Fig. 4.

RSD is required to suppress immunity in nodules and act downstream of bacA. (Aa) Upon inoculation with the WT Sinorhizobium meliloti, the rsd-1 mutant nodules (32dpi) accumulate phenolics as revealed by methylene blue staining of nodules sections. (Ab) In contrast, bacA triggered nodules do not accumulate phenolics; scale bars represent 500 µm. (B) In agreement, RT-qPCR analyses indicate that defences are activated in rsd nodules induced by the WT bacteria but not in those triggered by the bacA mutant. (C) RSD expression is strongly reduced in dnf2 and symCRK mutant nodules. B, C: error bars represent standard errors.