Among APETALA2 (AP2)-type plant specific transcription factor family, WRINKLED 1 (WRI1), has appeared to be a master gene transcriptionally regulating a set of carbon metabolism- and fatty acid synthesis (FAS)-related genes re sponsible for seed specific triacylglycerols (TAGs) storage in oil plants. B3 type transcription factors, such as ABI3 and FUS3, are known to be involved in seed development, such as seed storage protein synthesis and maturation. Based on the recent whole genome sequence data of castor bean ( Ricinus communis L.), putative WRI1 homologs ( Rc WRI1 , RcWRI 2) specifically expressed in castor bean seed have been identified by comparing organ specific expression pro files among seed development-related transcription factors, seed storage specific genes ( Ricin , RcOleosin ) and a set of FAS genes including genes for sucrose synthase ( RcSUS 2), biotin carboxyl carrier protein (a subunit of acetyl-CoA carboxylase, RcBCCP 2) and ketoacyl-acyl carrier protein synthase ( RcKAS 1). Immunoreactive signals with WRI1, FUS3 and ABI5-related polypeptides were also detected in seed specifically, consistent with the expression profiles of seed development-related genes. The WRI1 binding consensus sites, [CnTnG](n)(7)[CG], designated as the AW-box, were found at the promoter region of RcBCCP 2 and RcKAS 1. Thus, Rc WRI1 possibly play a pivotal role in seed spe cific TAGs storage during seed development by directly activating FAS -related genes.
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