SAG12 — Brassica napus

Summary

BnSAG12 (SAG12) on chromosome C02 of oilseed rape (Brassica napus) encodes a papain-like cysteine peptidase, possessing cysteine-type peptidase activity and proteinase-activated receptor binding. The gene is associated with leaf senescence, floral organ senescence, and programmed cell death involved in cell development. It is associated with chlorophyll breakdown and downregulation of chlorophyll anabolism, as well as starch breakdown, sucrose transport, phloem loading, and nitrate import. Associations with agronomic traits include leaf chlorosis, drought resistance, flooding tolerance, seed yield, seed nitrogen content, and nitrogen remobilization. The encoded protein localises to the senescence-associated vacuole, lysosome, and protein storage vacuole. Studies of related genes in other species link the family to developmental senescence and cadmium-induced programmed cell death.