PAP1 — Brassica napus

Summary

BnPAP1 (also known as PAP1-D, MYB90, MYB75) on chromosome C03 of oilseed rape encodes a Myb-domain transcription factor with DNA-binding, protein-dimerization, ubiquitin-ligase and protein-kinase activities. The gene is associated with regulation of flavonoid, proanthocyanidin and anthocyanin biosynthesis, pigment and mucilage anabolism, seed growth, petal development, trichome spacing, epidermal cell fate specification, and responses to UV-A, sucrose and dexamethasone. It localises to the nucleus, root hair, nuclear bodies and Cul4-RING E3 ubiquitin ligase complexes. Associations include flower and seed coat color, flavonoid content, seed longevity, root and leaf morphology, light sensitivity, nutrient responses, cadmium and iron concentration, lignin biosynthesis, and biotic stress tolerance. Studies of related genes in other species link the family to anthocyanin pigmentation, insect resistance, salt stress tolerance, phosphate deficiency tolerance, and root hair and trichome differentiation.