[No authors listed]
ROPs constitute a family of plant-specific, RHO-like small GTPases that serve as molecular switches in a wide range of signaling pathways. The activities of ROPs are regulated by guanine nucleotide exchange factors (GEFs). ROP11, a member of the ROP GTPase family in Arabidopsis, is a negative regulator of multiple ABA responses. In this study, we show that ROPGEF1 and ROPGEF4 interact with ROP11 on plasma membranes in guard cells. Furthermore, our analyses of ROPGEF1/4 knockout mutants and overexpressing lines suggested that ROPGEF1 and ROPGEF4 are specific regulators of ROP11 function in ABA-mediated stomatal closure.
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