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<p>Rice improvement in rain-fed agroecosystems requires a reliable assessment of drought tolerance in locally adapted germplasm. The present investigation was designed to evaluate the genetic diversity in drought-tolerant <i>Ahu</i> rice (<i>Oryza sativa</i> L.) cultivars of Assam, India, with SSR (simple sequence repeat) genotyping. Fifty drought-tolerant lines were screened out among 325 germplasm lines collected. A genetic variation study using 40 SSR markers revealed distinct genetic variation among the rice landraces, with two drought-tolerant lines, Nagina22 (<i>N22</i>) and <i>APO</i>, serving as references. The allelic count per locus throughout the twelve chromosomes varied from 2 to 6. The allelic mean per locus was 3.30, with an average PIC (Polymorphic Information Content) of 0.6938. The UPGMA algorithm-based dendrogram segregated the genotypes into six distinct clusters with a high degree of genetic variation. Five rice cultivars (Dumai, Tarabali, Payjihari4, Baismuthi, and Gerem dhan1) with robust drought tolerance tendency were further characterized by means of elevated production of ROS scavenging enzymes, cellular osmolytes. The present study will help the breeders in parental screening for the upcoming breeding programs of drought-tolerance.</p>

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Genetic Diversity in Ahu Rices for Drought Tolerance Using Microsatellite Markers

  • 期刊论文

  • 发表日期：

    2026年3月12日

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  • Rupak Kumar Sarma,
  • W. James Singha,
  • Diganta Deka,
  • Hemen Deka,
  • Pranaba Nanda Bhattacharyya,
  • Akhil Ranjan Baruah

摘要

Rice improvement in rain-fed agroecosystems requires a reliable assessment of drought tolerance in locally adapted germplasm. The present investigation was designed to evaluate the genetic diversity in drought-tolerant Ahu rice (Oryza sativa L.) cultivars of Assam, India, with SSR (simple sequence repeat) genotyping. Fifty drought-tolerant lines were screened out among 325 germplasm lines collected. A genetic variation study using 40 SSR markers revealed distinct genetic variation among the rice landraces, with two drought-tolerant lines, Nagina22 (N22) and APO, serving as references. The allelic count per locus throughout the twelve chromosomes varied from 2 to 6. The allelic mean per locus was 3.30, with an average PIC (Polymorphic Information Content) of 0.6938. The UPGMA algorithm-based dendrogram segregated the genotypes into six distinct clusters with a high degree of genetic variation. Five rice cultivars (Dumai, Tarabali, Payjihari4, Baismuthi, and Gerem dhan1) with robust drought tolerance tendency were further characterized by means of elevated production of ROS scavenging enzymes, cellular osmolytes. The present study will help the breeders in parental screening for the upcoming breeding programs of drought-tolerance.