Figure S1 Re-analysis of the foxtail millet SiCKX2 gene prediction.

Figure S2 Alignment of the fully sequenced EST clone TaE5040F02 (TaCKX2.3, JF293079) with TaCKX2.1 (FJ648070) and TaCKX2.2 (GU084177) cDNAs.

Figure S3 Alignment of rice, wheat and barley cytokinin oxidase/dehydrogenases 2 proteins.

Figure S4 Phylogenetic analysis of Poaceae cytokinin oxidase/dehydrogenases proteins based on separate protein alignments of the FAD and cytokinin domains.

Table S1 Genomic barley cytokinin oxidase/dehydrogenases sequences generated.

Table S2Cytokinin oxidase/dehydrogenases homologues identified by BLASTn interrogation of TIGR wheat and barley Transcript Assemblies.

Table S3 Primers and further information for the genetic mapping of barley cytokinin oxidase/dehydrogenases genes.

Table S4 Micro-colinearity around cytokinin oxidase/dehydrogenases genes in sequenced grass species.

Table S5 Number of colinear genes identified between the cytokinin oxidase/dehydrogenases 2 regions of sequenced cereal species.

Table S6 Wheat and barley cytokinin oxidase/dehydrogenases 2 sequencing primers.

Table S7 Details of SNPs used to map cytokinin oxidase/dehydrogenases 2 genes in wheat.

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