3 years ago

RNAi as an emerging approach to control Fusarium Head Blight disease and mycotoxin contamination in cereals

Kim Hammond-Kosack, Ana Karla Machado, Kostya Kanyuka, Martin Urban, Neil Andrew Brown
Fusarium graminearum is a major fungal pathogen of cereals worldwide, causing seedling, stem base and floral diseases, including Fusarium Head Blight (FHB). In addition to yield and quality losses, FHB contaminates cereal grain with mycotoxins, including deoxynivalenol (DON), which are harmful to human, animal and ecosystem health. Currently FHB control is only partially effective due to several intractable problems. RNA interference (RNAi) is a natural mechanism that regulates gene expression. RNAi has been exploited in the development of new genomic tools, which allow the targeted silencing of genes of interest in many eukaryotes. Host-Induced Gene Silencing (HIGS) is a transgenic technology used to silence fungal genes in planta during attempted infection and thereby to reduce disease levels. HIGS relies on the host plant's ability to produce mobile small interfering RNA (siRNA) molecules, generated from long double stranded RNA (dsRNA), which are complementary to targeted fungal genes. These molecules are transferred from the plant into invading fungi via an uncharacterised mechanism, to cause gene silencing. Here, we describe recent advances in RNAi-mediated control of plant pathogenic fungi, highlighting the key advantages and disadvantages. We then discuss the developments and implications of combining HIGS with other methods of disease control.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/ps.4748

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