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<p>Lentil is a highly nutritious legume essential for global food security and rising global demand. Lentil cultivation is severely impeded by the blight complex inflicted by <i>Stemphylium botryosum</i> and <i>Alternaria alternata</i>. This intricate disease is mostly prevalent in humid subtropical regions and is often exacerbated by climate change. Co-infections complicate pathogen identification and hinder effective management strategies. Existing research has primarily focused on resistance to individual pathogens, highlighting a research gap in addressing combined resistance to both pathogens. Therefore, the present study was conducted to elucidate the impact of genotype-environment interactions on disease dynamics across diverse locations over multiple years and to identify durable resistant genotypes for sustainable lentil production in blight-affected areas. Preliminary screening was conducted on 268 lentil genotypes. Subsequently, a panel of 25 promising genotypes, including susceptible checks, were further evaluated over three consecutive years at three locations in the Gangetic Alluvial and Red lateritic zones. Substantial variation was observed, with a significant impact of environment and genotype-environment interaction on the variable genotypic response, thus validating the preponderance of non-cross-over interaction and the urgency to detect durable resistance sources. The complementary use of BLUP-based predictions and GGE biplot visualisation precisely identified IC559983 as the most stable genotype with a moderately resistant response, and TCADL 19–5 as a desirable genotype with a consistent resistant response across the tested locations. The genotypes identified in this study offer valuable resources for effective management of the blight complex, with the potential to enhance lentil productivity and contribute to food security.</p>

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Deciphering genotype × environment interactions to assess durable resistance against the blight complex in lentil

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Huma Nazneen,
  • Raju Das,
  • Arpita Das,
  • Sudip Bhattacharya,
  • Soumyayan Roy,
  • Subrata Dutta,
  • Kuldeep Tripathi,
  • Sanjeev Gupta,
  • Shiv Kumar

摘要

Lentil is a highly nutritious legume essential for global food security and rising global demand. Lentil cultivation is severely impeded by the blight complex inflicted by Stemphylium botryosum and Alternaria alternata. This intricate disease is mostly prevalent in humid subtropical regions and is often exacerbated by climate change. Co-infections complicate pathogen identification and hinder effective management strategies. Existing research has primarily focused on resistance to individual pathogens, highlighting a research gap in addressing combined resistance to both pathogens. Therefore, the present study was conducted to elucidate the impact of genotype-environment interactions on disease dynamics across diverse locations over multiple years and to identify durable resistant genotypes for sustainable lentil production in blight-affected areas. Preliminary screening was conducted on 268 lentil genotypes. Subsequently, a panel of 25 promising genotypes, including susceptible checks, were further evaluated over three consecutive years at three locations in the Gangetic Alluvial and Red lateritic zones. Substantial variation was observed, with a significant impact of environment and genotype-environment interaction on the variable genotypic response, thus validating the preponderance of non-cross-over interaction and the urgency to detect durable resistance sources. The complementary use of BLUP-based predictions and GGE biplot visualisation precisely identified IC559983 as the most stable genotype with a moderately resistant response, and TCADL 19–5 as a desirable genotype with a consistent resistant response across the tested locations. The genotypes identified in this study offer valuable resources for effective management of the blight complex, with the potential to enhance lentil productivity and contribute to food security.