CASZ1 and infection: In previous research, it has been shown that legume mutants deficient in the Nod factor signalling pathway such as castor, ccamk and nup85 exhibit root hair branching in an infection- or Nod factor treatment-dependent manner (Imaizumi-Anraku et al. 2005; Miwa et al. 2006; Saito et al. 2007).