The molecular mechanisms involved in the perception, signaling and response in plant-pathogen interactions are major elements in the study of true resistance or susceptibilit y. As yet, there is no clear idea on what is really happening during certain molecular events. Nevertheless, this new insight offers us the possible answers to many questions on this topic. In this review, we deal with the
... [Show full abstract] basic and new hypotheses on the biochemical and molecular mechanisms that are activated in the plant during its interaction with the pathogen.