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<p>The present study mainly focusing on phenotyping a RIL population derived from the cross Pusa 44 (Salinity-sensitive) x Bura Rata (Salinity tolerance) to elucidate the genetic basis of salinity tolerance. The RIL population was evaluated with two replications along with parents Pusa44 and Bhura Rata in an alpha lattice design at the microplot of ICAR-CSSRI, Karnal for two years. The mean grain yield was range of 642 to 4536&#xa0;kg/ha, while spikelet fertility was ranged from 8.6% to 87.6% with means 48.10. %. The analysis of correlation uncovered a strong positive relationship between grain yield and spikelet fertility (<i>r</i> = 0.87**), whereas vigor score showed a significant negative correlation with both grain yield (<i>r</i> = − 0.89**) and spikelet fertility (<i>r</i> = − 0.80**). Principle component analysis indicated that that 78.88% of the total variability was explained by three components. The tolerant RILs namely, RIL 280, RIL302, RIL299, RIL246, RIL222 and RIL307 exhibited low vigor scores, high spikelet fertility (&gt; 78%), and high grain yield (&gt; 3000&#xa0;kg/ha). These, promising salt-tolerant RILs can be nominated to multi-location trials (MLT) trails for varietal release or can be directly used in further breeding programs. The resulting phenotyping data can also be utilized for QTL identification and for dissecting the genetic mechanisms underlying salinity tolerance.</p>

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Salinity Stress Tolerance at the Reproductive Stage in Rice: Evidence from Recombinant Inbred Lines of the Landrace Bura Rata

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Suman Rathor,
  • S. L. Krishnamurthy,
  • Shailendra Kumar Arya,
  • B. M. Lokeshkumar,
  • P. C. Sharma,
  • R. K. Ellur,
  • Ashish Nain,
  • Pradeep Sharma,
  • Ankit Rathore,
  • J. R. Meghashree

摘要

The present study mainly focusing on phenotyping a RIL population derived from the cross Pusa 44 (Salinity-sensitive) x Bura Rata (Salinity tolerance) to elucidate the genetic basis of salinity tolerance. The RIL population was evaluated with two replications along with parents Pusa44 and Bhura Rata in an alpha lattice design at the microplot of ICAR-CSSRI, Karnal for two years. The mean grain yield was range of 642 to 4536 kg/ha, while spikelet fertility was ranged from 8.6% to 87.6% with means 48.10. %. The analysis of correlation uncovered a strong positive relationship between grain yield and spikelet fertility (r = 0.87**), whereas vigor score showed a significant negative correlation with both grain yield (r = − 0.89**) and spikelet fertility (r = − 0.80**). Principle component analysis indicated that that 78.88% of the total variability was explained by three components. The tolerant RILs namely, RIL 280, RIL302, RIL299, RIL246, RIL222 and RIL307 exhibited low vigor scores, high spikelet fertility (> 78%), and high grain yield (> 3000 kg/ha). These, promising salt-tolerant RILs can be nominated to multi-location trials (MLT) trails for varietal release or can be directly used in further breeding programs. The resulting phenotyping data can also be utilized for QTL identification and for dissecting the genetic mechanisms underlying salinity tolerance.