Genome-Wide Comparative Analysis of Flowering-Related Genes in Arabidopsis, Wheat, and Barley

Table 4

Summary of the three public transcriptome datasets, genome characteristics, and numbers of expressed flowering genes of Arabidopsis, wheat, and barley.

	Arabidopsis	Wheat	Barley
Accession/cultivar	Columbia	Chinese Spring	Morex
Ploidy	Diploid ()	Hexaploid ()	Diploid ()
Genome size	135 Mb	17 Gb	5.3 Gb
Number of total predicted genes	27,416	9,8897	24,287
Number of genes on GeneChip	22,814	61,290	22,840
PLEXdb experiment ID	AT40	TA3	BB3
Number of tissues sampled	63	13	15
Number of predicted flowering genes	190	900	273
Number of flowering genes expressed (% of predicted flowering genes)	189 (99%)	676 (75%)	248 (91%)

Tissues of wheat include germinating seed (coleoptile, root, and embryo), seedling (root, crown, and leaf), immature inflorescence, floral organs before anthesis (bracts, pistils, and anthers), 3–5 DAP caryopsis, 22 DAP embryo, and 22 DAP endosperm; tissues of barley include germinating seed (coleoptile, root, and embryo), seedling (root, crown, and leaf), immature inflorescence, floral organs before anthesis (bracts, pistils, and anthers), 3–5 DAP caryopsis, 10 DAP caryopsis, 16 DAP caryopsis, 22 DAP embryo, and 22 DAP endosperm. See Supplemental file 5 for the normalized, log2-transformed expression values of the flowering genes in different organs or developmental stages.