lˈæktuːkə sˌɛɹɪˈoʊlə ænd bˈiː. lˈæktuːkˌiː hæv ɐ dʒˈiːnfɔːɹdʒˈiːn ɹᵻlˈeɪʃənʃˌɪp, mˈiːnɪŋ ðæt ˈiːtʃ ɹᵻsˈɪstəns dʒˈiːn ɪnðə plˈænt ɪz ɐsˈoʊsɪˌeɪɾᵻd wɪð ɐ spəsˈɪfɪk dʒˈiːn ɪnðə pˈæθədʒən, wɪð ˈævɪɹələns bˌiːɪŋ dˈɑːmɪnənt tə vˈɪɹələns.
Lactuca serriola and B. lactucae have a gene-for-gene relationship, meaning that each resistance gene in the plant is associated with a specific gene in the pathogen, with avirulence being dominant to virulence.