Function
Promotes anthocyanin accumulation through interaction with PHYA, especially in response to far-red light, high light and sucrose treatment, probably by triggering A3G2XYLT/UF3GT expression (PubMed:21395597, PubMed:27143545). Required for gametophytes development as well as male-female gamete recognition during fertilization, possibly by regulating mitochondrial gene expression (PubMed:21123745). Represses PHYA-mediated PIF3 phosphorylation (PubMed:27143545).