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<p>The <i>aus</i> subgroup of rice, originating from eastern India and Bangladesh, has been recognized as a valuable genetic reservoir for tolerance to multiple stress conditions, including drought. However, an extensive analysis of natural variation for drought-responsive traits in <i>aus</i> rice is lacking, limiting the identification of superior donor lines for breeding drought-resilient varieties. To address this gap, we evaluated a panel of 170 <i>aus</i> accessions from the 3000 Rice Genome Project under field drought stress conditions for 13 morpho-physiological traits, including grain yield (Yld). Traits such as relative water content (RWC), plant height (Ht), canopy cover (CANO), and Yld showed significant variation (<i>P</i> &lt; 0.05) among the three tolerance groups defined by leaf desiccation severity, clearly separating in morpho-space through principal component analysis (PCA). Grain yield correlated positively with leaf drying, RWC, Ht, and CANO, although correlation strength varied among the tolerance groups. PCA further identified promising accessions with superior trait combinations, highlighting their potential as valuable donors for drought tolerance. Six genetic clusters of <i>aus</i> rice displayed significant differences (<i>P</i> &lt; 0.05) in key drought-related traits, indicating an adaptive advantage of accessions originating from rainfed, drought-prone regions. Our results emphasize the extensive drought tolerance variability in the aus rice subgroup, providing essential resources for breeding and genetic improvement programs.</p>

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Physiological and Genetic Insights into Drought Tolerance in Aus Rice: Variability, Trait Correlations, and Breeding Implications

  • 期刊论文

  • 发表日期：

    2025年7月30日

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  • Puranjoy Sar,
  • Motilal Behera,
  • Koushik Chakraborty,
  • Umakanta Ngangkham,
  • Bibhash Chandra Verma,
  • Amrita Banerjee,
  • Debarati Bhaduri,
  • Jitendra Kumar,
  • Nimai Prasad Mandal,
  • Paresh Chandra Kole,
  • Somnath Roy

摘要

The aus subgroup of rice, originating from eastern India and Bangladesh, has been recognized as a valuable genetic reservoir for tolerance to multiple stress conditions, including drought. However, an extensive analysis of natural variation for drought-responsive traits in aus rice is lacking, limiting the identification of superior donor lines for breeding drought-resilient varieties. To address this gap, we evaluated a panel of 170 aus accessions from the 3000 Rice Genome Project under field drought stress conditions for 13 morpho-physiological traits, including grain yield (Yld). Traits such as relative water content (RWC), plant height (Ht), canopy cover (CANO), and Yld showed significant variation (P < 0.05) among the three tolerance groups defined by leaf desiccation severity, clearly separating in morpho-space through principal component analysis (PCA). Grain yield correlated positively with leaf drying, RWC, Ht, and CANO, although correlation strength varied among the tolerance groups. PCA further identified promising accessions with superior trait combinations, highlighting their potential as valuable donors for drought tolerance. Six genetic clusters of aus rice displayed significant differences (P < 0.05) in key drought-related traits, indicating an adaptive advantage of accessions originating from rainfed, drought-prone regions. Our results emphasize the extensive drought tolerance variability in the aus rice subgroup, providing essential resources for breeding and genetic improvement programs.