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<p>Eggplant (<i>Solanum melongena</i> L.) is a globally significant solanaceous vegetable, but its productivity is severely constrained by root-knot nematodes (RKN), particularly <i>Meloidogyne incognita</i>, which causes substantial yield losses. This study aimed to identify molecular markers linked to heat-stable RKN resistance to accelerate breeding efforts in eggplant. A mapping population derived from a resistant parent (IIHR-824) and a susceptible parent (VI046101) was developed, comprising F<sub>1</sub> and F<sub>2</sub> generations. Phenotyping under controlled high-temperature conditions (31–34&#xa0;°C) confirmed monogenic, dominant inheritance of RKN resistance, with a 3:1 segregation ratio observed in the F<sub>2</sub> population. Genotyping was performed using 400 SSR markers, of which 38 were polymorphic. Bulked segregant analysis identified the SSR marker ‘emf11A04’ as closely linked to the RKN resistance loci, showing perfect co-segregation with phenotypic resistance. The marker demonstrated a high segregation efficiency of 92.87%, with a phenotypic variation explained (PVE) of 46.34% and a LOD score of 15.94. This is the first report of a molecular marker linked to RKN resistance in eggplant to the best of our knowledge. The identified marker ‘emf11A04’ can facilitate marker-assisted selection (MAS) for developing durable, heat-stable RKN-resistant cultivars, providing a sustainable and environmentally friendly solution for managing RKN in eggplant breeding programs.</p>

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Identification of a molecular marker linked to heat-stable root-knot nematode (Meloidogyne incognita) resistance in eggplant (Solanum melongena)

  • 期刊论文

  • 发表日期：

    2025年9月8日

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  • Narayana Swamy Gujjala,
  • R. Uma Maheswari,
  • Ponnam Naresh,
  • Satyaprakash Barik,
  • G. C. Acharya,
  • K. Madhavi Reddy,
  • D. C. Lakshmana Reddy,
  • T. H. Singh

摘要

Eggplant (Solanum melongena L.) is a globally significant solanaceous vegetable, but its productivity is severely constrained by root-knot nematodes (RKN), particularly Meloidogyne incognita, which causes substantial yield losses. This study aimed to identify molecular markers linked to heat-stable RKN resistance to accelerate breeding efforts in eggplant. A mapping population derived from a resistant parent (IIHR-824) and a susceptible parent (VI046101) was developed, comprising F1 and F2 generations. Phenotyping under controlled high-temperature conditions (31–34 °C) confirmed monogenic, dominant inheritance of RKN resistance, with a 3:1 segregation ratio observed in the F2 population. Genotyping was performed using 400 SSR markers, of which 38 were polymorphic. Bulked segregant analysis identified the SSR marker ‘emf11A04’ as closely linked to the RKN resistance loci, showing perfect co-segregation with phenotypic resistance. The marker demonstrated a high segregation efficiency of 92.87%, with a phenotypic variation explained (PVE) of 46.34% and a LOD score of 15.94. This is the first report of a molecular marker linked to RKN resistance in eggplant to the best of our knowledge. The identified marker ‘emf11A04’ can facilitate marker-assisted selection (MAS) for developing durable, heat-stable RKN-resistant cultivars, providing a sustainable and environmentally friendly solution for managing RKN in eggplant breeding programs.