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<p>Identification of novel genetic material for augmenting genetic gain in yield component traits requires characterisation of genetically broad-based germplasm. A panel of inbred lines (185) derived from a different pool of germplasm was evaluated at four different agro-climatic conditions for morpho-phenological and kernel and cob-related traits. The inbred lines were characterised for 19 DUS traits and subjected to principal component analysis. It was observed that leaf angle, leaf attitude, tassel angle, tassel density, tassel attitude, leaf sheath colour, and kernel row number were key contributors to the observed phenotypic diversity. The analysis of variance for kernel and cob-related traits indicated that inbred lines under investigation differ significantly from each other across the tested environments. Moderate to high genotypic coefficient of variation recorded by ear girth and kernel row number suggested that a simple selection can enhance trait mean, as these traits are under the control of additive genes. Therefore, Multi-Trait Genotype-Ideotype Distance Index (MGIDI) and Multi-Trait Stability Index (MTSI) based selection was carried to select the better performing lines across tested environments. A total of 28 inbred lines were shortlisted based on the MGIDI score. Among them, four inbred lines, viz., PML 24, AI 537, C 2809-1-2 and AI 577, were selected as desirable ideotypes based on MTSI value, and those can be used as genetic resources for future breeding programs.</p>

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Multi-Trait Genotype-Ideotype Distance Index (MGIDI) and Multi-Trait Stability Index (MTSI) Based Selection of Inbred Lines from a Field Corn (Zea mays L.) Panel for Yield Component Traits

  • 期刊论文

  • 发表日期：

    2026年2月24日

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  • Kumari Shilpa,
  • Ganapati Mukri,
  • Shashi Bhushan Tripathi,
  • Chandu Singh,
  • Jayant S. Bhat,
  • Raveendra N. Gadag,
  • K. V. Gowtham,
  • Chandra Prabha Singh

摘要

Identification of novel genetic material for augmenting genetic gain in yield component traits requires characterisation of genetically broad-based germplasm. A panel of inbred lines (185) derived from a different pool of germplasm was evaluated at four different agro-climatic conditions for morpho-phenological and kernel and cob-related traits. The inbred lines were characterised for 19 DUS traits and subjected to principal component analysis. It was observed that leaf angle, leaf attitude, tassel angle, tassel density, tassel attitude, leaf sheath colour, and kernel row number were key contributors to the observed phenotypic diversity. The analysis of variance for kernel and cob-related traits indicated that inbred lines under investigation differ significantly from each other across the tested environments. Moderate to high genotypic coefficient of variation recorded by ear girth and kernel row number suggested that a simple selection can enhance trait mean, as these traits are under the control of additive genes. Therefore, Multi-Trait Genotype-Ideotype Distance Index (MGIDI) and Multi-Trait Stability Index (MTSI) based selection was carried to select the better performing lines across tested environments. A total of 28 inbred lines were shortlisted based on the MGIDI score. Among them, four inbred lines, viz., PML 24, AI 537, C 2809-1-2 and AI 577, were selected as desirable ideotypes based on MTSI value, and those can be used as genetic resources for future breeding programs.