Update publication information. The RDM15 genomic sequence was fused in frame to the 3xFLAG tag and 3xMYC tag, and the fused sequences were inserted into the pCambia1305 backbone and were transformed into Arabidopsis plants, respectively. A 5-g quantity of flower tissue was harvested from transgenic plants and ground in liquid nitrogen. The proteins were extracted in 25 mL of lysis buffer [50 mM Tris (pH 7.5), 150 mM NaCl, 5 mM MgCl2, 10% glycerol, 0.1% Nonidet P-40, 0.5 mM DTT, 1 mM PMSF, and 250 ul of plant cell protease inhibitor (Sigma)]. After the proteins were extracted, anti-Flag M2 (Sigma; F3165) or anti- Myc (Sigma; M5546) was added and incubated at 4 °C for 2–3 h. The resins were then washed with the lysis buffer at least five times. The protein samples were sent to the Core Facility for Proteomics at the Shanghai Center for Plant Stress Biology (PSC) for affinity purification and mass spectrometry.