The effect of heat stress on the growth and aggressiveness of Fusarium graminearum isolates
In order to explore the effect of heat stress on the growth and aggressiveness of Fusarium graminearum,we measured the mycelia growth,sporulation,spore germination,osmotic stress,aggressiveness and DON production of five heat-tolerant isolates and four heat-sensitive isolates at 25℃ and 30℃.The results showed that the mycelial growth was inhibited but the sporulation and spore germination were promoted at 30℃ for both heat-tolerant and-sensitive isolates.The high temperature(30℃)treatment reduced the inhibition caused by NaCl and CaCl2 osmotic stress to the growth of F.graminearum isolates,but showed no effect on the inhibition caused by KCl,Congo Red,SDS and H2O2 stress.Furthermore,the aggressiveness remained unchanged or decreased at 30℃ in most heat-tolerant isolates,while increased in most heat-sensitive isolates,and high temperature(30℃)had a certain promoting effect on the production of DON toxins in most isolates.This study provides a theoretical basis for the prevalence and forecasting of Fusarium head blight under climate change.
万方数据
维普
