Figure 4.47 Successful and aborted infection threads. a) A successful infection thread of compatible rhizobia on their host. Rhizobia are expressing the Green Fluorescent Protein. b) An aborted infection thread as a result of infection with a rhizobium strain unable to synthesise the correct exopolysaccharides, leading to a defence response. (Reproduced by permission from Macmillan Publishers Ltd from K.M. Jones et al. Nature Rev Microbiol 5: 619-633, 2007)