ArticleArchives of microbiology2026
Control of anthracnose caused by Colletotrichum truncatum on dragon fruit (Hylocereus undatus) using recombinant chitinase.
Article in Archives of microbiology, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Anthracnose, caused by Colletotrichum spp., is a major postharvest disease affecting dragon fruit (Hylocereus undatus) in Vietnam. In this study, a fungal strain was isolated from infected dragon fruits and identified based on morphological characteristics and multi-locus phylogenetic analysis (ITS region, and ACT, CHS-1, CAL, GAPDH, TUB2 genes) as C. truncatum DH31.1. The antifungal activity of a thermostable mutant chitinase I168L, derived from 42 kDa chitinase of Trichoderma asperellum SH16, was evaluated against C. truncatum. In vitro assays demonstrated that 60 U of I168L inhibited fungal growth, resulting in a colony diameter of 2.4 cm after 7 d, compared to 3.1 cm when treated with the same concentration of the wild-type chitinase. In vivo tests on dragon fruit showed that I168L effectively suppressed fungal growth at both 28 °C and 35 °C. Application of I168L with 100 U prevented C. truncatum DH31.1 infection for up to 4 d, with lesion diameters of only 0.2 cm after 7 d. Furthermore, curative application of I168L on post-infection dragon fruits reduced lesion expansion to 0.48 cm within 3 d. These findings highlight the potential of the thermostable mutant chitinase I168L as a promising biocontrol agent for postharvest disease management in dragon fruit.
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