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<p>Heterosis breeding in cotton is predominantly adopted owing to the predominance of non-additive gene action for most traits. However, a few researchers have reported the occurrence of additive gene action. Therefore, assessing the combining ability associated with parents and the heterosis of the corresponding hybrids across environments is crucial for determining the consistency of gene action, since there is a paucity of such information in cotton. The current study examines the general combining ability (GCA) of parents, specific combining ability (SCA), and heterosis of the hybrids across environments. Thirty hybrids developed by crossing six lines and five testers in Line&#xa0;×&#xa0;Tester (L&#xa0;×&#xa0;T) mating fashion were evaluated in a randomized block design across three environments. The analysis focused on seed cotton yield per plant, number of sympodia per plant, number of bolls per plant, seed index, and upper half mean length. The results indicated that non-additive gene action predominated in individual environments. However, additive gene action was detected in a few traits, on a pooled basis, possibly due to the influence of differential experimental environments on gene action. The significance of GCA&#xa0;×&#xa0;environment was limited, hence opting for the selection of parents on a pooled basis for the majority of traits could be possible. However, significant SCA&#xa0;×&#xa0;environment interaction and varied <i>sca</i> effects across environments suggested that the selection of trait and environment-specific combinations must be adopted. Overall, the line TVH002 and the tester CO14 were identified as good combiners while, the crosses exhibited differential performance for environments.</p>

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Impact of environments on combining ability and heterosis in cotton (Gossypium hirsutum L.)

  • 期刊论文

  • 发表日期：

    2025年2月11日

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  • Mundakochi Meera,
  • Alagesan Subramanian,
  • Nallathambi Premalatha,
  • Narayanan Manikanda Boopathi,
  • Dhashnamurthi Vijayalakshmi,
  • Krishnamoorthy Iyanar,
  • Ramalingam Thangapandian,
  • Santosh Ganapati Patil

摘要

Heterosis breeding in cotton is predominantly adopted owing to the predominance of non-additive gene action for most traits. However, a few researchers have reported the occurrence of additive gene action. Therefore, assessing the combining ability associated with parents and the heterosis of the corresponding hybrids across environments is crucial for determining the consistency of gene action, since there is a paucity of such information in cotton. The current study examines the general combining ability (GCA) of parents, specific combining ability (SCA), and heterosis of the hybrids across environments. Thirty hybrids developed by crossing six lines and five testers in Line × Tester (L × T) mating fashion were evaluated in a randomized block design across three environments. The analysis focused on seed cotton yield per plant, number of sympodia per plant, number of bolls per plant, seed index, and upper half mean length. The results indicated that non-additive gene action predominated in individual environments. However, additive gene action was detected in a few traits, on a pooled basis, possibly due to the influence of differential experimental environments on gene action. The significance of GCA × environment was limited, hence opting for the selection of parents on a pooled basis for the majority of traits could be possible. However, significant SCA × environment interaction and varied sca effects across environments suggested that the selection of trait and environment-specific combinations must be adopted. Overall, the line TVH002 and the tester CO14 were identified as good combiners while, the crosses exhibited differential performance for environments.