TBF1, a master-switch between defense and growth, is down-regulated in F1 hybrids. A, Altered expression of TBF1 and genes regulated by TBF1 (block represents fold change ≥ ±1.2, P ≤ 0.01, FDR ≤ 0.01); The up or down symbol represents a trend for increased expression (red) or decreased expression (blue) in NahG (fold change ≥ ±1.5; Pajerowska-Mukhtar et al., 2012). B, TBF1 allelic expression in parents and hybrids. Parent columns represent haploid read numbers for each parent. F1 columns represent expression of either the C24 allele or the Ler allele in the F1 hybrid. TBF1 allelic expression values can be found in Supplemental Table S3. C, Genes repressed by TBF1 are up-regulated in F1 hybrids (fold change ≥ ±1.2, P ≤ 0.01, FDR ≤ 0.01). A more extensive list of photosynthetic genes repressed by TBF1 can be found in Supplemental Figure S7C.