original_query: What is the role of mitogen-activated protein kinase (MAPK) in the resistance mechanism?
query: What is the role of mitogen-activated protein kinase (MAPK) in Arabidopsis thaliana's resistance mechanism against pathogens?
answer: In Arabidopsis thaliana, mitogen-activated protein kinase (MAPK) is speculated to play a role in the resistance mechanism induced by long-chain AHLs against biotrophic and hemibiotrophic pathogens by transducing external stimuli to extracellular responses.  However, further study is needed to clarify the precise mechanism.