IMMT and infection: The present results are consistent with previous findings; in the symbiosis between M. truncatula and S. meliloti, delayed infection was reported for high hmp expression in S. meliloti and for ectopic hmp expression and high Glb1.1 expression in the hairy roots of M. truncatula (del Giudice et al., 2011; Berger et al., 2020).