Fig. 2 Expression of phenylalanine ammonia lyase (Fig. 2A) and chalcone synthase (Fig. 2B) in crown nodules of the soybean cultivars Alpha, Chippewa, Hardin, Hodgson 78, and Nod 1-3 from 10 to 59 d after emergence following inoculation with Bradyrhizobium japonicum strain UMR161