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<p>Leaf blight caused by <i>Alternaria alternata</i> is one of the most devastating diseases affecting Japanese mint, leading to a significant reduction in essential oil yield. Disease management through microbial consortium may enhance their efficacy, dependability and consistency even in various soil and environmental conditions. The present study focused on exploring potential rhizosphere microflora that are able to suppress the leaf blight disease in <i>Mentha.</i> A number of morphologically distinct fungal and bacteria isolates were obtained from rhizosphere of different medicinal plants. These isolates were screened in vitro for their antagonistic potential against <i>A. alternata</i>. The screening yielded two fungal isolates <i>viz. Trichoderma harzianum</i> MPTr3 and <i>Trichoderma hamatum</i> MPTr6 and three bacterial isolates i.e. <i>Alcaligene</i> sp. MPRB10, <i>Bacillus subtilis</i> MPRB11 and <i>Pseudomonas</i> sp. MPRB14 that showed promising result in reduction of the mycelial growth of the pathogen. Plant growth promotion and biocontrol attributes emphasized that <i>B. subtilis</i> MPRB11 recorded maximum indole acetic acid and cellulase production whereas, highest siderophore solubilization efficiency and chitinase production was recorded by <i>Pseudomonas</i> sp. MPRB14. <i>In planta</i> experiment demonstrated that combined application of the studied bioagents (<i>T. harzianum</i> MPTr3 + <i>T. hamatum</i> MPTr6 + <i>B. subtilis</i> MPRB11 + <i>Pseudomonas</i> sp. MPRB14) recorded significantly highest number of leaves, fresh and dry weight in <i>Mentha</i> compared to other treatments. The same combined application of these four bioagents was also found superior in reduction of leaf blight severity by recording the lowest percent disease index of 14.67%.</p>

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Exploring the efficacy of potential rhizosphere microflora against leaf blight disease in Japanese mint incited by Alternaria alternata

  • 期刊论文

  • 发表日期：

    2025年11月4日

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  • Anamita Sen,
  • Dinesh Rai,
  • M. S. Sai Reddy,
  • Aman Jaiswal,
  • Manoj Kumar Prajapati,
  • Anupam Kumari

摘要

Leaf blight caused by Alternaria alternata is one of the most devastating diseases affecting Japanese mint, leading to a significant reduction in essential oil yield. Disease management through microbial consortium may enhance their efficacy, dependability and consistency even in various soil and environmental conditions. The present study focused on exploring potential rhizosphere microflora that are able to suppress the leaf blight disease in Mentha. A number of morphologically distinct fungal and bacteria isolates were obtained from rhizosphere of different medicinal plants. These isolates were screened in vitro for their antagonistic potential against A. alternata. The screening yielded two fungal isolates viz. Trichoderma harzianum MPTr3 and Trichoderma hamatum MPTr6 and three bacterial isolates i.e. Alcaligene sp. MPRB10, Bacillus subtilis MPRB11 and Pseudomonas sp. MPRB14 that showed promising result in reduction of the mycelial growth of the pathogen. Plant growth promotion and biocontrol attributes emphasized that B. subtilis MPRB11 recorded maximum indole acetic acid and cellulase production whereas, highest siderophore solubilization efficiency and chitinase production was recorded by Pseudomonas sp. MPRB14. In planta experiment demonstrated that combined application of the studied bioagents (T. harzianum MPTr3 + T. hamatum MPTr6 + B. subtilis MPRB11 + Pseudomonas sp. MPRB14) recorded significantly highest number of leaves, fresh and dry weight in Mentha compared to other treatments. The same combined application of these four bioagents was also found superior in reduction of leaf blight severity by recording the lowest percent disease index of 14.67%.