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<p>Bacterial wilt, caused by the <i>Ralstonia solanacearum</i> species complex, remains a major constraint in eggplant production across multiple agro-ecological zones in India. The pathogen’s aggressive vascular colonization, broad environmental adaptability, and persistence in soil and alternative hosts drive recurrent crop failures, with yield losses reaching 60–100% under conducive conditions. Resistance breeding is the only scalable, environmentally aligned mitigation pathway. This study undertook multi-location screening of ICAR-IIVR eggplant varieties and hybrids under artificial inoculation in coastal Goa and sick plot hotspot conditions in Ranchi, India. Genotypes displayed substantial variability in wilt incidence, ranging from 5 to 95% at 28 DAI. Kashi Taru consistently exhibited extreme susceptibility, while varieties such as Selection-10, Kashi Manohar, Kashi Vijay, Kashi Green Round, and Kashi Shyama showed resistance. Cross-location performance highlighted strong environmental interaction, with Kashi Vijay shifting from resistant in Goa to susceptible in Ranchi. Genetic analysis revealed monogenic dominant resistance in the Kashi Vijay × Goa Brinjal-2 cross (3:1 segregation) and duplicate recessive gene action in the Goa Brinjal-5 × Kashi Himani cross (15:1). These outcomes emphasis the heterogeneous inheritance patterns driven by pathogen strain diversity and local epidemiology. The study identified Selection-10 as bacterial wilt resistant genotype, gene action in resistant Goa brinjal 2 and Goa brinjal 5 and underscores the need to characterize virulent regional strains of the pathogen and validate resistant materials across diverse wilt-prone environments to utilise in breeding programme.</p>

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Genotype-Specific Resistance Dynamics to Bacterial Wilt in Eggplant: Multi-Location Screening and Inheritance Analysis Using Virulent Ralstonia solanacearum Strains

  • 期刊论文

  • 发表日期：

    2026年3月25日

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  • S. Bhuvaneswari,
  • R. Ramesh,
  • P. Bhavana,
  • Shailesh K. Tiwari

摘要

Bacterial wilt, caused by the Ralstonia solanacearum species complex, remains a major constraint in eggplant production across multiple agro-ecological zones in India. The pathogen’s aggressive vascular colonization, broad environmental adaptability, and persistence in soil and alternative hosts drive recurrent crop failures, with yield losses reaching 60–100% under conducive conditions. Resistance breeding is the only scalable, environmentally aligned mitigation pathway. This study undertook multi-location screening of ICAR-IIVR eggplant varieties and hybrids under artificial inoculation in coastal Goa and sick plot hotspot conditions in Ranchi, India. Genotypes displayed substantial variability in wilt incidence, ranging from 5 to 95% at 28 DAI. Kashi Taru consistently exhibited extreme susceptibility, while varieties such as Selection-10, Kashi Manohar, Kashi Vijay, Kashi Green Round, and Kashi Shyama showed resistance. Cross-location performance highlighted strong environmental interaction, with Kashi Vijay shifting from resistant in Goa to susceptible in Ranchi. Genetic analysis revealed monogenic dominant resistance in the Kashi Vijay × Goa Brinjal-2 cross (3:1 segregation) and duplicate recessive gene action in the Goa Brinjal-5 × Kashi Himani cross (15:1). These outcomes emphasis the heterogeneous inheritance patterns driven by pathogen strain diversity and local epidemiology. The study identified Selection-10 as bacterial wilt resistant genotype, gene action in resistant Goa brinjal 2 and Goa brinjal 5 and underscores the need to characterize virulent regional strains of the pathogen and validate resistant materials across diverse wilt-prone environments to utilise in breeding programme.