Silencing of the Rac1 GTPase MtROP9 in Medicago truncatula stimulates early mycorrhizal and oomycete root colonizations but negatively affects rhizobial infection. - Kiirika LM; Bergmann HF; Schikowsky C; Wimmer D; Korte J; Schmitz U; Niehaus K; Colditz F (Plant physiology, 2012)