The original PDF version of this Article contained an error where part of the sentence “Considering that the T3SS has been shown to bypass the requirement of NF signalling during the interactions of some Bradyrhizobium strains including ORS3257 with some tropical legumes15,16, we constructed a mutant in which the nodABC genes were deleted and analysed its symbiotic properties.” was incorrectly placed next to Figure 1. This error has now been corrected in the PDF version of the Article; the HTML version was correct from the time of publication. © 2021, The Author(s).