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. 2023 Jan 11;6:27. doi: 10.1038/s42003-023-04417-w

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a GFP-tagged Foc TR4 cultured in PDB for 36 h and photographed. b The supernatant of S. morookaensis strain Sm4-1986 inhibits growth of Foc TR4. Strain Sm4-1986 was cultured in PDB for 10 days, and the supernatant of culture was collected and added to PDB (1:1, v/v), in which GFP-tagged Foc TR4 was cultured for 36 h and photographed. c Structure of xerucitrinin A. d Structure of 6-pentyl-α-pyrone. e Xerucitrinin A chelates iron assayed by Chrome Azurol Sulphonate (CAS). There is yellow zone around the Oxford cup in the center of the plate, indicating the iron-chelating ability. f 6-PP suppresses propagation of Foc TR4. Foc TR4 and 0.96 mM 6-PP-treated Foc TR4 were cultured in PDB, respectively, and the optical densities of the culture solution were monitored at the indicated time-points. Mean of triplicate and standard deviation were shown. g 6-PP treatment significantly reduces the number of Foc TR4 spores and completely inhibits Foc TR4 spore germination. Spores were counted using a Malassez hemocytometer at 24 h of cultivation. Mean of triplicate and standard deviation was shown. Scare bars in (a), and (b), 5 μm.