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Research article2024Peer reviewedOpen access

Biocontrol potential of lipopeptides produced by the novel Bacillus altitudinis strain TM22A against postharvest Alternaria rot of tomato

Malik, Javaria; Moosa, Anam; Zulfiqar, Faisal; et al.


Bacillus genus exhibits antagonistic potential against a broad range of pathogenic fungi. This study presents the antifungal potential of lipopeptides (LPs) produced by a novel strain Bacillus altitudinis TM22A to suppress the infection of Alternaria rot on tomato. We investigated the antifungal effect of ten Bacillus species against Alternaria alternata, where four Bacillus strains TM22A, MCM61, S2, and CPCF54 exhibited antifungal activity. The LPs extracted from TM22A, MCM61, S2, and CPCF54 restricted mycelial growth and conidial germination of A. alternata in vitro with the highest inhibition produced by TM22A. Liquid chromatography and mass spectrometry (LC-MS) analysis revealed the presence of surfactin, fengycin, iturin, bacillibactin, and bacilysin in strain TM22A at 1036.69, 1435.76, 1085.58, 883.26, and 271.13 m/z respectively. In an In planta assay LPs from TM22A caused the lowest lesion diameter and disease incidence on tomato fruit. Furthermore, the defense enzymes viz, catalase (CAT), polyphenol oxidase (PPO), peroxidase (POD), superoxide dismutase (SOD), and phenylalanine ammonia-lyase (PAL) were enhanced in Bacillus LPs treated tomato fruit with the more pronounced impact in response to TM22A. Post-harvest quality analysis revealed little impact on ascorbic acid, fruit pH, total soluble solids (TSS), titratable acidity (TA), weight loss, and fruit firmness compared to healthy control. This is the first comprehensive study to reveal the antifungal effect of Bacillus-derived LPs against postharvest Alternaria rot of tomato and its role in defense elicitation to protect the fruit from pathogen invasion.

Published in

2024, Volume: 191, article number: 115541

    Associated SLU-program

    SLU Plant Protection Network

    Sustainable Development Goals

    SDG2 End hunger, achieve food security and improved nutrition and promote sustainable agriculture
    SDG12 Ensure sustainable consumption and production patterns

    UKÄ Subject classification

    Agricultural Science

    Publication identifier


    Permanent link to this page (URI)