ArticleCurrent microbiology2026
Sporicidal and Anti-germinative Effects of Achyrocline satureioides Extract on Paenibacillus larvae: A Potential Natural Strategy for American Foulbrood Control.
Article in Current 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
American Foulbrood (AFB) is a severe bacterial disease that affects honeybee larvae, caused by Paenibacillus larvae. The present study aimed to evaluate the sporulation ability of four P. larvae strains. Subsequently, the potential of the hexanic extract (HE) of Achyrocline satureioides to prevent germination or inactivate spores was studied. Spores from all strains were exposed to increasing concentrations of HE. The HE showed a strain-dependent inhibitory effect, reducing spore viability and, at higher concentrations, preventing spore germination. Some strains were highly susceptible, showing spore inactivation at all HE concentrations tested. The Minimum Inhibitory Concentration of Gemination and the Minimum Sporicidal Concentration ranged from 6.24 to 31.25 µg/ml and from 150 to 350 µg/ml, respectively. Transmission Electron Microscopy revealed structural disruptions in treated spores and Scanning Electron Microscopy showed spores surrounded by HE particles. Considering these results, A. satureioides extract appears to be a promising candidate for preventing P. larvae spore germination, a key step to avoid AFB development.
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