Figure 1

Photos of Triphysaria haustoria with Arabidopsis host roots. A. Physical contact between parasite and host roots was made by laying Arabidopsis seedlings across the roots of T. versicolor seedlings in vitro. RNA for the host-induced library was isolated from the Triphysaria roots up to five hours after contact with Arabidopsis. B and C. Haustorium development on Triphysaria roots after 36 hours contact with Arabidopsis. C shows a single Triphysaria root forming haustoria on two different Arabidopsis roots. D. Haustorium development after 24 hrs exposure to 30 μM DMBQ.