Mutation of the rice XA21 predicted nuclear localization sequence does not affect resistance to pv. .

Background: The rice receptor kinase XA21 confers robust resistance to the bacterial pathogen pv. (). We previously reported that XA21 is cleaved in transgenic plants overexpressing XA21 with a GFP tag (-XA21-GFP) and that the released C-terminal domain is localized to the nucleus.