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<p>Northeastern India has a diverse genetic reservoir of rice that remains largely underutilized for improving crop resilience against biotic and abiotic stresses. One of the most devastating threats to rice production worldwide is rice blast disease, caused by the fungus <i>Magnaporthe oryzae</i>. Despite this, the resistance genes present in local rice landraces have not been thoroughly explored. This study investigates the distribution of major blast resistance genes in rice germplasm from Northeastern India. A total of 58 genotypes from the region were screened, alongside one susceptible genotype (HR-12) and one resistant check (Tetep), in a uniform blast nursery to assess their responses to the disease. Fourteen gene-specific markers were employed to identify the presence of blast resistance genes. The results revealed that the blast resistance gene <i>Pik</i>-<i>p</i> was the most widely distributed, followed by <i>Piz</i> (96.66%), <i>Pi40</i>(t) (93.33%), and <i>Pi-ta</i> (90.00%). Other genes, such as <i>Piz-t</i> (86.66%), <i>Pi40</i> (83.33%), and <i>Pik</i> (73.33%), were also present in significant frequencies. Notably, two genotypes, Itanagar and Tomila, exhibited the presence of 11 blast resistance genes, making them excellent candidates for future breeding programs. Additionally, genotypes such as Chakhao Poreiton, Chakhao Chandel-2, Liangneng Chakhao, Barbite rice, Hungyo, Chamiyak, and Lamyanba contained 10 resistance genes, further underscoring their potential as donors in breeding initiatives.</p>

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Molecular Screening for Identification of Blast Resistance Genes in Northeastern Indian Rice Germplasm (Oryza sativa L.)

  • 期刊论文

  • 发表日期：

    2026年7月3日

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  • Thokchom Nepolian Singh,
  • Daizi Durba Saharia,
  • Dishari Biswas,
  • O. Priyadarshini Devi,
  • Artibashisha Hijam Pyngrope,
  • N. Brajendra Singh,
  • Pramesh Kh.,
  • P. Manjunath,
  • Th. Renuka Devi,
  • Sumitra Phurailatpam,
  • Umakanta Ngangkham,
  • Elangbam Lamalakshmi Devi,
  • Sunil Kumar Chongtham

摘要

Northeastern India has a diverse genetic reservoir of rice that remains largely underutilized for improving crop resilience against biotic and abiotic stresses. One of the most devastating threats to rice production worldwide is rice blast disease, caused by the fungus Magnaporthe oryzae. Despite this, the resistance genes present in local rice landraces have not been thoroughly explored. This study investigates the distribution of major blast resistance genes in rice germplasm from Northeastern India. A total of 58 genotypes from the region were screened, alongside one susceptible genotype (HR-12) and one resistant check (Tetep), in a uniform blast nursery to assess their responses to the disease. Fourteen gene-specific markers were employed to identify the presence of blast resistance genes. The results revealed that the blast resistance gene Pik-p was the most widely distributed, followed by Piz (96.66%), Pi40(t) (93.33%), and Pi-ta (90.00%). Other genes, such as Piz-t (86.66%), Pi40 (83.33%), and Pik (73.33%), were also present in significant frequencies. Notably, two genotypes, Itanagar and Tomila, exhibited the presence of 11 blast resistance genes, making them excellent candidates for future breeding programs. Additionally, genotypes such as Chakhao Poreiton, Chakhao Chandel-2, Liangneng Chakhao, Barbite rice, Hungyo, Chamiyak, and Lamyanba contained 10 resistance genes, further underscoring their potential as donors in breeding initiatives.