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<p>Yam (<i>Dioscorea rotundata</i>) genotypes respond differently to multiple environments. Selecting the stable ones without compromising key traits is pivotal in breeding programmes. The present study evaluated a panel of 40 advanced yam genotypes (5 landraces and 35 improved&#xa0;varieties) from different sources for yield performance&#xa0;and stability as well as desirable&#xa0;food properties. Field trials were established following a randomized complete block design at four locations over three years in Benin. Data were collected on fresh tuber weight, dry matter and sensory attributes such as the quality of boiled and pounded yams. The overall mean yield per plant varied from 2.32 to 4.42&#xa0;kg with OP1832 and Katala having the lowest and highest mean productivity, respectively. Highly significant (<i>P</i> &lt; 0.001) variations among genotype (G), environment (E) and GxE were noted for yield. The additive main and multiplicative interaction (AMMI) stability value identified Kpouna as the most stable genotype while OP1811 exhibited the greatest instability. A genotype selection Index (GSI) which merged both stability and yield ranked Kpouna, OP20 and OP78 as the top three yam genotypes. Genotypes combining both high yield and good food quality attributes were identified through the multi-trait genotype ideotype distance index which enabled the selection of the top six genotypes as per experimental site. Depending on the location, superior yam genotypes to be considered for release to farmers are kpouna, Katala, TDr1430007, Taatimanin, TDr8902665, OP2055, OP1416, OP416, OP255, and Amoula. This study underscores the value of both landraces and newly improved white Guinea yam varieties in improving key traits in breeding programs to better meet the needs of farmers, processors, and consumers.</p>

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Yield stability and multi-trait selection for agronomic and food quality traits in white guinea yam (Dioscorea rotundata) across multiple locations in Benin Republic

  • 期刊论文

  • 发表日期：

    2026年5月8日

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  • Esperance D. Codjia,
  • Myriame Dansi,
  • Jeannette Gbemissola Fakorede,
  • Asrat Asfaw,
  • Paterne A. Agre,
  • Igor O. Yelome,
  • Yêyinou Laura Estelle Loko,
  • Abel Amegan,
  • Honorine Ogou,
  • Alexandre Dansi

摘要

Yam (Dioscorea rotundata) genotypes respond differently to multiple environments. Selecting the stable ones without compromising key traits is pivotal in breeding programmes. The present study evaluated a panel of 40 advanced yam genotypes (5 landraces and 35 improved varieties) from different sources for yield performance and stability as well as desirable food properties. Field trials were established following a randomized complete block design at four locations over three years in Benin. Data were collected on fresh tuber weight, dry matter and sensory attributes such as the quality of boiled and pounded yams. The overall mean yield per plant varied from 2.32 to 4.42 kg with OP1832 and Katala having the lowest and highest mean productivity, respectively. Highly significant (P < 0.001) variations among genotype (G), environment (E) and GxE were noted for yield. The additive main and multiplicative interaction (AMMI) stability value identified Kpouna as the most stable genotype while OP1811 exhibited the greatest instability. A genotype selection Index (GSI) which merged both stability and yield ranked Kpouna, OP20 and OP78 as the top three yam genotypes. Genotypes combining both high yield and good food quality attributes were identified through the multi-trait genotype ideotype distance index which enabled the selection of the top six genotypes as per experimental site. Depending on the location, superior yam genotypes to be considered for release to farmers are kpouna, Katala, TDr1430007, Taatimanin, TDr8902665, OP2055, OP1416, OP416, OP255, and Amoula. This study underscores the value of both landraces and newly improved white Guinea yam varieties in improving key traits in breeding programs to better meet the needs of farmers, processors, and consumers.