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<p>Yield stability is a key breeding objective in rainfed rice due to frequent drought, nutrient limitation and high environmental variability. The <i>aus</i> rice gene pool contains adaptive diversity, but its contribution to yield stability across contrasting production systems remains poorly quantified. The present study was conducted to evaluate 47 <i>aus</i> genotypes across four environments representing rainfed direct-seeded (E1), low-phosphorus (E2), transplanted (E3) and aerobic (E4) conditions at Hazaribag, India during 2022–2024. Grain yield was analysed using additive main effects and multiplicative interaction (AMMI), Eberhart–Russell regression and multivariate stability approaches. Environment and genotype × environment interaction explained 36.0% and 34.1% of total yield variation, respectively, while genotype main effects accounted for 18.8%. Genotypes differed widely in mean yield (197–484&#xa0;g m<sup>− 2</sup>) and stability parameters. Across analytical frameworks, a common set of genotypes, including ‘Kalia’, ‘ARC 11959’, ‘ARC 12021’, ‘ARC 12079’, ‘Devarasi’, and ‘Sada aus’, combined above-average yield with reduced environmental sensitivity. These genotypes also showed favourable performance under drought and phosphorus-deficient conditions, supporting their classification as broadly adapted. The convergence of parametric, variance-based, and multivariate models highlights the utility of <i>aus</i> germplasm for improving yield stability in rainfed rice and provides a basis for dissecting the genetic architecture underlying multi-stress adaptation.</p>

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Yield Stability of aus Rice Genotypes Across Contrasting Rainfed Agro-Ecologies: Identifying Potential Donors for Rainfed Rice Improvement

  • 期刊论文

  • 发表日期：

    2026年4月21日

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  • Puranjoy Sar,
  • Umakanta Ngangkham,
  • Koushik Chakraborty,
  • B. C. Verma,
  • Priyamedha,
  • Amrita Banerjee,
  • N. P. Mandal,
  • Somnath Roy

摘要

Yield stability is a key breeding objective in rainfed rice due to frequent drought, nutrient limitation and high environmental variability. The aus rice gene pool contains adaptive diversity, but its contribution to yield stability across contrasting production systems remains poorly quantified. The present study was conducted to evaluate 47 aus genotypes across four environments representing rainfed direct-seeded (E1), low-phosphorus (E2), transplanted (E3) and aerobic (E4) conditions at Hazaribag, India during 2022–2024. Grain yield was analysed using additive main effects and multiplicative interaction (AMMI), Eberhart–Russell regression and multivariate stability approaches. Environment and genotype × environment interaction explained 36.0% and 34.1% of total yield variation, respectively, while genotype main effects accounted for 18.8%. Genotypes differed widely in mean yield (197–484 g m− 2) and stability parameters. Across analytical frameworks, a common set of genotypes, including ‘Kalia’, ‘ARC 11959’, ‘ARC 12021’, ‘ARC 12079’, ‘Devarasi’, and ‘Sada aus’, combined above-average yield with reduced environmental sensitivity. These genotypes also showed favourable performance under drought and phosphorus-deficient conditions, supporting their classification as broadly adapted. The convergence of parametric, variance-based, and multivariate models highlights the utility of aus germplasm for improving yield stability in rainfed rice and provides a basis for dissecting the genetic architecture underlying multi-stress adaptation.