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Genetic diversity of field Fusarium asiaticum and Fusarium graminearum isolates increases the risk of fungicide resistance

文献类型： 外文期刊

作者： Zhang, Ya-Zhou 1 ; Li, Zhuo 1 ; Man, Jie 1 ; Xu, Dan 1 ; Wen, Lan 1 ; Yang, Chen 1 ; Xu, Qiang 1 ; Jiang, Qian-Tao 1 ; Chen, Guo-Yue 1 ; Deng, Mei 1 ; Peng, Yun-Liang 3 ; Zhong, Kai 4 ; Qi, Peng-Fei 1 ; Wei, Yu-Ming 1 ;

作者机构： 1.Sichuan Agr Univ, State Key Lab Crop Gene Explorat & Utilizat Southw, Chengdu 611130, Peoples R China

2.Sichuan Agr Univ, Triticeae Res Inst, Chengdu 611130, Peoples R China

3.Sichuan Acad Agr Sci, Inst Plant Protect, Chengdu 610066, Peoples R China

4.Sichuan Univ, Coll Biomass Sci & Engn, Chengdu 610065, Peoples R China

关键词： Fusarium head blight; Virulence; Whole-genome sequencing; Genetic diversity; Fungicide

期刊名称：PHYTOPATHOLOGY RESEARCH （ 影响因子：3.4； 五年影响因子：4.2 ）

ISSN： 2096-5362

年卷期： 2023 年 5 卷 1 期

页码：

收录情况： SCI

摘要： Fusarium head blight (FHB) caused by Fusarium species, seriously threatens the safety of wheat (Triticum aestivum) production. Resistant cultivars and fungicides are frequently used to control these FHB pathogens. However, Fusarium species have been adapting the current FHB control approaches in a manner that raises concern for future FHB control strategies, which could lead to a greater risk of FHB outbreaks. In this study, a total of 521 strains of Fusarium were isolated from Sichuan province of China, to investigate the diversity of Fusarium species and the genes associated with their adaptation. Seven species were identified based on molecular markers and morphological analysis. The virulence assays showed that Fusarium asiaticum (Fa) and Fusarium graminearum (Fg) were the two major causal agents of FHB, with high virulence and more frequent isolates. Fungicide resistance analysis showed that four isolates had developed the resistance to carbendazim, and four isolates had developed the resistance to tebuconazole. Of note, two point-mutation variants (F200Y and E198Q) occurred in the beta 2-tubulin gene, leading to the carbendazim resistance. The landscape of genomic diversity was analyzed through whole-genome sequencing, revealing a total of 182,811 and 430,733 variants (including: single nucleotide polymorphisms, SNP, insertion and deletion, Indel, and structure variation, SV) among the Fa and Fg isolates, respectively. In addition, potential alterations in gene function (15.22%) were predicted among Fg variants. These alterations offer potential helps for the Fusarium species to adapt to various managements of FHB, which may increase risks in developing fungicide-resistant isolates. However, these annotated genetic variants are valuable resources for further genetic and genomic studies, as well as potential markers to assist disease risk assessment.

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