A CLE19 genomic fragment containing a 1782bp 5′ upstream region (pCLE19), 225bp coding region, and a 1205bp 3′ downstream region (tCLE19) was amplified and cloned into pDONR201 (Invitrogen) to construct the pDONR201-pCLE19:CLE19:tCLE19 entry clone. To generate a glycine to threonine substitution (G6T) at the sixth amino acid (G6) of the CLE motif, a Fast Mutagenesis Kit (TransGen, Beijing) was used to introduce point mutations into pDONR201-pCLE19:CLE19:tCLE19 to produce pDONR201-pCLE19:CLE19G6T:tCLE19, which was then transferred to the pBGWFS7 binary vector to generate pCLE19:CLE19G6T:tCLE19. pCLE19 and tCLE19 were cloned into the ligation-independent cloning vectors pPLV04 and pPLV15 (De Rybel et al., 2011 (link)) to generate pCLE19:SV40-3XGFP:tCLE19 and pCLE19:GUS:tCLE19, respectively. pWOX1:SV40-3XGFP, pWOX3:SV40-3XGFP, and pALE1:SV40-3XGFP were made in a similar manner using pPLV04 (De Rybel et al., 2011 (link)). The pALE1:CLE19G6T construct was made by replacing the SV40-3XGFP cassette in pALE1:SV40-3XGFP with the CLE19G6T coding sequence.
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