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. 2017 Aug 22;7:9042. doi: 10.1038/s41598-017-07995-y

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© The Author(s) 2017

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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Three independent SIX6 deletion strains cause less symptom development in cucumber. Fresh weight (±S.E.) and disease index (DI) of (A) cucumber, (B) melon and (C) watermelon plants were scored 14 days post inoculation. An ANOVA followed by a Tukey HSD test (p < 0.05) was performed to determine significance of the differences in the fresh weight measurements (significance categories shown with letters above the bars). Under the tested conditions (10⁶ spores/ml, 25 °C), three independent SIX6 deletion strains caused reduced symptoms in cucumber compared to wildtype (wt) and an ectopic transformant (SIX6 ect. #10). Knockout of the two other candidate virulence genes SIX9 and SMP1 did not have a significant effect on virulence. Under these conditions (25 °C), Forc causes only mild symptoms on watermelon.