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<p>The common bean is a significant crop globally, commonly consumed as green pods or dried beans. Anthracnose infection negatively impacts the crop’s production. Two common bean accessions (INGR20026 and INGR20027) resistant to anthracnose were identified from the Garhwal Himalayas. This research attempted to evaluate these accessions’ resistance against eight <i>Colletotrichum lindemuthianum</i> strains obtained from bean cultivation regions in the Pauri and Tehri districts of the Garhwal Himalayas. The isolates were collected from the symptomatic common bean leaves and pods. The morphological and molecular diversity of collected isolates was studied, and their virulence capacity was analyzed by in-vitro disease screening using three resistant and one susceptible accession. The strains of <i>C. lindemuthianum</i> showed remarkable diversity, with total N, Na, Ne, He, I values of 1.48, 0.825, 0.825, 0.013, and 2.07, respectively, among isolates. On AMOVA analysis, 20% of the variance was found among populations, while 80% was within populations. Strains TA-1 and PA-4 demonstrated high levels of virulence compared to the other strains. Resistance reaction depends on the plant’s genotype and the virulence of the pathogen strain. Accession INGR20026 resisted all eight strains, whereas INGR20027 was resistant to five strains and moderately resistant to TA-1 and PA-4. These accessions can be used as fresh sources of anthracnose resistance in bean breeding programs to produce anthracnose-resistant varieties.</p>

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Reactions of common bean accessions (INGR20026 and INGR20027) to Colletotrichum lindemuthianum strains isolated from the Garhwal Himalayas

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Sargam Gupta,
  • Saumya Saha,
  • Deepti Prabha,
  • Navneeti Chamoli,
  • Yogesh Kumar Negi,
  • J. S. Chauhan

摘要

The common bean is a significant crop globally, commonly consumed as green pods or dried beans. Anthracnose infection negatively impacts the crop’s production. Two common bean accessions (INGR20026 and INGR20027) resistant to anthracnose were identified from the Garhwal Himalayas. This research attempted to evaluate these accessions’ resistance against eight Colletotrichum lindemuthianum strains obtained from bean cultivation regions in the Pauri and Tehri districts of the Garhwal Himalayas. The isolates were collected from the symptomatic common bean leaves and pods. The morphological and molecular diversity of collected isolates was studied, and their virulence capacity was analyzed by in-vitro disease screening using three resistant and one susceptible accession. The strains of C. lindemuthianum showed remarkable diversity, with total N, Na, Ne, He, I values of 1.48, 0.825, 0.825, 0.013, and 2.07, respectively, among isolates. On AMOVA analysis, 20% of the variance was found among populations, while 80% was within populations. Strains TA-1 and PA-4 demonstrated high levels of virulence compared to the other strains. Resistance reaction depends on the plant’s genotype and the virulence of the pathogen strain. Accession INGR20026 resisted all eight strains, whereas INGR20027 was resistant to five strains and moderately resistant to TA-1 and PA-4. These accessions can be used as fresh sources of anthracnose resistance in bean breeding programs to produce anthracnose-resistant varieties.