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The REproductive Meristem (REM) gene family encodes for transcription factors belonging to the B3 DNA binding domain superfamily. In  Arabidopsis thaliana , the  REM  gene family is composed of 45 members, preferentially expressed during flower, ovule, and seed developments. Only a few members of this family have been functionally characterized:  VERNALIZATION1  ( VRN1 ) and, most recently,  TARGET OF FLC AND SVP1  ( TFS1 ) regulate flowering time and  VERDANDI  ( VDD ), together with  VALKYRIE  ( VAL ) that control the death of the receptive synergid cell in the female gametophyte. We investigated the role of  REM34 ,  REM35 , and  REM36 , three closely related and linked genes similarly expressed in both female and male gametophytes. Simultaneous silencing by RNA interference (RNAi) caused about 50% of the ovules to remain unfertilized. Careful evaluation of both ovule and pollen developments showed that this partial sterility of the transgenic RNAi lines was due to a postmeiotic block in both female and male gametophytes. Furthermore, protein interaction assays revealed that REM34 and REM35 interact, which suggests that they work together during the first stages of gametogenesis.

REM34 and REM35 Control Female and Male Gametophyte Development in Arabidopsis thaliana