CHI2 — Brassica juncea

Summary

BJUB06G21090S (CHI2, BjCHI2) on chromosome B06 of Indian mustard encodes a cytochrome P450 monooxygenase with heme and iron binding, oxidoreductase, and monooxygenase activities, and is annotated for brassinosteroid binding, secologanin synthase activity, and 7-deoxyloganate/7-deoxyloganin 7-hydroxylase activities. The gene is associated with brassinosteroid inactivation, metabolism, and homeostasis, and linked to dwarfism with reduced fertility, altered light response, and brassinolide-rescuable phenotypes. It is associated with plant height, leaf morphology, cell and hypocotyl elongation, seed size, male fertility, flowering time, photomorphogenesis, and plant growth. Associations also include responses to jasmonic acid and light stimulus, polar cell growth, and saponin, indole alkaloid, cholesterol, and steroid metabolism. The encoded protein localizes to the endoplasmic reticulum membrane. Studies of related genes in other species link the family to brassinosteroid catabolism and abiotic stress adaptation.