The CENH3-GFP reporter cassette driven by the different promotor sequences was constructed using the Multisite-Gateway cloning system according to manufacturer’s instructions (Invitrogen). Sequences of the primers used to clone the corresponding cDNA fragments are listed in Additional file 11: Table S2. Verified plasmids was transformed into the Agrobacterium tumefaciens strain GV3130 and used to generate transgenic Arabidopsis lines (ecotype Colombia-0) through floral dip methodology. Single T-DNA transgenic progeny plants were selected based on kanamycin resistance and stable GFP expression.
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