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<p>The present study aims to evaluate pathogenic variability among <i>Drechslera maydis</i> isolates, an incitant of maydis leaf blight (Southern leaf blight), across different maize-growing states of India. Pathogenic variation among five <i>D. maydis</i> isolates was assessed using ten maize genotypes under pot-house (protected) conditions. A substantial variation in virulence among five isolates was observed. Isolate Dm_1 (Ludhiana isolate) was found to be the most virulent with the shortest incubation period (5 days), maximum average per cent disease severity index (63.9%), maximum average number of lesions (11.1), and maximum melanin content (2.62&#xa0;µg/g) in all ten maize genotypes. Maize genotypes LM 13 and LM 14 exhibited the highest resistance, whereas the other genotypes were moderately to highly susceptible. These findings substantiate melanin’s role in fungal virulence. Furthermore, this study will help to develop breeding programs to manage this menace sustainably.</p>

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Pathogenic behavior of Drechslera maydis isolates on different maize inbred lines

  • 期刊论文

  • 发表日期：

    2026年3月21日

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  • Pravin Kumar Bagaria,
  • Vineet Kumar Sharma,
  • Harleen Kaur,
  • Karambir Singh Hooda,
  • Yogita Bohra,
  • Navdeep Singh

摘要

The present study aims to evaluate pathogenic variability among Drechslera maydis isolates, an incitant of maydis leaf blight (Southern leaf blight), across different maize-growing states of India. Pathogenic variation among five D. maydis isolates was assessed using ten maize genotypes under pot-house (protected) conditions. A substantial variation in virulence among five isolates was observed. Isolate Dm_1 (Ludhiana isolate) was found to be the most virulent with the shortest incubation period (5 days), maximum average per cent disease severity index (63.9%), maximum average number of lesions (11.1), and maximum melanin content (2.62 µg/g) in all ten maize genotypes. Maize genotypes LM 13 and LM 14 exhibited the highest resistance, whereas the other genotypes were moderately to highly susceptible. These findings substantiate melanin’s role in fungal virulence. Furthermore, this study will help to develop breeding programs to manage this menace sustainably.