Infection pockets (IPs) and infection threads (ITs) of WT, cngc15a GOF and cngc15c GOF 5 dpi with S. meliloti 2011:: lacZ. Data represent three biological replicates (n = 15). Two-tailed unpaired t -test with a previous F -test for homoscedasticity. IP (WT versus cngc15a GOF) P = 0.0015, IP (WT versus cngc15c GOF) P < 0.0001, IT (WT versus cngc15a GOF) P = 0.0002 and IT (WT versus cngc15c GOF) P = 0.0002.