Plant materials and growth conditions
The A. thaliana mutant col13 (GK657F04-023194) in the Columbia background (Col-0) was bought from Germany (GABI-Kat, Max Planck Institute for Plant Breeding Research, Carl-von-Linné-Weg 10, 50829 Köln, Germany)(Rosso et al., 2003), while col3 was generously provided by Professor Magnus Holm(Datta et al., 2006). Col-0, Ws and their F1 hybrid were used as wild-type controls. Seed sterilization and growth were as previously described in our paper (B. Liu et al., 2016).