Since the 1990’s, metalaxyl resistance of the late blight causing oomycete Phytophthora infestans have been continually reported in many potato producing countries, bringing the attention of the scientific community worldwide. Scientists have tried to understand how Phytophthora infestans and other pathogens acquire resistance to such powerful chemicals. Based on scientific research, several theories on fungicide resistance have been proposed, although none seems to be conclusive. In a recent study, researchers from the Biotechnological Research Center at ESPOL Polytechnic in Ecuador gave a step forward on this topic.
The research team shows evidence that membrane impermeabilization (the process of making something, such as a membrane or cell wall, permeable) might be occurring in resistant isolates of Phytophthora infestans, making it difficult for the fungicide to enter the pathogen.
These findings are described in the article entitled GC-MS metabolite profiling of Phytophthora infestans resistant to metalaxyl, published in the European Journal of Plant Pathology. Read more