittent draining reduces its population buildup. However, volunteer, wild and weedy rice create a major hurdle in adoption of DSR as conventional herbicides or manual weeding fail to control them. These invasive weeds from the same genus may attract BPH on the standing crops of resistant rice varieties besides supporting pest overwintering. Forty-eight accessions of 22 Oryza species along with trait-specific checks were screened for BPH-resistance and imazethapyr-tolerance. Only IRGC 88828 (O. schweinfurthiana) was BPH-resistant, and none were tolerant to imazethapyr indicating the scope of harnessing the complementary benefits through introgression of both the traits in a single genotype. Two epistatic BPH-resistance QTLs from a landrace Salkathi and novel Aceto Hydroxy Acid Synthase (AHAS) gene mutation conferring imazethapyr tolerance were separately introgressed in a popular rice variety Naveen. After blind multilocation trials, BPH resistant near isogenic lines (NILs) with qBph4.3 + qBph4.4 were notified for general cultivation in India. Introgression of AHAS gene through tightly linked marker RM6844 enabled efficient control of the weed complexes of rice through imazethapyr application. However, in comparison to Naveen, significant reduction of grain yield (5.28–15.84%) and head rice recovery (15.68–15.85%) were recorded in the NILs. While combining the two traits, recombinants between AHAS and RM6844 were identified, which circumvented the linkage drags. Cultivation of the dual improved NILs will enable integrated pest management besides reducing cultivation cost, grain admixtures, insecticide use and environmental footprint in rice cultivation.