tailieunhanh - báo cáo khoa học: "Brachypodium distachyon: a new pathosystem to study Fusarium head blight and other Fusarium diseases of wheat"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Brachypodium distachyon: a new pathosystem to study Fusarium head blight and other Fusarium diseases of wheat | Peraldi et al. BMC Plant Biology 2011 11 100 http 1471 -2229 11 100 BMC Plant Biology RESEARCH ARTICLE Open Access Brachypodium distachyon a new pathosystem to study Fusarium head blight and other Fusarium diseases of wheat Antoine Peraldi1 Giovanni Beccari2 Andrew Steed1 and Paul Nicholson1 Abstract Background Fusarium species cause Fusarium head blight FHB and other important diseases of cereals. The causal agents produce trichothecene mycotoxins such as deoxynivalenol DON . The dicotyledonous model species Arabidopsis thaliana has been used to study Fusarium-host interactions but it is not ideal for model-to-crop translation. Brachypodium distachyon Bd has been proposed as a new monocotyledonous model species for functional genomic studies in grass species. This study aims to assess the interaction between the most prevalent FHB-causing Fusarium species and Bd in order to develop and exploit Bd as a genetic model for FHB and other Fusarium diseases of wheat. Results The ability of Fusarium graminearum and Fusarium culmorum to infect a range of Bd tissues was examined in various bioassays which showed that both species can infect all Bd tissues examined including intact foliar tissues. DON accumulated in infected spike tissues at levels similar to those of infected wheat spikes. Histological studies revealed details of infection colonisation and host response and indicate that hair cells are important sites of infection. Susceptibility to Fusarium and DON was assessed in two Bd ecotypes and revealed variation in resistance between ecotypes. Conclusions Bd exhibits characteristics of susceptibility highly similar to those of wheat including susceptibility to spread of disease in the spikelets. Bd is the first reported plant species to allow successful infection on intact foliar tissues by FHB-causing Fusarium species. DON appears to function as a virulence factor in Bd as it does in wheat. Bd is proposed as a valuable model for undertaking .