Fig. S1 Hierarchical clustering of barley gene expression experiments at Genevestigator 4. Analysis was carried out for conserved oligomeric Golgi (COG) subunit genes and genes of putative interaction partners of COG3. Gene IDs on barley 1 chips are: HvCOG1, Contig13332_at; HvCOG2, Contig11948_at; HvCOG3, Contig7930_at; HvCOG4, Contig11310_at; HvCOG5, Contig13262_at; HvCOG6, Contig10684_at; HvCOG7, Contig14245_at; HvCOG8, Contig9113_at; HvGOS1, Contig12134_at; HvYKT6, Contig8337_at; HvSEC22, Contig18727_at; HvVTI1, Contig9598_at; HvYPT1, Contig4865_s_at; HvCOPIg, Contig7764_at and/or Contig7765_at. Colour code shows log2 transformed changes in expression (from −2.5 to +2.5, i.e. from 18% to 566% of the expression level of the respective control).

Table S1 Protein sequence similarity scores for subunits of the human, Arabidopsis and barley conserved oligomeric Golgi (COG) complex.

Table S2 Accession/locus numbers of human and plant conserved oligomeric Golgi (COG) subunits.

Table S3 Interaction partners of conserved oligomeric Golgi 3 (COG3) identified in yeast by Suvorova et al. (2002) and their barley homologues.

Table S4 Oligo DNA primers for the isolation of vector-provided sequences for transient-induced gene silencing (TIGS) construct generation.

Table S5 Oligo DNA primers for isolation of cDNA fragments for transient-induced gene silencing (TIGS) construct generation.

Table S6 Oligo DNA primers for isolation of full-length cDNA sequences for over-expression constructs.

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