Figure 2

Genes of the circadian oscillator in Arabidopsis thaliana and homologs in other plant species discussed in this review. Ostreococcus tauri contains single homologs of CCA1 and TOC1, respectively [71]. The PRR ortholog PPD, most similar to PRR7, in Hordeum vulgare (PPDH1) [72] and Triticum aestivum (PPDA1, PPDB1 and PPDD1, designated after the location they derive from) [73] is important for flowering time control. The PRR7-like BvBTC1 in beet (Beta vulgaris) regulates bolting time [74]. Hordeum vulgare contains an ELF3 ortholog, EAM8 [75]. Brassica rapa retains a suite of clock genes after polyploidization and subsequent gene loss [80].