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<p>Rice <i>(Oryza sativa</i> L.<i>)</i> is an essential staple diet but due to increasing world’s population required production is getting less as narrow genetic base in the existing rice cultivars. Wild rice is the reservoir of many important genes such as yield stability, biotic and abiotic stress tolerance whereas Yamuna is a high yielding variety but lacks the genetic diversity required for rice hybridization program. Therefore, this study was conducted to conserve the valuable genes of the wild rice through hybridization. The F<sub>1:2</sub> hybrids, in comparison with their parents, exhibited wild traits like open panicle, purple stigma, spikelet awning, seed shattering, and red pericarp. The hybrids showed intermediate traits like plant height, flag leaf breadth, grain per panicle, percentage of filled grains, pollen viability, 1000 grains weight, and tiller number. Scanning electron microscopy showed distinctive ultrastructure with respect to the pericarp, testa, aleurone layer, protein bodies, and starchy endosperm in the parents and hybrids. The F<sub>2:3</sub> populations showed high Phenotypic and Genotypic coefficient of variance for traits like plant height, tiller number, grain per panicle. High heritability coupled with high genetic advance as percent of mean was observed for plant height, flag leaf length, panicle length, 1000 grains weight and yield per plant. The frequency distribution of the traits showed both positive and negative skewness. Results indicated that yield per plant showed significant positive correlation with 1000 grains weight, grain per panicle and tiller number. Cluster analyses divided the F<sub>2:3</sub> populations into eight clusters. In PCA first 5 components contributed 72.29% of the total variation. Future rice breeding programs may benefit from the knowledge obtained from this study in terms of yield advancement and selection.</p>

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Study of Genetic Variation Related to Yield Attributing Traits in F2:3 Rice Segregating Populations Developed Through Interspecific Hybridization

  • 期刊论文

  • 发表日期：

    2025年7月19日

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  • Shukdeb Sarkar,
  • Jayita Sarkar,
  • Pankaj Shil,
  • Bhumika T. Yonzon,
  • Sona Limboo,
  • Subhas Chandra Roy

摘要

Rice (Oryza sativa L.) is an essential staple diet but due to increasing world’s population required production is getting less as narrow genetic base in the existing rice cultivars. Wild rice is the reservoir of many important genes such as yield stability, biotic and abiotic stress tolerance whereas Yamuna is a high yielding variety but lacks the genetic diversity required for rice hybridization program. Therefore, this study was conducted to conserve the valuable genes of the wild rice through hybridization. The F1:2 hybrids, in comparison with their parents, exhibited wild traits like open panicle, purple stigma, spikelet awning, seed shattering, and red pericarp. The hybrids showed intermediate traits like plant height, flag leaf breadth, grain per panicle, percentage of filled grains, pollen viability, 1000 grains weight, and tiller number. Scanning electron microscopy showed distinctive ultrastructure with respect to the pericarp, testa, aleurone layer, protein bodies, and starchy endosperm in the parents and hybrids. The F2:3 populations showed high Phenotypic and Genotypic coefficient of variance for traits like plant height, tiller number, grain per panicle. High heritability coupled with high genetic advance as percent of mean was observed for plant height, flag leaf length, panicle length, 1000 grains weight and yield per plant. The frequency distribution of the traits showed both positive and negative skewness. Results indicated that yield per plant showed significant positive correlation with 1000 grains weight, grain per panicle and tiller number. Cluster analyses divided the F2:3 populations into eight clusters. In PCA first 5 components contributed 72.29% of the total variation. Future rice breeding programs may benefit from the knowledge obtained from this study in terms of yield advancement and selection.