当前位置：
X-MOL 学术
›
Trop. Plant Pathol.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Genetic diversity of Fusarium meridionale, F. austroamericanum, and F. graminearum isolates associated with Fusarium head blight of wheat in Brazil
Tropical Plant Pathology ( IF 1.5 ) Pub Date : 2020-10-19 , DOI: 10.1007/s40858-020-00403-3 Marcia Helena Mota de Arruda , Felipe Liss Zchosnki , Yuri Kataoka Silva , Daniele Luciana de Lima , Dauri José Tessmann , Paulo Roberto Da-Silva
Tropical Plant Pathology ( IF 1.5 ) Pub Date : 2020-10-19 , DOI: 10.1007/s40858-020-00403-3 Marcia Helena Mota de Arruda , Felipe Liss Zchosnki , Yuri Kataoka Silva , Daniele Luciana de Lima , Dauri José Tessmann , Paulo Roberto Da-Silva
One of the biggest challenges of wheat production worldwide is to overcome fungal diseases, and among these is Fusarium head blight (FHB) caused mainly by the Fusarium graminearum species complex (FGSC). The occurrence of FHB can lead to contamination of grains with mycotoxins, which are harmful to human and animal health. In South America, in addition to F. graminearum sensu stricto (F. graminearum), which is the most common causal agent of FHB worldwide, F. meridionale and F. austroamericanum have also been found in wheat fields. Special attention should be paid to F. meridionale because it produces the trichothecene mycotoxin nivalenol, which has potentially higher levels of toxicity when compared with that of other trichothecene produced by the FGSC. Knowledge of the diversity and genetic structure of populations of pathogens can assist in understanding pathogen survival in the face of host genetic resistance, crop rotation, and management with fungicides. In this study, we used 10 inter-simple sequence repeat (ISSR) primers to estimate the variability, diversity, and genetic structure of populations of F. graminearum, F. meridionale, and F. austroamericanum co-occurring in wheat fields in Parana State, Brazil. The population of F. graminearum showed the greatest genetic variability according to its polymorphism (P = 86.61%), Nei’s genetic diversity (h = 0.28), and Shannon diversity (I = 0.43) indices as compared with that of the populations of F. meridionale (P = 75.89%, h = 0.23, I = 0.36) and F. austroamericanum (P = 67.86%, h = 0.22, I = 0.33). The dendrogram, principal coordinate analysis, Bayesian analysis (K = 4), and the differentiation index (GST = 0.27) showed very high structure and, consequently, high species differentiation. The overall analysis of our data indicates high variability and genetic structure of the studied populations. This genetic condition guarantees high resilience of these species and could make it difficult to obtain wheat cultivars with good resistance to FHB, as well as may cause chemical control to be less effective.
更新日期：2020-10-19
京公网安备 11010802027423号