Citrus candidate reference gene description and comparison with Arabidopsis orthologs.

Eleven of the fifteen candidate citrus reference genes were selected according to their similarity to reference genes identified in Arabidopsis. Citrus sequences were retrieved from the citrus database (CitEST). Sequences used to design primer pairs for ADP-ribosylation factor (ADP), cathepsin (CtP) and cyclophilin (CYP) were retrieved from HarvEST Citrus according to Carvalho et al. (2010). aArabidopsis Gene Initiative (AGI) locus identifier number. bUnigene identifier according to CitEST database. Abbreviations: CS- Citrus sinensis; CR- C. reticulata; PT- Poncirus trifoliata.