单词	avirulent
释义	avirulent /eɪˈvɪrjʊl(ə)nt / /aˈvɪrjʊl(ə)nt/ adjective (Of a microorganism) not virulent.Concerning biotic stress, plants exposed to virulent and avirulent pathogens respond with a range of defence- and damage-limiting mechanisms.... The main common defence reaction is the hypersensitive response, characterized by the induction of rapid cell death at the site of the attempted attack by either an avirulent strain of a pathogen or a non-pathogen. In Arabidopsis plants infiltrated with avirulent bacteria, specific calcium ‘waves’ were found to occur concurrent with the oxidative burst, leading to the HR.
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