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Int. J. Mol. Sci. 2018, 19(8), 2351; https://doi.org/10.3390/ijms19082351

Fusarium graminearum ATP-Binding Cassette Transporter Gene FgABCC9 Is Required for Its Transportation of Salicylic Acid, Fungicide Resistance, Mycelial Growth and Pathogenicity towards Wheat

Triticeae Research Institute, Sichuan Agricultural University, Chengdu 611130, China
These authors contributed equally to this work.
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Received: 7 July 2018 / Revised: 31 July 2018 / Accepted: 8 August 2018 / Published: 10 August 2018
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Abstract

ATP-binding cassette (ABC) transporters hydrolyze ATP to transport a wide range of substrates. Fusarium graminearum is a major causal agent of Fusarium head blight, which is a severe disease in wheat worldwide. FgABCC9 (FG05_07325) encodes an ABC-C (ABC transporter family C) transporter in F. graminearum, which was highly expressed during the infection in wheat and was up-regulated by the plant defense hormone salicylic acid (SA) and the fungicide tebuconazole. The predicted tertiary structure of the FgABCC9 protein was consistent with the schematic of the ABC exporter. Deletion of FgABCC9 resulted in decreased mycelial growth, increased sensitivity to SA and tebuconazole, reduced accumulation of deoxynivalenol (DON), and less pathogenicity towards wheat. Re-introduction of a functional FgABCC9 gene into ΔFgABCC9 recovered the phenotypes of the wild type strain. Transgenic expression of FgABCC9 in Arabidopsis thaliana increased the accumulation of SA in its leaves without activating SA signaling, which suggests that FgABCC9 functions as an SA exporter. Taken together, FgABCC9 encodes an ABC exporter, which is critical for fungal exportation of SA, response to tebuconazole, mycelial growth, and pathogenicity towards wheat. View Full-Text
Keywords: ABC transporter; SA; Fusarium head blight; mycotoxin ABC transporter; SA; Fusarium head blight; mycotoxin
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Qi, P.-F.; Zhang, Y.-Z.; Liu, C.-H.; Zhu, J.; Chen, Q.; Guo, Z.-R.; Wang, Y.; Xu, B.-J.; Zheng, T.; Jiang, Y.-F.; Wang, J.-P.; Zhou, C.-Y.; Feng, X.; Kong, L.; Lan, X.-J.; Jiang, Q.-T.; Wei, Y.-M.; Zheng, Y.-L. Fusarium graminearum ATP-Binding Cassette Transporter Gene FgABCC9 Is Required for Its Transportation of Salicylic Acid, Fungicide Resistance, Mycelial Growth and Pathogenicity towards Wheat. Int. J. Mol. Sci. 2018, 19, 2351.

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